From ace9bad4df2684f31cbfe8c4ce7a0f5d92b27925 Mon Sep 17 00:00:00 2001
From: Mark Rutland <mark.rutland@arm.com>
Date: Tue, 4 Sep 2018 11:48:25 +0100
Subject: locking/atomics: Add common header generation files

To minimize repetition, to allow for future rework, and to ensure
regularity of the various atomic APIs, we'd like to automatically
generate (the bulk of) a number of headers related to atomics.

This patch adds the infrastructure to do so, leaving actual conversion
of headers to subsequent patches. This infrastructure consists of:

* atomics.tbl - a table describing the functions in the atomics API,
  with names, prototypes, and metadata describing the variants that
  exist (e.g fetch/return, acquire/release/relaxed). Note that the
  return type is dependent on the particular variant.

* atomic-tbl.sh - a library of routines useful for dealing with
  atomics.tbl (e.g. querying which variants exist, or generating
  argument/parameter lists for a given function variant).

* gen-atomic-fallback.sh - a script which generates a header of
  fallbacks, covering cases where architecture omit certain functions
  (e.g. omitting relaxed variants).

* gen-atomic-long.sh - a script which generates wrappers providing the
  atomic_long API atomic of the relevant atomic or atomic64 API,
  ensuring the APIs are consistent.

* gen-atomic-instrumented.sh - a script which generates atomic* wrappers
  atop of arch_atomic* functions, with automatically generated KASAN
  instrumentation.

* fallbacks/* - a set of fallback implementations for atomics, which
  should be used when no implementation of a given atomic is provided.
  These are used by gen-atomic-fallback.sh to generate fallbacks, and
  these are also used by other scripts to determine the set of optional
  atomics (as required to generate preprocessor guards correctly).

  Fallbacks may use the following variables:

  ${atomic}     atomic prefix: atomic/atomic64/atomic_long, which can be
		used to derive the atomic type, and to prefix functions

  ${int}        integer type: int/s64/long

  ${pfx}        variant prefix, e.g. fetch_

  ${name}       base function name, e.g. add

  ${sfx}        variant suffix, e.g. _return

  ${order}      order suffix, e.g. _relaxed

  ${atomicname} full name, e.g. atomic64_fetch_add_relaxed

  ${ret}        return type of the function, e.g. void

  ${retstmt}    a return statement (with a trailing space), unless the
                variant returns void

  ${params}     parameter list for the function declaration, e.g.
                "int i, atomic_t *v"

  ${args}       argument list for invoking the function, e.g. "i, v"

  ... for clarity, ${ret}, ${retstmt}, ${params}, and ${args} are
  open-coded for fallbacks where these do not vary, or are critical to
  understanding the logic of the fallback.

The MAINTAINERS entry for the atomic infrastructure is updated to cover
the new scripts.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com
Cc: Will Deacon <will.deacon@arm.com>
Cc: linuxdrivers@attotech.com
Cc: dvyukov@google.com
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: arnd@arndb.de
Cc: aryabinin@virtuozzo.com
Cc: glider@google.com
Link: http://lkml.kernel.org/r/20180904104830.2975-2-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 scripts/atomic/atomic-tbl.sh                 | 186 +++++++++++++++++++++++++++
 scripts/atomic/atomics.tbl                   |  41 ++++++
 scripts/atomic/fallbacks/acquire             |   9 ++
 scripts/atomic/fallbacks/add_negative        |  16 +++
 scripts/atomic/fallbacks/add_unless          |  16 +++
 scripts/atomic/fallbacks/andnot              |   7 +
 scripts/atomic/fallbacks/dec                 |   7 +
 scripts/atomic/fallbacks/dec_and_test        |  15 +++
 scripts/atomic/fallbacks/dec_if_positive     |  15 +++
 scripts/atomic/fallbacks/dec_unless_positive |  14 ++
 scripts/atomic/fallbacks/fence               |  11 ++
 scripts/atomic/fallbacks/fetch_add_unless    |  23 ++++
 scripts/atomic/fallbacks/inc                 |   7 +
 scripts/atomic/fallbacks/inc_and_test        |  15 +++
 scripts/atomic/fallbacks/inc_not_zero        |  14 ++
 scripts/atomic/fallbacks/inc_unless_negative |  14 ++
 scripts/atomic/fallbacks/read_acquire        |   7 +
 scripts/atomic/fallbacks/release             |   8 ++
 scripts/atomic/fallbacks/set_release         |   7 +
 scripts/atomic/fallbacks/sub_and_test        |  16 +++
 scripts/atomic/fallbacks/try_cmpxchg         |  11 ++
 scripts/atomic/gen-atomic-fallback.sh        | 181 ++++++++++++++++++++++++++
 scripts/atomic/gen-atomic-instrumented.sh    | 182 ++++++++++++++++++++++++++
 scripts/atomic/gen-atomic-long.sh            | 101 +++++++++++++++
 24 files changed, 923 insertions(+)
 create mode 100644 scripts/atomic/atomic-tbl.sh
 create mode 100644 scripts/atomic/atomics.tbl
 create mode 100644 scripts/atomic/fallbacks/acquire
 create mode 100644 scripts/atomic/fallbacks/add_negative
 create mode 100644 scripts/atomic/fallbacks/add_unless
 create mode 100644 scripts/atomic/fallbacks/andnot
 create mode 100644 scripts/atomic/fallbacks/dec
 create mode 100644 scripts/atomic/fallbacks/dec_and_test
 create mode 100644 scripts/atomic/fallbacks/dec_if_positive
 create mode 100644 scripts/atomic/fallbacks/dec_unless_positive
 create mode 100644 scripts/atomic/fallbacks/fence
 create mode 100644 scripts/atomic/fallbacks/fetch_add_unless
 create mode 100644 scripts/atomic/fallbacks/inc
 create mode 100644 scripts/atomic/fallbacks/inc_and_test
 create mode 100644 scripts/atomic/fallbacks/inc_not_zero
 create mode 100644 scripts/atomic/fallbacks/inc_unless_negative
 create mode 100644 scripts/atomic/fallbacks/read_acquire
 create mode 100644 scripts/atomic/fallbacks/release
 create mode 100644 scripts/atomic/fallbacks/set_release
 create mode 100644 scripts/atomic/fallbacks/sub_and_test
 create mode 100644 scripts/atomic/fallbacks/try_cmpxchg
 create mode 100644 scripts/atomic/gen-atomic-fallback.sh
 create mode 100644 scripts/atomic/gen-atomic-instrumented.sh
 create mode 100644 scripts/atomic/gen-atomic-long.sh

(limited to 'scripts')

diff --git a/scripts/atomic/atomic-tbl.sh b/scripts/atomic/atomic-tbl.sh
new file mode 100644
index 000000000000..9d6be538a987
--- /dev/null
+++ b/scripts/atomic/atomic-tbl.sh
@@ -0,0 +1,186 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# helpers for dealing with atomics.tbl
+
+#meta_in(meta, match)
+meta_in()
+{
+	case "$1" in
+	[$2]) return 0;;
+	esac
+
+	return 1
+}
+
+#meta_has_ret(meta)
+meta_has_ret()
+{
+	meta_in "$1" "bBiIfFlR"
+}
+
+#meta_has_acquire(meta)
+meta_has_acquire()
+{
+	meta_in "$1" "BFIlR"
+}
+
+#meta_has_release(meta)
+meta_has_release()
+{
+	meta_in "$1" "BFIRs"
+}
+
+#meta_has_relaxed(meta)
+meta_has_relaxed()
+{
+	meta_in "$1" "BFIR"
+}
+
+#find_fallback_template(pfx, name, sfx, order)
+find_fallback_template()
+{
+	local pfx="$1"; shift
+	local name="$1"; shift
+	local sfx="$1"; shift
+	local order="$1"; shift
+
+	local base=""
+	local file=""
+
+	# We may have fallbacks for a specific case (e.g. read_acquire()), or
+	# an entire class, e.g. *inc*().
+	#
+	# Start at the most specific, and fall back to the most general. Once
+	# we find a specific fallback, don't bother looking for more.
+	for base in "${pfx}${name}${sfx}${order}" "${name}"; do
+		file="${ATOMICDIR}/fallbacks/${base}"
+
+		if [ -f "${file}" ]; then
+			printf "${file}"
+			break
+		fi
+	done
+}
+
+#gen_ret_type(meta, int)
+gen_ret_type() {
+	local meta="$1"; shift
+	local int="$1"; shift
+
+	case "${meta}" in
+	[sv]) printf "void";;
+	[bB]) printf "bool";;
+	[aiIfFlR]) printf "${int}";;
+	esac
+}
+
+#gen_ret_stmt(meta)
+gen_ret_stmt()
+{
+	if meta_has_ret "${meta}"; then
+		printf "return ";
+	fi
+}
+
+# gen_param_name(arg)
+gen_param_name()
+{
+	# strip off the leading 'c' for 'cv'
+	local name="${1#c}"
+	printf "${name#*:}"
+}
+
+# gen_param_type(arg, int, atomic)
+gen_param_type()
+{
+	local type="${1%%:*}"; shift
+	local int="$1"; shift
+	local atomic="$1"; shift
+
+	case "${type}" in
+	i) type="${int} ";;
+	p) type="${int} *";;
+	v) type="${atomic}_t *";;
+	cv) type="const ${atomic}_t *";;
+	esac
+
+	printf "${type}"
+}
+
+#gen_param(arg, int, atomic)
+gen_param()
+{
+	local arg="$1"; shift
+	local int="$1"; shift
+	local atomic="$1"; shift
+	local name="$(gen_param_name "${arg}")"
+	local type="$(gen_param_type "${arg}" "${int}" "${atomic}")"
+
+	printf "${type}${name}"
+}
+
+#gen_params(int, atomic, arg...)
+gen_params()
+{
+	local int="$1"; shift
+	local atomic="$1"; shift
+
+	while [ "$#" -gt 0 ]; do
+		gen_param "$1" "${int}" "${atomic}"
+		[ "$#" -gt 1 ] && printf ", "
+		shift;
+	done
+}
+
+#gen_args(arg...)
+gen_args()
+{
+	while [ "$#" -gt 0 ]; do
+		printf "$(gen_param_name "$1")"
+		[ "$#" -gt 1 ] && printf ", "
+		shift;
+	done
+}
+
+#gen_proto_order_variants(meta, pfx, name, sfx, ...)
+gen_proto_order_variants()
+{
+	local meta="$1"; shift
+	local pfx="$1"; shift
+	local name="$1"; shift
+	local sfx="$1"; shift
+
+	gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
+
+	if meta_has_acquire "${meta}"; then
+		gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
+	fi
+	if meta_has_release "${meta}"; then
+		gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
+	fi
+	if meta_has_relaxed "${meta}"; then
+		gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
+	fi
+}
+
+#gen_proto_variants(meta, name, ...)
+gen_proto_variants()
+{
+	local meta="$1"; shift
+	local name="$1"; shift
+	local pfx=""
+	local sfx=""
+
+	meta_in "${meta}" "fF" && pfx="fetch_"
+	meta_in "${meta}" "R" && sfx="_return"
+
+	gen_proto_order_variants "${meta}" "${pfx}" "${name}" "${sfx}" "$@"
+}
+
+#gen_proto(meta, ...)
+gen_proto() {
+	local meta="$1"; shift
+	for m in $(echo "${meta}" | fold -w1); do
+		gen_proto_variants "${m}" "$@"
+	done
+}
diff --git a/scripts/atomic/atomics.tbl b/scripts/atomic/atomics.tbl
new file mode 100644
index 000000000000..fbee2f6190d9
--- /dev/null
+++ b/scripts/atomic/atomics.tbl
@@ -0,0 +1,41 @@
+# name	meta	args...
+#
+# Where meta contains a string of variants to generate.
+# Upper-case implies _{acquire,release,relaxed} variants.
+# Valid meta values are:
+# * B/b	- bool: returns bool
+# * v	- void: returns void
+# * I/i	- int: returns base type
+# * R	- return: returns base type (has _return variants)
+# * F/f	- fetch: returns base type (has fetch_ variants)
+# * l	- load: returns base type (has _acquire order variant)
+# * s	- store: returns void (has _release order variant)
+#
+# Where args contains list of type[:name], where type is:
+# * cv	- const pointer to atomic base type (atomic_t/atomic64_t/atomic_long_t)
+# * v	- pointer to atomic base type (atomic_t/atomic64_t/atomic_long_t)
+# * i	- base type (int/s64/long)
+# * p	- pointer to base type (int/s64/long)
+#
+read			l	cv
+set			s	v	i
+add			vRF	i	v
+sub			vRF	i	v
+inc			vRF	v
+dec			vRF	v
+and			vF	i	v
+andnot			vF	i	v
+or			vF	i	v
+xor			vF	i	v
+xchg			I	v	i
+cmpxchg			I	v	i:old	i:new
+try_cmpxchg		B	v	p:old	i:new
+sub_and_test		b	i	v
+dec_and_test		b	v
+inc_and_test		b	v
+add_negative		b	i	v
+add_unless		fb	v	i:a	i:u
+inc_not_zero		b	v
+inc_unless_negative	b	v
+dec_unless_positive	b	v
+dec_if_positive		i	v
diff --git a/scripts/atomic/fallbacks/acquire b/scripts/atomic/fallbacks/acquire
new file mode 100644
index 000000000000..e38871e64db6
--- /dev/null
+++ b/scripts/atomic/fallbacks/acquire
@@ -0,0 +1,9 @@
+cat <<EOF
+static inline ${ret}
+${atomic}_${pfx}${name}${sfx}_acquire(${params})
+{
+	${ret} ret = ${atomic}_${pfx}${name}${sfx}_relaxed(${args});
+	__atomic_acquire_fence();
+	return ret;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/add_negative b/scripts/atomic/fallbacks/add_negative
new file mode 100644
index 000000000000..e6f4815637de
--- /dev/null
+++ b/scripts/atomic/fallbacks/add_negative
@@ -0,0 +1,16 @@
+cat <<EOF
+/**
+ * ${atomic}_add_negative - add and test if negative
+ * @i: integer value to add
+ * @v: pointer of type ${atomic}_t
+ *
+ * Atomically adds @i to @v and returns true
+ * if the result is negative, or false when
+ * result is greater than or equal to zero.
+ */
+static inline bool
+${atomic}_add_negative(${int} i, ${atomic}_t *v)
+{
+	return ${atomic}_add_return(i, v) < 0;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/add_unless b/scripts/atomic/fallbacks/add_unless
new file mode 100644
index 000000000000..792533885fbf
--- /dev/null
+++ b/scripts/atomic/fallbacks/add_unless
@@ -0,0 +1,16 @@
+cat << EOF
+/**
+ * ${atomic}_add_unless - add unless the number is already a given value
+ * @v: pointer of type ${atomic}_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, if @v was not already @u.
+ * Returns true if the addition was done.
+ */
+static inline bool
+${atomic}_add_unless(${atomic}_t *v, ${int} a, ${int} u)
+{
+	return ${atomic}_fetch_add_unless(v, a, u) != u;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/andnot b/scripts/atomic/fallbacks/andnot
new file mode 100644
index 000000000000..9f3a3216b5e3
--- /dev/null
+++ b/scripts/atomic/fallbacks/andnot
@@ -0,0 +1,7 @@
+cat <<EOF
+static inline ${ret}
+${atomic}_${pfx}andnot${sfx}${order}(${int} i, ${atomic}_t *v)
+{
+	${retstmt}${atomic}_${pfx}and${sfx}${order}(~i, v);
+}
+EOF
diff --git a/scripts/atomic/fallbacks/dec b/scripts/atomic/fallbacks/dec
new file mode 100644
index 000000000000..10bbc82be31d
--- /dev/null
+++ b/scripts/atomic/fallbacks/dec
@@ -0,0 +1,7 @@
+cat <<EOF
+static inline ${ret}
+${atomic}_${pfx}dec${sfx}${order}(${atomic}_t *v)
+{
+	${retstmt}${atomic}_${pfx}sub${sfx}${order}(1, v);
+}
+EOF
diff --git a/scripts/atomic/fallbacks/dec_and_test b/scripts/atomic/fallbacks/dec_and_test
new file mode 100644
index 000000000000..0ce7103b3df2
--- /dev/null
+++ b/scripts/atomic/fallbacks/dec_and_test
@@ -0,0 +1,15 @@
+cat <<EOF
+/**
+ * ${atomic}_dec_and_test - decrement and test
+ * @v: pointer of type ${atomic}_t
+ *
+ * Atomically decrements @v by 1 and
+ * returns true if the result is 0, or false for all other
+ * cases.
+ */
+static inline bool
+${atomic}_dec_and_test(${atomic}_t *v)
+{
+	return ${atomic}_dec_return(v) == 0;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/dec_if_positive b/scripts/atomic/fallbacks/dec_if_positive
new file mode 100644
index 000000000000..c52eacec43c8
--- /dev/null
+++ b/scripts/atomic/fallbacks/dec_if_positive
@@ -0,0 +1,15 @@
+cat <<EOF
+static inline ${ret}
+${atomic}_dec_if_positive(${atomic}_t *v)
+{
+	${int} dec, c = ${atomic}_read(v);
+
+	do {
+		dec = c - 1;
+		if (unlikely(dec < 0))
+			break;
+	} while (!${atomic}_try_cmpxchg(v, &c, dec));
+
+	return dec;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/dec_unless_positive b/scripts/atomic/fallbacks/dec_unless_positive
new file mode 100644
index 000000000000..8a2578f14268
--- /dev/null
+++ b/scripts/atomic/fallbacks/dec_unless_positive
@@ -0,0 +1,14 @@
+cat <<EOF
+static inline bool
+${atomic}_dec_unless_positive(${atomic}_t *v)
+{
+	${int} c = ${atomic}_read(v);
+
+	do {
+		if (unlikely(c > 0))
+			return false;
+	} while (!${atomic}_try_cmpxchg(v, &c, c - 1));
+
+	return true;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/fence b/scripts/atomic/fallbacks/fence
new file mode 100644
index 000000000000..82f68fa6931a
--- /dev/null
+++ b/scripts/atomic/fallbacks/fence
@@ -0,0 +1,11 @@
+cat <<EOF
+static inline ${ret}
+${atomic}_${pfx}${name}${sfx}(${params})
+{
+	${ret} ret;
+	__atomic_pre_full_fence();
+	ret = ${atomic}_${pfx}${name}${sfx}_relaxed(${args});
+	__atomic_post_full_fence();
+	return ret;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/fetch_add_unless b/scripts/atomic/fallbacks/fetch_add_unless
new file mode 100644
index 000000000000..d2c091db7eae
--- /dev/null
+++ b/scripts/atomic/fallbacks/fetch_add_unless
@@ -0,0 +1,23 @@
+cat << EOF
+/**
+ * ${atomic}_fetch_add_unless - add unless the number is already a given value
+ * @v: pointer of type ${atomic}_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as @v was not already @u.
+ * Returns original value of @v
+ */
+static inline ${int}
+${atomic}_fetch_add_unless(${atomic}_t *v, ${int} a, ${int} u)
+{
+	${int} c = ${atomic}_read(v);
+
+	do {
+		if (unlikely(c == u))
+			break;
+	} while (!${atomic}_try_cmpxchg(v, &c, c + a));
+
+	return c;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/inc b/scripts/atomic/fallbacks/inc
new file mode 100644
index 000000000000..f866b3ad2353
--- /dev/null
+++ b/scripts/atomic/fallbacks/inc
@@ -0,0 +1,7 @@
+cat <<EOF
+static inline ${ret}
+${atomic}_${pfx}inc${sfx}${order}(${atomic}_t *v)
+{
+	${retstmt}${atomic}_${pfx}add${sfx}${order}(1, v);
+}
+EOF
diff --git a/scripts/atomic/fallbacks/inc_and_test b/scripts/atomic/fallbacks/inc_and_test
new file mode 100644
index 000000000000..4e2068869f7e
--- /dev/null
+++ b/scripts/atomic/fallbacks/inc_and_test
@@ -0,0 +1,15 @@
+cat <<EOF
+/**
+ * ${atomic}_inc_and_test - increment and test
+ * @v: pointer of type ${atomic}_t
+ *
+ * Atomically increments @v by 1
+ * and returns true if the result is zero, or false for all
+ * other cases.
+ */
+static inline bool
+${atomic}_inc_and_test(${atomic}_t *v)
+{
+	return ${atomic}_inc_return(v) == 0;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/inc_not_zero b/scripts/atomic/fallbacks/inc_not_zero
new file mode 100644
index 000000000000..a7c45c8d107c
--- /dev/null
+++ b/scripts/atomic/fallbacks/inc_not_zero
@@ -0,0 +1,14 @@
+cat <<EOF
+/**
+ * ${atomic}_inc_not_zero - increment unless the number is zero
+ * @v: pointer of type ${atomic}_t
+ *
+ * Atomically increments @v by 1, if @v is non-zero.
+ * Returns true if the increment was done.
+ */
+static inline bool
+${atomic}_inc_not_zero(${atomic}_t *v)
+{
+	return ${atomic}_add_unless(v, 1, 0);
+}
+EOF
diff --git a/scripts/atomic/fallbacks/inc_unless_negative b/scripts/atomic/fallbacks/inc_unless_negative
new file mode 100644
index 000000000000..0c266e71dbd4
--- /dev/null
+++ b/scripts/atomic/fallbacks/inc_unless_negative
@@ -0,0 +1,14 @@
+cat <<EOF
+static inline bool
+${atomic}_inc_unless_negative(${atomic}_t *v)
+{
+	${int} c = ${atomic}_read(v);
+
+	do {
+		if (unlikely(c < 0))
+			return false;
+	} while (!${atomic}_try_cmpxchg(v, &c, c + 1));
+
+	return true;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/read_acquire b/scripts/atomic/fallbacks/read_acquire
new file mode 100644
index 000000000000..75863b5203f7
--- /dev/null
+++ b/scripts/atomic/fallbacks/read_acquire
@@ -0,0 +1,7 @@
+cat <<EOF
+static inline ${ret}
+${atomic}_read_acquire(const ${atomic}_t *v)
+{
+	return smp_load_acquire(&(v)->counter);
+}
+EOF
diff --git a/scripts/atomic/fallbacks/release b/scripts/atomic/fallbacks/release
new file mode 100644
index 000000000000..3f628a3802d9
--- /dev/null
+++ b/scripts/atomic/fallbacks/release
@@ -0,0 +1,8 @@
+cat <<EOF
+static inline ${ret}
+${atomic}_${pfx}${name}${sfx}_release(${params})
+{
+	__atomic_release_fence();
+	${retstmt}${atomic}_${pfx}${name}${sfx}_relaxed(${args});
+}
+EOF
diff --git a/scripts/atomic/fallbacks/set_release b/scripts/atomic/fallbacks/set_release
new file mode 100644
index 000000000000..45bb5e0cfc08
--- /dev/null
+++ b/scripts/atomic/fallbacks/set_release
@@ -0,0 +1,7 @@
+cat <<EOF
+static inline void
+${atomic}_set_release(${atomic}_t *v, ${int} i)
+{
+	smp_store_release(&(v)->counter, i);
+}
+EOF
diff --git a/scripts/atomic/fallbacks/sub_and_test b/scripts/atomic/fallbacks/sub_and_test
new file mode 100644
index 000000000000..289ef17a2d7a
--- /dev/null
+++ b/scripts/atomic/fallbacks/sub_and_test
@@ -0,0 +1,16 @@
+cat <<EOF
+/**
+ * ${atomic}_sub_and_test - subtract value from variable and test result
+ * @i: integer value to subtract
+ * @v: pointer of type ${atomic}_t
+ *
+ * Atomically subtracts @i from @v and returns
+ * true if the result is zero, or false for all
+ * other cases.
+ */
+static inline bool
+${atomic}_sub_and_test(${int} i, ${atomic}_t *v)
+{
+	return ${atomic}_sub_return(i, v) == 0;
+}
+EOF
diff --git a/scripts/atomic/fallbacks/try_cmpxchg b/scripts/atomic/fallbacks/try_cmpxchg
new file mode 100644
index 000000000000..4ed85e2f5378
--- /dev/null
+++ b/scripts/atomic/fallbacks/try_cmpxchg
@@ -0,0 +1,11 @@
+cat <<EOF
+static inline bool
+${atomic}_try_cmpxchg${order}(${atomic}_t *v, ${int} *old, ${int} new)
+{
+	${int} r, o = *old;
+	r = ${atomic}_cmpxchg${order}(v, o, new);
+	if (unlikely(r != o))
+		*old = r;
+	return likely(r == o);
+}
+EOF
diff --git a/scripts/atomic/gen-atomic-fallback.sh b/scripts/atomic/gen-atomic-fallback.sh
new file mode 100644
index 000000000000..1bd7c1707633
--- /dev/null
+++ b/scripts/atomic/gen-atomic-fallback.sh
@@ -0,0 +1,181 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+ATOMICDIR=$(dirname $0)
+
+. ${ATOMICDIR}/atomic-tbl.sh
+
+#gen_template_fallback(template, meta, pfx, name, sfx, order, atomic, int, args...)
+gen_template_fallback()
+{
+	local template="$1"; shift
+	local meta="$1"; shift
+	local pfx="$1"; shift
+	local name="$1"; shift
+	local sfx="$1"; shift
+	local order="$1"; shift
+	local atomic="$1"; shift
+	local int="$1"; shift
+
+	local atomicname="${atomic}_${pfx}${name}${sfx}${order}"
+
+	local ret="$(gen_ret_type "${meta}" "${int}")"
+	local retstmt="$(gen_ret_stmt "${meta}")"
+	local params="$(gen_params "${int}" "${atomic}" "$@")"
+	local args="$(gen_args "$@")"
+
+	if [ ! -z "${template}" ]; then
+		printf "#ifndef ${atomicname}\n"
+		. ${template}
+		printf "#define ${atomicname} ${atomicname}\n"
+		printf "#endif\n\n"
+	fi
+}
+
+#gen_proto_fallback(meta, pfx, name, sfx, order, atomic, int, args...)
+gen_proto_fallback()
+{
+	local meta="$1"; shift
+	local pfx="$1"; shift
+	local name="$1"; shift
+	local sfx="$1"; shift
+	local order="$1"; shift
+
+	local tmpl="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
+	gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
+}
+
+#gen_basic_fallbacks(basename)
+gen_basic_fallbacks()
+{
+	local basename="$1"; shift
+cat << EOF
+#define ${basename}_acquire ${basename}
+#define ${basename}_release ${basename}
+#define ${basename}_relaxed ${basename}
+EOF
+}
+
+#gen_proto_order_variants(meta, pfx, name, sfx, atomic, int, args...)
+gen_proto_order_variants()
+{
+	local meta="$1"; shift
+	local pfx="$1"; shift
+	local name="$1"; shift
+	local sfx="$1"; shift
+	local atomic="$1"
+
+	local basename="${atomic}_${pfx}${name}${sfx}"
+
+	local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
+
+	# If we don't have relaxed atomics, then we don't bother with ordering fallbacks
+	# read_acquire and set_release need to be templated, though
+	if ! meta_has_relaxed "${meta}"; then
+		gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
+
+		if meta_has_acquire "${meta}"; then
+			gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
+		fi
+
+		if meta_has_release "${meta}"; then
+			gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
+		fi
+
+		return
+	fi
+
+	printf "#ifndef ${basename}_relaxed\n"
+
+	if [ ! -z "${template}" ]; then
+		printf "#ifdef ${basename}\n"
+	fi
+
+	gen_basic_fallbacks "${basename}"
+
+	if [ ! -z "${template}" ]; then
+		printf "#endif /* ${atomic}_${pfx}${name}${sfx} */\n\n"
+		gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
+		gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
+		gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
+		gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
+	fi
+
+	printf "#else /* ${basename}_relaxed */\n\n"
+
+	gen_template_fallback "${ATOMICDIR}/fallbacks/acquire"  "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
+	gen_template_fallback "${ATOMICDIR}/fallbacks/release"  "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
+	gen_template_fallback "${ATOMICDIR}/fallbacks/fence"  "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
+
+	printf "#endif /* ${basename}_relaxed */\n\n"
+}
+
+gen_xchg_fallbacks()
+{
+	local xchg="$1"; shift
+cat <<EOF
+#ifndef ${xchg}_relaxed
+#define ${xchg}_relaxed		${xchg}
+#define ${xchg}_acquire		${xchg}
+#define ${xchg}_release		${xchg}
+#else /* ${xchg}_relaxed */
+
+#ifndef ${xchg}_acquire
+#define ${xchg}_acquire(...) \\
+	__atomic_op_acquire(${xchg}, __VA_ARGS__)
+#endif
+
+#ifndef ${xchg}_release
+#define ${xchg}_release(...) \\
+	__atomic_op_release(${xchg}, __VA_ARGS__)
+#endif
+
+#ifndef ${xchg}
+#define ${xchg}(...) \\
+	__atomic_op_fence(${xchg}, __VA_ARGS__)
+#endif
+
+#endif /* ${xchg}_relaxed */
+
+EOF
+}
+
+cat << EOF
+// SPDX-License-Identifier: GPL-2.0
+
+// Generated by $0
+// DO NOT MODIFY THIS FILE DIRECTLY
+
+#ifndef _LINUX_ATOMIC_FALLBACK_H
+#define _LINUX_ATOMIC_FALLBACK_H
+
+EOF
+
+for xchg in "xchg" "cmpxchg" "cmpxchg64"; do
+	gen_xchg_fallbacks "${xchg}"
+done
+
+grep '^[a-z]' "$1" | while read name meta args; do
+	gen_proto "${meta}" "${name}" "atomic" "int" ${args}
+done
+
+cat <<EOF
+#define atomic_cond_read_acquire(v, c) smp_cond_load_acquire(&(v)->counter, (c))
+#define atomic_cond_read_relaxed(v, c) smp_cond_load_relaxed(&(v)->counter, (c))
+
+#ifdef CONFIG_GENERIC_ATOMIC64
+#include <asm-generic/atomic64.h>
+#endif
+
+EOF
+
+grep '^[a-z]' "$1" | while read name meta args; do
+	gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
+done
+
+cat <<EOF
+#define atomic64_cond_read_acquire(v, c) smp_cond_load_acquire(&(v)->counter, (c))
+#define atomic64_cond_read_relaxed(v, c) smp_cond_load_relaxed(&(v)->counter, (c))
+
+#endif /* _LINUX_ATOMIC_FALLBACK_H */
+EOF
diff --git a/scripts/atomic/gen-atomic-instrumented.sh b/scripts/atomic/gen-atomic-instrumented.sh
new file mode 100644
index 000000000000..e09812372b17
--- /dev/null
+++ b/scripts/atomic/gen-atomic-instrumented.sh
@@ -0,0 +1,182 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+ATOMICDIR=$(dirname $0)
+
+. ${ATOMICDIR}/atomic-tbl.sh
+
+#gen_param_check(arg)
+gen_param_check()
+{
+	local arg="$1"; shift
+	local type="${arg%%:*}"
+	local name="$(gen_param_name "${arg}")"
+	local rw="write"
+
+	case "${type#c}" in
+	i) return;;
+	esac
+
+	# We don't write to constant parameters
+	[ ${type#c} != ${type} ] && rw="read"
+
+	printf "\tkasan_check_${rw}(${name}, sizeof(*${name}));\n"
+}
+
+#gen_param_check(arg...)
+gen_params_checks()
+{
+	while [ "$#" -gt 0 ]; do
+		gen_param_check "$1"
+		shift;
+	done
+}
+
+# gen_guard(meta, atomic, pfx, name, sfx, order)
+gen_guard()
+{
+	local meta="$1"; shift
+	local atomic="$1"; shift
+	local pfx="$1"; shift
+	local name="$1"; shift
+	local sfx="$1"; shift
+	local order="$1"; shift
+
+	local atomicname="arch_${atomic}_${pfx}${name}${sfx}${order}"
+
+	local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
+
+	# We definitely need a preprocessor symbol for this atomic if it is an
+	# ordering variant, or if there's a generic fallback.
+	if [ ! -z "${order}" ] || [ ! -z "${template}" ]; then
+		printf "defined(${atomicname})"
+		return
+	fi
+
+	# If this is a base variant, but a relaxed variant *may* exist, then we
+	# only have a preprocessor symbol if the relaxed variant isn't defined
+	if meta_has_relaxed "${meta}"; then
+		printf "!defined(${atomicname}_relaxed) || defined(${atomicname})"
+	fi
+}
+
+#gen_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, arg...)
+gen_proto_order_variant()
+{
+	local meta="$1"; shift
+	local pfx="$1"; shift
+	local name="$1"; shift
+	local sfx="$1"; shift
+	local order="$1"; shift
+	local atomic="$1"; shift
+	local int="$1"; shift
+
+	local atomicname="${atomic}_${pfx}${name}${sfx}${order}"
+
+	local guard="$(gen_guard "${meta}" "${atomic}" "${pfx}" "${name}" "${sfx}" "${order}")"
+
+	local ret="$(gen_ret_type "${meta}" "${int}")"
+	local params="$(gen_params "${int}" "${atomic}" "$@")"
+	local checks="$(gen_params_checks "$@")"
+	local args="$(gen_args "$@")"
+	local retstmt="$(gen_ret_stmt "${meta}")"
+
+	[ ! -z "${guard}" ] && printf "#if ${guard}\n"
+
+cat <<EOF
+static inline ${ret}
+${atomicname}(${params})
+{
+${checks}
+	${retstmt}arch_${atomicname}(${args});
+}
+#define ${atomicname} ${atomicname}
+EOF
+
+	[ ! -z "${guard}" ] && printf "#endif\n"
+
+	printf "\n"
+}
+
+gen_xchg()
+{
+	local xchg="$1"; shift
+	local mult="$1"; shift
+
+cat <<EOF
+#define ${xchg}(ptr, ...)						\\
+({									\\
+	typeof(ptr) __ai_ptr = (ptr);					\\
+	kasan_check_write(__ai_ptr, ${mult}sizeof(*__ai_ptr));		\\
+	arch_${xchg}(__ai_ptr, __VA_ARGS__);				\\
+})
+EOF
+}
+
+gen_optional_xchg()
+{
+	local name="$1"; shift
+	local sfx="$1"; shift
+	local guard="defined(arch_${name}${sfx})"
+
+	[ -z "${sfx}" ] && guard="!defined(arch_${name}_relaxed) || defined(arch_${name})"
+
+	printf "#if ${guard}\n"
+	gen_xchg "${name}${sfx}" ""
+	printf "#endif\n\n"
+}
+
+cat << EOF
+// SPDX-License-Identifier: GPL-2.0
+
+// Generated by $0
+// DO NOT MODIFY THIS FILE DIRECTLY
+
+/*
+ * This file provides wrappers with KASAN instrumentation for atomic operations.
+ * To use this functionality an arch's atomic.h file needs to define all
+ * atomic operations with arch_ prefix (e.g. arch_atomic_read()) and include
+ * this file at the end. This file provides atomic_read() that forwards to
+ * arch_atomic_read() for actual atomic operation.
+ * Note: if an arch atomic operation is implemented by means of other atomic
+ * operations (e.g. atomic_read()/atomic_cmpxchg() loop), then it needs to use
+ * arch_ variants (i.e. arch_atomic_read()/arch_atomic_cmpxchg()) to avoid
+ * double instrumentation.
+ */
+#ifndef _ASM_GENERIC_ATOMIC_INSTRUMENTED_H
+#define _ASM_GENERIC_ATOMIC_INSTRUMENTED_H
+
+#include <linux/build_bug.h>
+#include <linux/kasan-checks.h>
+
+EOF
+
+grep '^[a-z]' "$1" | while read name meta args; do
+	gen_proto "${meta}" "${name}" "atomic" "int" ${args}
+done
+
+grep '^[a-z]' "$1" | while read name meta args; do
+	gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
+done
+
+for xchg in "xchg" "cmpxchg" "cmpxchg64"; do
+	for order in "" "_acquire" "_release" "_relaxed"; do
+		gen_optional_xchg "${xchg}" "${order}"
+	done
+done
+
+for xchg in "cmpxchg_local" "cmpxchg64_local" "sync_cmpxchg"; do
+	gen_xchg "${xchg}" ""
+	printf "\n"
+done
+
+gen_xchg "cmpxchg_double" "2 * "
+
+printf "\n\n"
+
+gen_xchg "cmpxchg_double_local" "2 * "
+
+cat <<EOF
+
+#endif /* _ASM_GENERIC_ATOMIC_INSTRUMENTED_H */
+EOF
diff --git a/scripts/atomic/gen-atomic-long.sh b/scripts/atomic/gen-atomic-long.sh
new file mode 100644
index 000000000000..c240a7231b2e
--- /dev/null
+++ b/scripts/atomic/gen-atomic-long.sh
@@ -0,0 +1,101 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+ATOMICDIR=$(dirname $0)
+
+. ${ATOMICDIR}/atomic-tbl.sh
+
+#gen_cast(arg, int, atomic)
+gen_cast()
+{
+	local arg="$1"; shift
+	local int="$1"; shift
+	local atomic="$1"; shift
+
+	[ "${arg%%:*}" = "p" ] || return
+
+	printf "($(gen_param_type "${arg}" "${int}" "${atomic}"))"
+}
+
+#gen_args_cast(int, atomic, arg...)
+gen_args_cast()
+{
+	local int="$1"; shift
+	local atomic="$1"; shift
+
+	while [ "$#" -gt 0 ]; do
+		local cast="$(gen_cast "$1" "${int}" "${atomic}")"
+		local arg="$(gen_param_name "$1")"
+		printf "${cast}${arg}"
+		[ "$#" -gt 1 ] && printf ", "
+		shift;
+	done
+}
+
+#gen_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, arg...)
+gen_proto_order_variant()
+{
+	local meta="$1"; shift
+	local name="$1$2$3$4"; shift; shift; shift; shift
+	local atomic="$1"; shift
+	local int="$1"; shift
+
+	local ret="$(gen_ret_type "${meta}" "long")"
+	local params="$(gen_params "long" "atomic_long" "$@")"
+	local argscast="$(gen_args_cast "${int}" "${atomic}" "$@")"
+	local retstmt="$(gen_ret_stmt "${meta}")"
+
+cat <<EOF
+static inline ${ret}
+atomic_long_${name}(${params})
+{
+	${retstmt}${atomic}_${name}(${argscast});
+}
+
+EOF
+}
+
+cat << EOF
+// SPDX-License-Identifier: GPL-2.0
+
+// Generated by $0
+// DO NOT MODIFY THIS FILE DIRECTLY
+
+#ifndef _ASM_GENERIC_ATOMIC_LONG_H
+#define _ASM_GENERIC_ATOMIC_LONG_H
+
+#include <asm/types.h>
+
+#ifdef CONFIG_64BIT
+typedef atomic64_t atomic_long_t;
+#define ATOMIC_LONG_INIT(i)		ATOMIC64_INIT(i)
+#define atomic_long_cond_read_acquire	atomic64_cond_read_acquire
+#define atomic_long_cond_read_relaxed	atomic64_cond_read_relaxed
+#else
+typedef atomic_t atomic_long_t;
+#define ATOMIC_LONG_INIT(i)		ATOMIC_INIT(i)
+#define atomic_long_cond_read_acquire	atomic_cond_read_acquire
+#define atomic_long_cond_read_relaxed	atomic_cond_read_relaxed
+#endif
+
+#ifdef CONFIG_64BIT
+
+EOF
+
+grep '^[a-z]' "$1" | while read name meta args; do
+	gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
+done
+
+cat <<EOF
+#else /* CONFIG_64BIT */
+
+EOF
+
+grep '^[a-z]' "$1" | while read name meta args; do
+	gen_proto "${meta}" "${name}" "atomic" "int" ${args}
+done
+
+cat <<EOF
+#endif /* CONFIG_64BIT */
+#endif /* _ASM_GENERIC_ATOMIC_LONG_H */
+EOF
-- 
cgit v1.2.3-59-g8ed1b


From 8d32588077bdc390420cfa6946f407033a20d7a8 Mon Sep 17 00:00:00 2001
From: Mark Rutland <mark.rutland@arm.com>
Date: Tue, 4 Sep 2018 11:48:29 +0100
Subject: locking/atomics: Check generated headers are up-to-date

Now that all the generated atomic headers are in place, it would be good
to ensure that:

a) the headers are up-to-date when scripting changes.

b) developers don't directly modify the generated headers.

To ensure both of these properties, let's add a Kbuild step to check
that the generated headers are up-to-date.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com
Cc: Will Deacon <will.deacon@arm.com>
Cc: linuxdrivers@attotech.com
Cc: dvyukov@google.com
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: arnd@arndb.de
Cc: aryabinin@virtuozzo.com
Cc: glider@google.com
Link: http://lkml.kernel.org/r/20180904104830.2975-6-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 Kbuild                          | 18 ++++++++++++++++--
 scripts/atomic/check-atomics.sh | 19 +++++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 scripts/atomic/check-atomics.sh

(limited to 'scripts')

diff --git a/Kbuild b/Kbuild
index 005304205482..47c9fe175bd9 100644
--- a/Kbuild
+++ b/Kbuild
@@ -6,7 +6,8 @@
 # 2) Generate timeconst.h
 # 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
 # 4) Check for missing system calls
-# 5) Generate constants.py (may need bounds.h)
+# 5) check atomics headers are up-to-date
+# 6) Generate constants.py (may need bounds.h)
 
 #####
 # 1) Generate bounds.h
@@ -72,7 +73,20 @@ missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
 	$(call cmd,syscalls)
 
 #####
-# 5) Generate constants for Python GDB integration
+# 5) Check atomic headers are up-to-date
+#
+
+always += old-atomics
+targets += old-atomics
+
+quiet_cmd_atomics = CALL    $<
+      cmd_atomics = $(CONFIG_SHELL) scripts/atomic/check-atomics.sh
+
+old-atomics: scripts/atomic/check-atomics.sh FORCE
+	$(call cmd,atomics)
+
+#####
+# 6) Generate constants for Python GDB integration
 #
 
 extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
diff --git a/scripts/atomic/check-atomics.sh b/scripts/atomic/check-atomics.sh
new file mode 100644
index 000000000000..c30101cddf2d
--- /dev/null
+++ b/scripts/atomic/check-atomics.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Check if atomic headers are up-to-date
+
+ATOMICDIR=$(dirname $0)
+ATOMICTBL=${ATOMICDIR}/atomics.tbl
+LINUXDIR=${ATOMICDIR}/../..
+
+cat <<EOF |
+gen-atomic-instrumented.sh      asm-generic/atomic-instrumented.h
+gen-atomic-long.sh              asm-generic/atomic-long.h
+gen-atomic-fallback.sh          linux/atomic-fallback.h
+EOF
+while read script header; do
+	if ! (${ATOMICDIR}/${script} ${ATOMICTBL} | diff - ${LINUXDIR}/include/${header} > /dev/null); then
+		printf "warning: include/${header} is out-of-date.\n"
+	fi
+done
-- 
cgit v1.2.3-59-g8ed1b


From 4d8e5cd233db0c11e6ad35b0e40f4a2d284e1e18 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@kernel.org>
Date: Thu, 1 Nov 2018 12:44:48 +0100
Subject: locking/atomics: Fix scripts/atomic/ script permissions

Mark all these scripts executable.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: linuxdrivers@attotech.com
Cc: dvyukov@google.com
Cc: boqun.feng@gmail.com
Cc: arnd@arndb.de
Cc: aryabinin@virtuozzo.com
Cc: glider@google.com
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 scripts/atomic/atomic-tbl.sh                 | 0
 scripts/atomic/atomics.tbl                   | 0
 scripts/atomic/check-atomics.sh              | 0
 scripts/atomic/fallbacks/acquire             | 0
 scripts/atomic/fallbacks/add_negative        | 0
 scripts/atomic/fallbacks/add_unless          | 0
 scripts/atomic/fallbacks/andnot              | 0
 scripts/atomic/fallbacks/dec                 | 0
 scripts/atomic/fallbacks/dec_and_test        | 0
 scripts/atomic/fallbacks/dec_if_positive     | 0
 scripts/atomic/fallbacks/dec_unless_positive | 0
 scripts/atomic/fallbacks/fence               | 0
 scripts/atomic/fallbacks/fetch_add_unless    | 0
 scripts/atomic/fallbacks/inc                 | 0
 scripts/atomic/fallbacks/inc_and_test        | 0
 scripts/atomic/fallbacks/inc_not_zero        | 0
 scripts/atomic/fallbacks/inc_unless_negative | 0
 scripts/atomic/fallbacks/read_acquire        | 0
 scripts/atomic/fallbacks/release             | 0
 scripts/atomic/fallbacks/set_release         | 0
 scripts/atomic/fallbacks/sub_and_test        | 0
 scripts/atomic/fallbacks/try_cmpxchg         | 0
 scripts/atomic/gen-atomic-fallback.sh        | 0
 scripts/atomic/gen-atomic-instrumented.sh    | 0
 scripts/atomic/gen-atomic-long.sh            | 0
 25 files changed, 0 insertions(+), 0 deletions(-)
 mode change 100644 => 100755 scripts/atomic/atomic-tbl.sh
 mode change 100644 => 100755 scripts/atomic/atomics.tbl
 mode change 100644 => 100755 scripts/atomic/check-atomics.sh
 mode change 100644 => 100755 scripts/atomic/fallbacks/acquire
 mode change 100644 => 100755 scripts/atomic/fallbacks/add_negative
 mode change 100644 => 100755 scripts/atomic/fallbacks/add_unless
 mode change 100644 => 100755 scripts/atomic/fallbacks/andnot
 mode change 100644 => 100755 scripts/atomic/fallbacks/dec
 mode change 100644 => 100755 scripts/atomic/fallbacks/dec_and_test
 mode change 100644 => 100755 scripts/atomic/fallbacks/dec_if_positive
 mode change 100644 => 100755 scripts/atomic/fallbacks/dec_unless_positive
 mode change 100644 => 100755 scripts/atomic/fallbacks/fence
 mode change 100644 => 100755 scripts/atomic/fallbacks/fetch_add_unless
 mode change 100644 => 100755 scripts/atomic/fallbacks/inc
 mode change 100644 => 100755 scripts/atomic/fallbacks/inc_and_test
 mode change 100644 => 100755 scripts/atomic/fallbacks/inc_not_zero
 mode change 100644 => 100755 scripts/atomic/fallbacks/inc_unless_negative
 mode change 100644 => 100755 scripts/atomic/fallbacks/read_acquire
 mode change 100644 => 100755 scripts/atomic/fallbacks/release
 mode change 100644 => 100755 scripts/atomic/fallbacks/set_release
 mode change 100644 => 100755 scripts/atomic/fallbacks/sub_and_test
 mode change 100644 => 100755 scripts/atomic/fallbacks/try_cmpxchg
 mode change 100644 => 100755 scripts/atomic/gen-atomic-fallback.sh
 mode change 100644 => 100755 scripts/atomic/gen-atomic-instrumented.sh
 mode change 100644 => 100755 scripts/atomic/gen-atomic-long.sh

(limited to 'scripts')

diff --git a/scripts/atomic/atomic-tbl.sh b/scripts/atomic/atomic-tbl.sh
old mode 100644
new mode 100755
diff --git a/scripts/atomic/atomics.tbl b/scripts/atomic/atomics.tbl
old mode 100644
new mode 100755
diff --git a/scripts/atomic/check-atomics.sh b/scripts/atomic/check-atomics.sh
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/acquire b/scripts/atomic/fallbacks/acquire
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/add_negative b/scripts/atomic/fallbacks/add_negative
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/add_unless b/scripts/atomic/fallbacks/add_unless
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/andnot b/scripts/atomic/fallbacks/andnot
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/dec b/scripts/atomic/fallbacks/dec
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/dec_and_test b/scripts/atomic/fallbacks/dec_and_test
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/dec_if_positive b/scripts/atomic/fallbacks/dec_if_positive
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/dec_unless_positive b/scripts/atomic/fallbacks/dec_unless_positive
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/fence b/scripts/atomic/fallbacks/fence
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/fetch_add_unless b/scripts/atomic/fallbacks/fetch_add_unless
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/inc b/scripts/atomic/fallbacks/inc
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/inc_and_test b/scripts/atomic/fallbacks/inc_and_test
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/inc_not_zero b/scripts/atomic/fallbacks/inc_not_zero
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/inc_unless_negative b/scripts/atomic/fallbacks/inc_unless_negative
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/read_acquire b/scripts/atomic/fallbacks/read_acquire
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/release b/scripts/atomic/fallbacks/release
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/set_release b/scripts/atomic/fallbacks/set_release
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/sub_and_test b/scripts/atomic/fallbacks/sub_and_test
old mode 100644
new mode 100755
diff --git a/scripts/atomic/fallbacks/try_cmpxchg b/scripts/atomic/fallbacks/try_cmpxchg
old mode 100644
new mode 100755
diff --git a/scripts/atomic/gen-atomic-fallback.sh b/scripts/atomic/gen-atomic-fallback.sh
old mode 100644
new mode 100755
diff --git a/scripts/atomic/gen-atomic-instrumented.sh b/scripts/atomic/gen-atomic-instrumented.sh
old mode 100644
new mode 100755
diff --git a/scripts/atomic/gen-atomic-long.sh b/scripts/atomic/gen-atomic-long.sh
old mode 100644
new mode 100755
-- 
cgit v1.2.3-59-g8ed1b


From b14e77f89aca1c2763f65dc274b5837a185ab13f Mon Sep 17 00:00:00 2001
From: Anders Roxell <anders.roxell@linaro.org>
Date: Mon, 11 Feb 2019 13:20:34 +0000
Subject: locking/atomics: Change 'fold' to 'grep'

Some distibutions and build systems doesn't include 'fold' from
coreutils default.

.../scripts/atomic/atomic-tbl.sh: line 183: fold: command not found

Rework to use 'grep' instead of 'fold' to use a dependency that is
already used a lot in the kernel.

[Mark: rework commit message]

Suggested-by: Will Deacon <will.deacon@arm.com>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akpm@linux-foundation.org
Cc: boqun.feng@gmail.com
Cc: linux-kernel@vger.kernel.rg
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 scripts/atomic/atomic-tbl.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'scripts')

diff --git a/scripts/atomic/atomic-tbl.sh b/scripts/atomic/atomic-tbl.sh
index 9d6be538a987..81d5c32039dd 100755
--- a/scripts/atomic/atomic-tbl.sh
+++ b/scripts/atomic/atomic-tbl.sh
@@ -180,7 +180,7 @@ gen_proto_variants()
 #gen_proto(meta, ...)
 gen_proto() {
 	local meta="$1"; shift
-	for m in $(echo "${meta}" | fold -w1); do
+	for m in $(echo "${meta}" | grep -o .); do
 		gen_proto_variants "${m}" "$@"
 	done
 }
-- 
cgit v1.2.3-59-g8ed1b


From 0cf264b3133dce56a60ca8b4335d1f76fe26870a Mon Sep 17 00:00:00 2001
From: Mark Rutland <mark.rutland@arm.com>
Date: Mon, 11 Feb 2019 13:20:35 +0000
Subject: locking/atomics: Check atomic headers with sha1sum

We currently check the atomic headers at build-time to ensure they
haven't been modified directly, and these checks require regenerating
the headers in full. As this takes a few seconds, even when
parallelized, this is too slow to run for every kernel build.

Instead, we can generate a hash of each header as we generate them,
which we can cheaply check at build time (~0.16s for all headers).

This patch does so, updating headers with their hashes using the new
gen-atomics.sh script. As some users apparently build the kernel wihout
coreutils, lacking sha1sum, the checks are skipped in this case.
Presumably, most developers have a working coreutils installation.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: anders.roxell@linaro.org
Cc: linux-kernel@vger.kernel.rg
Cc: naresh.kamboju@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 include/asm-generic/atomic-instrumented.h |  1 +
 include/asm-generic/atomic-long.h         |  1 +
 include/linux/atomic-fallback.h           |  1 +
 scripts/atomic/check-atomics.sh           | 26 ++++++++++++++++++++------
 scripts/atomic/gen-atomics.sh             | 20 ++++++++++++++++++++
 5 files changed, 43 insertions(+), 6 deletions(-)
 create mode 100644 scripts/atomic/gen-atomics.sh

(limited to 'scripts')

diff --git a/include/asm-generic/atomic-instrumented.h b/include/asm-generic/atomic-instrumented.h
index b8f5b35216e1..e8730c6b9fe2 100644
--- a/include/asm-generic/atomic-instrumented.h
+++ b/include/asm-generic/atomic-instrumented.h
@@ -1785,3 +1785,4 @@ atomic64_dec_if_positive(atomic64_t *v)
 })
 
 #endif /* _ASM_GENERIC_ATOMIC_INSTRUMENTED_H */
+// b29b625d5de9280f680e42c7be859b55b15e5f6a
diff --git a/include/asm-generic/atomic-long.h b/include/asm-generic/atomic-long.h
index a833d385a70b..881c7e27af28 100644
--- a/include/asm-generic/atomic-long.h
+++ b/include/asm-generic/atomic-long.h
@@ -1010,3 +1010,4 @@ atomic_long_dec_if_positive(atomic_long_t *v)
 
 #endif /* CONFIG_64BIT */
 #endif /* _ASM_GENERIC_ATOMIC_LONG_H */
+// 77558968132ce4f911ad53f6f52ce423006f6268
diff --git a/include/linux/atomic-fallback.h b/include/linux/atomic-fallback.h
index 1c02c0112fbb..a7d240e465c0 100644
--- a/include/linux/atomic-fallback.h
+++ b/include/linux/atomic-fallback.h
@@ -2292,3 +2292,4 @@ atomic64_dec_if_positive(atomic64_t *v)
 #define atomic64_cond_read_relaxed(v, c) smp_cond_load_relaxed(&(v)->counter, (c))
 
 #endif /* _LINUX_ATOMIC_FALLBACK_H */
+// 25de4a2804d70f57e994fe3b419148658bb5378a
diff --git a/scripts/atomic/check-atomics.sh b/scripts/atomic/check-atomics.sh
index c30101cddf2d..cfa0c2f71c84 100755
--- a/scripts/atomic/check-atomics.sh
+++ b/scripts/atomic/check-atomics.sh
@@ -7,13 +7,27 @@ ATOMICDIR=$(dirname $0)
 ATOMICTBL=${ATOMICDIR}/atomics.tbl
 LINUXDIR=${ATOMICDIR}/../..
 
+echo '' | sha1sum - > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+	printf "sha1sum not available, skipping atomic header checks.\n"
+	exit 0
+fi
+
 cat <<EOF |
-gen-atomic-instrumented.sh      asm-generic/atomic-instrumented.h
-gen-atomic-long.sh              asm-generic/atomic-long.h
-gen-atomic-fallback.sh          linux/atomic-fallback.h
+asm-generic/atomic-instrumented.h
+asm-generic/atomic-long.h
+linux/atomic-fallback.h
 EOF
-while read script header; do
-	if ! (${ATOMICDIR}/${script} ${ATOMICTBL} | diff - ${LINUXDIR}/include/${header} > /dev/null); then
-		printf "warning: include/${header} is out-of-date.\n"
+while read header; do
+	OLDSUM="$(tail -n 1 ${LINUXDIR}/include/${header})"
+	OLDSUM="${OLDSUM#// }"
+
+	NEWSUM="$(head -n -1 ${LINUXDIR}/include/${header} | sha1sum)"
+	NEWSUM="${NEWSUM%% *}"
+
+	if [ "${OLDSUM}" != "${NEWSUM}" ]; then
+		printf "warning: generated include/${header} has been modified.\n"
 	fi
 done
+
+exit 0
diff --git a/scripts/atomic/gen-atomics.sh b/scripts/atomic/gen-atomics.sh
new file mode 100644
index 000000000000..27400b0cd732
--- /dev/null
+++ b/scripts/atomic/gen-atomics.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Generate atomic headers
+
+ATOMICDIR=$(dirname $0)
+ATOMICTBL=${ATOMICDIR}/atomics.tbl
+LINUXDIR=${ATOMICDIR}/../..
+
+cat <<EOF |
+gen-atomic-instrumented.sh      asm-generic/atomic-instrumented.h
+gen-atomic-long.sh              asm-generic/atomic-long.h
+gen-atomic-fallback.sh          linux/atomic-fallback.h
+EOF
+while read script header; do
+	${ATOMICDIR}/${script} ${ATOMICTBL} > ${LINUXDIR}/include/${header}
+	HASH="$(sha1sum ${LINUXDIR}/include/${header})"
+	HASH="${HASH%% *}"
+	printf "// %s\n" "${HASH}" >> ${LINUXDIR}/include/${header}
+done
-- 
cgit v1.2.3-59-g8ed1b