From 8c27ceff3604b249a9efafbd1bd8b141b79e619d Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Tue, 18 Oct 2016 10:12:27 -0200 Subject: docs: fix locations of several documents that got moved The previous patch renamed several files that are cross-referenced along the Kernel documentation. Adjust the links to point to the right places. Signed-off-by: Mauro Carvalho Chehab --- scripts/checkpatch.pl | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index a8368d1c4348..d0c729ccec20 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -2187,7 +2187,7 @@ sub process { if ($rawline=~/^\+\+\+\s+(\S+)/) { $setup_docs = 0; - if ($1 =~ m@Documentation/kernel-parameters.txt$@) { + if ($1 =~ m@Documentation/admin-guide/kernel-parameters.rst$@) { $setup_docs = 1; } #next; @@ -5102,7 +5102,7 @@ sub process { my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b}; if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) { WARN("VOLATILE", - "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr); + "Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst\n" . $herecurr); } # Check for user-visible strings broken across lines, which breaks the ability @@ -5817,7 +5817,7 @@ sub process { if (!grep(/$name/, @setup_docs)) { CHK("UNDOCUMENTED_SETUP", - "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr); + "__setup appears un-documented -- check Documentation/admin-guide/kernel-parameters.rst\n" . $herecurr); } } -- cgit v1.3-7-g2ca7 From 0f5225b024d4bffd682aab008c35862e8fdc1865 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 7 Oct 2016 17:43:51 +0200 Subject: locking/mutex, drm: Introduce mutex_trylock_recursive() By popular DRM demand, introduce mutex_trylock_recursive() to fix up the two GEM users. Without this it is very easy for these drivers to get stuck in low-memory situations and trigger OOM. Work is in progress to remove the need for this in at least i915. Signed-off-by: Peter Zijlstra (Intel) Cc: Chris Wilson Cc: Daniel Vetter Cc: David Airlie Cc: Davidlohr Bueso Cc: Ding Tianhong Cc: Imre Deak Cc: Jason Low Cc: Linus Torvalds Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rob Clark Cc: Terry Rudd Cc: Thomas Gleixner Cc: Tim Chen Cc: Will Deacon Cc: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar --- drivers/gpu/drm/i915/i915_gem_shrinker.c | 15 ++++++++++++--- drivers/gpu/drm/msm/msm_gem_shrinker.c | 16 ++++++++++++---- include/linux/mutex.h | 31 +++++++++++++++++++++++++++++++ scripts/checkpatch.pl | 6 ++++++ 4 files changed, 61 insertions(+), 7 deletions(-) (limited to 'scripts/checkpatch.pl') diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c index e9bd2a81d03a..c450076d2f9b 100644 --- a/drivers/gpu/drm/i915/i915_gem_shrinker.c +++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c @@ -227,11 +227,20 @@ unsigned long i915_gem_shrink_all(struct drm_i915_private *dev_priv) static bool i915_gem_shrinker_lock(struct drm_device *dev, bool *unlock) { - if (!mutex_trylock(&dev->struct_mutex)) + switch (mutex_trylock_recursive(&dev->struct_mutex)) { + case MUTEX_TRYLOCK_FAILED: return false; - *unlock = true; - return true; + case MUTEX_TRYLOCK_SUCCESS: + *unlock = true; + return true; + + case MUTEX_TRYLOCK_RECURSIVE: + *unlock = false; + return true; + } + + BUG(); } static unsigned long diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c index 6d2e885bd58e..b77bca75bb5f 100644 --- a/drivers/gpu/drm/msm/msm_gem_shrinker.c +++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c @@ -20,13 +20,21 @@ static bool msm_gem_shrinker_lock(struct drm_device *dev, bool *unlock) { - if (!mutex_trylock(&dev->struct_mutex)) + switch (mutex_trylock_recursive(&dev->struct_mutex)) { + case MUTEX_TRYLOCK_FAILED: return false; - *unlock = true; - return true; -} + case MUTEX_TRYLOCK_SUCCESS: + *unlock = true; + return true; + + case MUTEX_TRYLOCK_RECURSIVE: + *unlock = false; + return true; + } + BUG(); +} static unsigned long msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) diff --git a/include/linux/mutex.h b/include/linux/mutex.h index 4d3bccabbea5..6a902f0a2148 100644 --- a/include/linux/mutex.h +++ b/include/linux/mutex.h @@ -189,4 +189,35 @@ extern void mutex_unlock(struct mutex *lock); extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock); +/* + * These values are chosen such that FAIL and SUCCESS match the + * values of the regular mutex_trylock(). + */ +enum mutex_trylock_recursive_enum { + MUTEX_TRYLOCK_FAILED = 0, + MUTEX_TRYLOCK_SUCCESS = 1, + MUTEX_TRYLOCK_RECURSIVE, +}; + +/** + * mutex_trylock_recursive - trylock variant that allows recursive locking + * @lock: mutex to be locked + * + * This function should not be used, _ever_. It is purely for hysterical GEM + * raisins, and once those are gone this will be removed. + * + * Returns: + * MUTEX_TRYLOCK_FAILED - trylock failed, + * MUTEX_TRYLOCK_SUCCESS - lock acquired, + * MUTEX_TRYLOCK_RECURSIVE - we already owned the lock. + */ +static inline __deprecated __must_check enum mutex_trylock_recursive_enum +mutex_trylock_recursive(struct mutex *lock) +{ + if (unlikely(__mutex_owner(lock) == current)) + return MUTEX_TRYLOCK_RECURSIVE; + + return mutex_trylock(lock); +} + #endif /* __LINUX_MUTEX_H */ diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index a8368d1c4348..23f462f64a3f 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -6076,6 +6076,12 @@ sub process { } } +# check for mutex_trylock_recursive usage + if ($line =~ /mutex_trylock_recursive/) { + ERROR("LOCKING", + "recursive locking is bad, do not use this ever.\n" . $herecurr); + } + # check for lockdep_set_novalidate_class if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ || $line =~ /__lockdep_no_validate__\s*\)/ ) { -- cgit v1.3-7-g2ca7 From f2c19c2f380fcfdc85eb750016d73f7cd3e77573 Mon Sep 17 00:00:00 2001 From: Jerome Forissier Date: Mon, 12 Dec 2016 16:46:23 -0800 Subject: checkpatch: don't try to get maintained status when --no-tree is given Fixes the following warning: Use of uninitialized value $root in concatenation (.) or string at /path/to/checkpatch.pl line 764. Link: http://lkml.kernel.org/r/1476719709-16668-1-git-send-email-jerome.forissier@linaro.org Signed-off-by: Jerome Forissier Reviewed-by: Brian Norris Acked-by: Joe Perches Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/checkpatch.pl | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 23f462f64a3f..7000adb5820c 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -761,7 +761,7 @@ sub seed_camelcase_file { sub is_maintained_obsolete { my ($filename) = @_; - return 0 if (!(-e "$root/scripts/get_maintainer.pl")); + return 0 if (!$tree || !(-e "$root/scripts/get_maintainer.pl")); my $status = `perl $root/scripts/get_maintainer.pl --status --nom --nol --nogit --nogit-fallback -f $filename 2>&1`; -- cgit v1.3-7-g2ca7 From 224236d9c3a65d23cd3f113042404cf5e09e393c Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Mon, 12 Dec 2016 16:46:26 -0800 Subject: scripts/checkpatch.pl: fix spelling s/preceeded/preceded/ Cc: Joe Perches Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/checkpatch.pl | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 7000adb5820c..9f651bcde046 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -5925,7 +5925,7 @@ sub process { } if (!$has_break && $has_statement) { WARN("MISSING_BREAK", - "Possible switch case/default not preceeded by break or fallthrough comment\n" . $herecurr); + "Possible switch case/default not preceded by break or fallthrough comment\n" . $herecurr); } } -- cgit v1.3-7-g2ca7 From d6430f71805aa98d6e8fbc67e605922aefcf9ceb Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Mon, 12 Dec 2016 16:46:28 -0800 Subject: checkpatch: don't check .pl files, improve absolute path commit log test perl files (*.pl) are mostly inappropriate to check coding styles so exempt them from long line checks and various .[ch] file type tests. And as well, only scan absolute paths in the commit log, not in the patch. Link: http://lkml.kernel.org/r/85b101d50acafe6c0261d9f7df283c827da52c4a.1477340110.git.joe@perches.com Signed-off-by: Joe Perches Cc: Andy Whitcroft Cc: Heinrich Schuchardt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/checkpatch.pl | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 9f651bcde046..0c20f035ed99 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -2601,20 +2601,6 @@ sub process { $herecurr) if (!$emitted_corrupt++); } -# Check for absolute kernel paths. - if ($tree) { - while ($line =~ m{(?:^|\s)(/\S*)}g) { - my $file = $1; - - if ($file =~ m{^(.*?)(?::\d+)+:?$} && - check_absolute_file($1, $herecurr)) { - # - } else { - check_absolute_file($file, $herecurr); - } - } - } - # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php if (($realfile =~ /^$/ || $line =~ /^\+/) && $rawline !~ m/^$UTF8*$/) { @@ -2652,6 +2638,20 @@ sub process { "8-bit UTF-8 used in possible commit log\n" . $herecurr); } +# Check for absolute kernel paths in commit message + if ($tree && $in_commit_log) { + while ($line =~ m{(?:^|\s)(/\S*)}g) { + my $file = $1; + + if ($file =~ m{^(.*?)(?::\d+)+:?$} && + check_absolute_file($1, $herecurr)) { + # + } else { + check_absolute_file($file, $herecurr); + } + } + } + # Check for various typo / spelling mistakes if (defined($misspellings) && ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) { @@ -2805,7 +2805,7 @@ sub process { } # check we are in a valid source file if not then ignore this hunk - next if ($realfile !~ /\.(h|c|s|S|pl|sh|dtsi|dts)$/); + next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/); # line length limit (with some exclusions) # -- cgit v1.3-7-g2ca7 From 11ca40a0f8e3a788a987f14cb80d836a34d109ae Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Mon, 12 Dec 2016 16:46:31 -0800 Subject: checkpatch: avoid multiple line dereferences Code that puts a single dereferencing identifier on multiple lines like: struct_identifier->member[index]. member = ; is generally hard to follow. Prefer that dereferencing identifiers be single line. Link: http://lkml.kernel.org/r/e9c191ae3f41bedc8ffd5c0fbcc5a1cec1d1d2df.1478120869.git.joe@perches.com Signed-off-by: Joe Perches Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/checkpatch.pl | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 0c20f035ed99..cf95d3ae0754 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -3440,6 +3440,18 @@ sub process { #ignore lines not being added next if ($line =~ /^[^\+]/); +# check for dereferences that span multiple lines + if ($prevline =~ /^\+.*$Lval\s*(?:\.|->)\s*$/ && + $line =~ /^\+\s*(?!\#\s*(?!define\s+|if))\s*$Lval/) { + $prevline =~ /($Lval\s*(?:\.|->))\s*$/; + my $ref = $1; + $line =~ /^.\s*($Lval)/; + $ref .= $1; + $ref =~ s/\s//g; + WARN("MULTILINE_DEREFERENCE", + "Avoid multiple line dereference - prefer '$ref'\n" . $hereprev); + } + # check for declarations of signed or unsigned without int while ($line =~ m{\b($Declare)\s*(?!char\b|short\b|int\b|long\b)\s*($Ident)?\s*[=,;\[\)\(]}g) { my $type = $1; -- cgit v1.3-7-g2ca7 From fd39f904b17686df0f409e880af1ccfa2fe4ae1a Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Mon, 12 Dec 2016 16:46:34 -0800 Subject: checkpatch: don't check c99 types like uint8_t under tools Tools contains user space code so uintX_t types are just fine. Link: http://lkml.kernel.org/r/1479286379-853-1-git-send-email-tomas.winkler@intel.com Signed-off-by: Tomas Winkler Acked-by: Joe Perches Cc: Andy Whitcroft Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/checkpatch.pl | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index cf95d3ae0754..7997300d5d30 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -5560,8 +5560,9 @@ sub process { "Using weak declarations can have unintended link defects\n" . $herecurr); } -# check for c99 types like uint8_t used outside of uapi/ +# check for c99 types like uint8_t used outside of uapi/ and tools/ if ($realfile !~ m@\binclude/uapi/@ && + $realfile !~ m@\btools/@ && $line =~ /\b($Declare)\s*$Ident\s*[=;,\[]/) { my $type = $1; if ($type =~ /\b($typeC99Typedefs)\b/) { -- cgit v1.3-7-g2ca7 From a82603a8325f89ec53d4c3e249a2e831b747a69d Mon Sep 17 00:00:00 2001 From: Andrew Jeffery Date: Mon, 12 Dec 2016 16:46:37 -0800 Subject: checkpatch: don't emit unified-diff error for rename-only patches I generated a patch with `git format-patch` which checkpatch thinks is invalid: $ ./scripts/checkpatch.pl lpc-dt/0006-mfd-dt-Move-syscon-bindings-to-syscon-subdirectory.patch WARNING: added, moved or deleted file(s), does MAINTAINERS need updating? Documentation/devicetree/bindings/mfd/{ => syscon}/aspeed-scu.txt | 0 ERROR: Does not appear to be a unified-diff format patch total: 1 errors, 1 warnings, 0 lines checked NOTE: For some of the reported defects, checkpatch may be able to mechanically convert to the typical style using --fix or --fix-inplace. lpc-dt/0006-mfd-dt-Move-syscon-bindings-to-syscon-subdirectory.patch has style problems, please review. NOTE: If any of the errors are false positives, please report them to the maintainer, see CHECKPATCH in MAINTAINERS. The patch in question was all renames with no edits, giving 100% similarity and thus no diff markers. Set '$is_patch = 1;' in the add/remove/rename detection to avoid generating spurious warnings. Link: http://lkml.kernel.org/r/20161205232224.22685-1-andrew@aj.id.au Signed-off-by: Andrew Jeffery Acked-by: Joe Perches Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/checkpatch.pl | 1 + 1 file changed, 1 insertion(+) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 7997300d5d30..ac5656ef2aec 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -2589,6 +2589,7 @@ sub process { $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ || ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ && (defined($1) || defined($2))))) { + $is_patch = 1; $reported_maintainer_file = 1; WARN("FILE_PATH_CHANGES", "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr); -- cgit v1.3-7-g2ca7 From 46d832f5e2102cce455672c5a0b8cbe97e27fe42 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Sun, 11 Dec 2016 06:29:58 +0200 Subject: checkpatch: replace __bitwise__ with __bitwise __bitwise__ is an implementation detail now. Signed-off-by: Michael S. Tsirkin --- scripts/checkpatch.pl | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index fd3556b2a5d1..982c52ca6473 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -335,7 +335,7 @@ our $Attribute = qr{ __percpu| __nocast| __safe| - __bitwise__| + __bitwise| __packed__| __packed2__| __naked| @@ -3681,7 +3681,7 @@ sub process { $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ && $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ && $line !~ /\b$typeTypedefs\b/ && - $line !~ /\b__bitwise(?:__|)\b/) { + $line !~ /\b__bitwise\b/) { WARN("NEW_TYPEDEFS", "do not add new typedefs\n" . $herecurr); } -- cgit v1.3-7-g2ca7