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authorAl Viro <viro@zeniv.linux.org.uk>2017-03-21 12:02:25 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2017-04-26 12:05:56 -0400
commit9a677341cd8de01a9eaf2c24a4b735939e507943 (patch)
tree2e0a07f71d8fbfd22084c3289b1f5b2ab2bd1aaf /arch/m32r
parentm32r: get rid of zeroing (diff)
downloadlinux-dev-9a677341cd8de01a9eaf2c24a4b735939e507943.tar.xz
linux-dev-9a677341cd8de01a9eaf2c24a4b735939e507943.zip
m32r: switch to RAW_COPY_USER
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/m32r')
-rw-r--r--arch/m32r/Kconfig1
-rw-r--r--arch/m32r/include/asm/uaccess.h98
-rw-r--r--arch/m32r/kernel/m32r_ksyms.c2
-rw-r--r--arch/m32r/lib/usercopy.c22
4 files changed, 8 insertions, 115 deletions
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 95474460b367..b3e82bdd6db0 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -19,6 +19,7 @@ config M32R
select HAVE_DEBUG_STACKOVERFLOW
select CPU_NO_EFFICIENT_FFS
select DMA_NOOP_OPS
+ select ARCH_HAS_RAW_COPY_USER
config SBUS
bool
diff --git a/arch/m32r/include/asm/uaccess.h b/arch/m32r/include/asm/uaccess.h
index d5c5e68fa2fb..07be349c00ad 100644
--- a/arch/m32r/include/asm/uaccess.h
+++ b/arch/m32r/include/asm/uaccess.h
@@ -13,6 +13,7 @@
*/
#include <asm/page.h>
#include <asm/setup.h>
+#include <linux/prefetch.h>
/*
* The fs value determines whether argument validity checking should be
@@ -463,107 +464,22 @@ do { \
/* We let the __ versions of copy_from/to_user inline, because they're often
* used in fast paths and have only a small space overhead.
*/
-static inline unsigned long __generic_copy_from_user_nocheck(void *to,
- const void __user *from, unsigned long n)
+static inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
+ prefetchw(to);
__copy_user(to, from, n);
return n;
}
-static inline unsigned long __generic_copy_to_user_nocheck(void __user *to,
- const void *from, unsigned long n)
+static inline unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
+ prefetch(from);
__copy_user(to, from, n);
return n;
}
-unsigned long __generic_copy_to_user(void __user *, const void *, unsigned long);
-unsigned long __generic_copy_from_user(void *, const void __user *, unsigned long);
-
-/**
- * __copy_to_user: - Copy a block of data into user space, with less checking.
- * @to: Destination address, in user space.
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- * Context: User context only. This function may sleep if pagefaults are
- * enabled.
- *
- * Copy data from kernel space to user space. Caller must check
- * the specified block with access_ok() before calling this function.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- */
-#define __copy_to_user(to, from, n) \
- __generic_copy_to_user_nocheck((to), (from), (n))
-
-#define __copy_to_user_inatomic __copy_to_user
-#define __copy_from_user_inatomic __copy_from_user
-
-/**
- * copy_to_user: - Copy a block of data into user space.
- * @to: Destination address, in user space.
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- * Context: User context only. This function may sleep if pagefaults are
- * enabled.
- *
- * Copy data from kernel space to user space.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- */
-#define copy_to_user(to, from, n) \
-({ \
- might_fault(); \
- __generic_copy_to_user((to), (from), (n)); \
-})
-
-/**
- * __copy_from_user: - Copy a block of data from user space, with less checking. * @to: Destination address, in kernel space.
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- * Context: User context only. This function may sleep if pagefaults are
- * enabled.
- *
- * Copy data from user space to kernel space. Caller must check
- * the specified block with access_ok() before calling this function.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- *
- * If some data could not be copied, this function will pad the copied
- * data to the requested size using zero bytes.
- */
-#define __copy_from_user(to, from, n) \
- __generic_copy_from_user_nocheck((to), (from), (n))
-
-/**
- * copy_from_user: - Copy a block of data from user space.
- * @to: Destination address, in kernel space.
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- * Context: User context only. This function may sleep if pagefaults are
- * enabled.
- *
- * Copy data from user space to kernel space.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- *
- * If some data could not be copied, this function will pad the copied
- * data to the requested size using zero bytes.
- */
-#define copy_from_user(to, from, n) \
-({ \
- might_fault(); \
- __generic_copy_from_user((to), (from), (n)); \
-})
-
long __must_check strncpy_from_user(char *dst, const char __user *src,
long count);
long __must_check __strncpy_from_user(char *dst,
diff --git a/arch/m32r/kernel/m32r_ksyms.c b/arch/m32r/kernel/m32r_ksyms.c
index d763f0bd2106..a4d43b5cc102 100644
--- a/arch/m32r/kernel/m32r_ksyms.c
+++ b/arch/m32r/kernel/m32r_ksyms.c
@@ -26,8 +26,6 @@ EXPORT_SYMBOL(strncpy_from_user);
EXPORT_SYMBOL(__strncpy_from_user);
EXPORT_SYMBOL(clear_user);
EXPORT_SYMBOL(__clear_user);
-EXPORT_SYMBOL(__generic_copy_from_user);
-EXPORT_SYMBOL(__generic_copy_to_user);
EXPORT_SYMBOL(strnlen_user);
#ifdef CONFIG_SMP
diff --git a/arch/m32r/lib/usercopy.c b/arch/m32r/lib/usercopy.c
index 6aacf5ba0a58..b3ef2c899f96 100644
--- a/arch/m32r/lib/usercopy.c
+++ b/arch/m32r/lib/usercopy.c
@@ -11,28 +11,6 @@
#include <linux/thread_info.h>
#include <linux/uaccess.h>
-unsigned long
-__generic_copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- prefetch(from);
- if (access_ok(VERIFY_WRITE, to, n))
- __copy_user(to,from,n);
- return n;
-}
-
-unsigned long
-__generic_copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- unsigned long ret = n;
- prefetchw(to);
- if (access_ok(VERIFY_READ, from, n))
- ret = __copy_user(to,from,n);
- if (unlikely(ret))
- memset(to + n - ret, 0, ret);
- return ret;
-}
-
-
/*
* Copy a null terminated string from userspace.
*/