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authorNick Piggin <npiggin@suse.de>2008-09-10 13:37:17 +0200
committerIngo Molnar <mingo@elte.hu>2008-09-11 09:44:21 +0200
commit3ee1afa308f2a38e5d1e2ad3752ad7abcf480da1 (patch)
tree914e0f3bbd32a387cf6095c6955369fa8da7ebf6 /arch/x86/lib
parentc10d38dda1774ed4540380333cabd229eff37094 (diff)
downloadop-kernel-dev-3ee1afa308f2a38e5d1e2ad3752ad7abcf480da1.zip
op-kernel-dev-3ee1afa308f2a38e5d1e2ad3752ad7abcf480da1.tar.gz
x86: some lock annotations for user copy paths, v2
- introduce might_fault() - handle the atomic user copy paths correctly [ mingo@elte.hu: move might_sleep() outside of in_atomic(). ] Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/usercopy_32.c12
-rw-r--r--arch/x86/lib/usercopy_64.c8
2 files changed, 5 insertions, 15 deletions
diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c
index 8eedde2..7393152 100644
--- a/arch/x86/lib/usercopy_32.c
+++ b/arch/x86/lib/usercopy_32.c
@@ -32,9 +32,7 @@ static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned lon
#define __do_strncpy_from_user(dst, src, count, res) \
do { \
int __d0, __d1, __d2; \
- might_sleep(); \
- if (current->mm) \
- might_lock_read(&current->mm->mmap_sem); \
+ might_fault(); \
__asm__ __volatile__( \
" testl %1,%1\n" \
" jz 2f\n" \
@@ -121,9 +119,7 @@ EXPORT_SYMBOL(strncpy_from_user);
#define __do_clear_user(addr,size) \
do { \
int __d0; \
- might_sleep(); \
- if (current->mm) \
- might_lock_read(&current->mm->mmap_sem); \
+ might_fault(); \
__asm__ __volatile__( \
"0: rep; stosl\n" \
" movl %2,%0\n" \
@@ -193,9 +189,7 @@ long strnlen_user(const char __user *s, long n)
unsigned long mask = -__addr_ok(s);
unsigned long res, tmp;
- might_sleep();
- if (current->mm)
- might_lock_read(&current->mm->mmap_sem);
+ might_fault();
__asm__ __volatile__(
" testl %0, %0\n"
diff --git a/arch/x86/lib/usercopy_64.c b/arch/x86/lib/usercopy_64.c
index 847d129..64d6c84 100644
--- a/arch/x86/lib/usercopy_64.c
+++ b/arch/x86/lib/usercopy_64.c
@@ -15,9 +15,7 @@
#define __do_strncpy_from_user(dst,src,count,res) \
do { \
long __d0, __d1, __d2; \
- might_sleep(); \
- if (current->mm) \
- might_lock_read(&current->mm->mmap_sem); \
+ might_fault(); \
__asm__ __volatile__( \
" testq %1,%1\n" \
" jz 2f\n" \
@@ -66,9 +64,7 @@ EXPORT_SYMBOL(strncpy_from_user);
unsigned long __clear_user(void __user *addr, unsigned long size)
{
long __d0;
- might_sleep();
- if (current->mm)
- might_lock_read(&current->mm->mmap_sem);
+ might_fault();
/* no memory constraint because it doesn't change any memory gcc knows
about */
asm volatile(
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