diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-02-28 10:35:09 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-02-28 10:35:09 -0800 |
commit | a7f16d10b510f9ee3500af7831f2e3094fab3dca (patch) | |
tree | bd2bff5e13083e1103205ff926342d6674f8e5c5 /arch/x86/include/asm/uaccess_64.h | |
parent | f66ffdedbf0fc059a92219bb08c1dbcac88f074b (diff) | |
parent | 17c0e7107bed3d578864e6519f7f4e4c324c8f58 (diff) | |
download | linux-stable-a7f16d10b510f9ee3500af7831f2e3094fab3dca.tar.gz linux-stable-a7f16d10b510f9ee3500af7831f2e3094fab3dca.tar.bz2 linux-stable-a7f16d10b510f9ee3500af7831f2e3094fab3dca.zip |
Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86: Mark atomic irq ops raw for 32bit legacy
x86: Merge show_regs()
x86: Macroise x86 cache descriptors
x86-32: clean up rwsem inline asm statements
x86: Merge asm/atomic_{32,64}.h
x86: Sync asm/atomic_32.h and asm/atomic_64.h
x86: Split atomic64_t functions into seperate headers
x86-64: Modify memcpy()/memset() alternatives mechanism
x86-64: Modify copy_user_generic() alternatives mechanism
x86: Lift restriction on the location of FIX_BTMAP_*
x86, core: Optimize hweight32()
Diffstat (limited to 'arch/x86/include/asm/uaccess_64.h')
-rw-r--r-- | arch/x86/include/asm/uaccess_64.h | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h index 535e421498f6..316708d5af92 100644 --- a/arch/x86/include/asm/uaccess_64.h +++ b/arch/x86/include/asm/uaccess_64.h @@ -8,6 +8,8 @@ #include <linux/errno.h> #include <linux/prefetch.h> #include <linux/lockdep.h> +#include <asm/alternative.h> +#include <asm/cpufeature.h> #include <asm/page.h> /* @@ -16,7 +18,24 @@ /* Handles exceptions in both to and from, but doesn't do access_ok */ __must_check unsigned long -copy_user_generic(void *to, const void *from, unsigned len); +copy_user_generic_string(void *to, const void *from, unsigned len); +__must_check unsigned long +copy_user_generic_unrolled(void *to, const void *from, unsigned len); + +static __always_inline __must_check unsigned long +copy_user_generic(void *to, const void *from, unsigned len) +{ + unsigned ret; + + alternative_call(copy_user_generic_unrolled, + copy_user_generic_string, + X86_FEATURE_REP_GOOD, + ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from), + "=d" (len)), + "1" (to), "2" (from), "3" (len) + : "memory", "rcx", "r8", "r9", "r10", "r11"); + return ret; +} __must_check unsigned long _copy_to_user(void __user *to, const void *from, unsigned len); |