diff options
| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-26 10:14:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-26 10:14:39 -0700 |
| commit | 4ae73f2d53255c388d50bf83c1681112a6f9cba1 (patch) | |
| tree | 0b0d9adce97c2270a427e1f1c19c977b8f066d5b /arch/x86/Kconfig | |
| parent | Merge tag 'tag-for-linus-3.5' of git://git.linaro.org/people/sumitsemwal/linux-dma-buf (diff) | |
| download | linux-dev-4ae73f2d53255c388d50bf83c1681112a6f9cba1.tar.xz linux-dev-4ae73f2d53255c388d50bf83c1681112a6f9cba1.zip | |
x86: use generic strncpy_from_user routine
The generic strncpy_from_user() is not really optimal, since it is
designed to work on both little-endian and big-endian. And on
little-endian you can simplify much of the logic to find the first zero
byte, since little-endian arithmetic doesn't have to worry about the
carry bit propagating into earlier bytes (only later bytes, which we
don't care about).
But I have patches to make the generic routines use the architecture-
specific <asm/word-at-a-time.h> infrastructure, so that we can regain
the little-endian optimizations. But before we do that, switch over to
the generic routines to make the patches each do just one well-defined
thing.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 81c3e8be789a..3220d44e24d0 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -93,6 +93,7 @@ config X86 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) select GENERIC_TIME_VSYSCALL if X86_64 select KTIME_SCALAR if X86_32 + select GENERIC_STRNCPY_FROM_USER config INSTRUCTION_DECODER def_bool (KPROBES || PERF_EVENTS || UPROBES) |