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authorLinus Torvalds <torvalds@linux-foundation.org>2012-05-26 10:14:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-26 10:14:39 -0700
commit4ae73f2d53255c388d50bf83c1681112a6f9cba1 (patch)
tree0b0d9adce97c2270a427e1f1c19c977b8f066d5b /arch/x86/Kconfig
parentda89fb165e5e51a2ec1ff8a0ff6bc052d1068184 (diff)
downloadop-kernel-dev-4ae73f2d53255c388d50bf83c1681112a6f9cba1.zip
op-kernel-dev-4ae73f2d53255c388d50bf83c1681112a6f9cba1.tar.gz
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/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 81c3e8b..3220d44 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)
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