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| author | Will Deacon <will.deacon@arm.com> | 2012-07-06 18:45:39 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-07-09 20:41:11 +0400 |
| commit | 8c56cc8be5b38e3684eba96dc9b3f7ca7e495755 (patch) | |
| tree | eccb882c8c5f1cc81fc226c769fc9ec99a45145b /arch/arm/kernel/armksyms.c | |
| parent | 4295b898f5a5c7e62ae68e7a4ecc4b414622ffe6 (diff) | |
| download | linux-8c56cc8be5b38e3684eba96dc9b3f7ca7e495755.tar.xz | |
ARM: 7449/1: use generic strnlen_user and strncpy_from_user functions
This patch implements the word-at-a-time interface for ARM using the
same algorithm as x86. We use the fls macro from ARMv5 onwards, where
we have a clz instruction available which saves us a mov instruction
when targetting Thumb-2. For older CPUs, we use the magic 0x0ff0001
constant. Big-endian configurations make use of the implementation from
asm-generic.
With this implemented, we can replace our byte-at-a-time strnlen_user
and strncpy_from_user functions with the optimised generic versions.
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/armksyms.c')
| -rw-r--r-- | arch/arm/kernel/armksyms.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c index b57c75e0b01f..c3dff6abc89d 100644 --- a/arch/arm/kernel/armksyms.c +++ b/arch/arm/kernel/armksyms.c @@ -87,10 +87,6 @@ EXPORT_SYMBOL(memmove); EXPORT_SYMBOL(memchr); EXPORT_SYMBOL(__memzero); - /* user mem (segment) */ -EXPORT_SYMBOL(__strnlen_user); -EXPORT_SYMBOL(__strncpy_from_user); - #ifdef CONFIG_MMU EXPORT_SYMBOL(copy_page); |