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authorMichael Cree <mcree@orcon.net.nz>2012-08-19 06:40:58 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-08-19 19:41:18 +0400
commitf2db633d301b4b50f5f93de0e8314cc81e9bc7de (patch)
treeaafa01b17e83221ca92ee58e66d7e6783808a224 /arch/alpha/lib/Makefile
parentd8d5da129857bfd54b603771fca5409062167392 (diff)
downloadlinux-f2db633d301b4b50f5f93de0e8314cc81e9bc7de.tar.xz
alpha: Use new generic strncpy_from_user() and strnlen_user()
Similar to x86/sparc/powerpc implementations except: 1) we implement an extremely efficient has_zero()/find_zero() sequence with both prep_zero_mask() and create_zero_mask() no-operations. 2) Our output from prep_zero_mask() differs in that only the lowest eight bits are used to represent the zero bytes nevertheless it can be safely ORed with other similar masks from prep_zero_mask() and forms input to create_zero_mask(), the two fundamental properties prep_zero_mask() must satisfy. Tests on EV67 and EV68 CPUs revealed that the generic code is essentially as fast (to within 0.5% of CPU cycles) of the old Alpha specific code for large quadword-aligned strings, despite the 30% extra CPU instructions executed. In contrast, the generic code for unaligned strings is substantially slower (by more than a factor of 3) than the old Alpha specific code. Signed-off-by: Michael Cree <mcree@orcon.net.nz> Acked-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha/lib/Makefile')
-rw-r--r--arch/alpha/lib/Makefile2
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/alpha/lib/Makefile b/arch/alpha/lib/Makefile
index c0a83ab62b78..59660743237c 100644
--- a/arch/alpha/lib/Makefile
+++ b/arch/alpha/lib/Makefile
@@ -31,8 +31,6 @@ lib-y = __divqu.o __remqu.o __divlu.o __remlu.o \
$(ev6-y)memchr.o \
$(ev6-y)copy_user.o \
$(ev6-y)clear_user.o \
- $(ev6-y)strncpy_from_user.o \
- $(ev67-y)strlen_user.o \
$(ev6-y)csum_ipv6_magic.o \
$(ev6-y)clear_page.o \
$(ev6-y)copy_page.o \