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SubjectRe: [PATCH] add strncmp to PowerPC
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On Fri, 2008-02-29 at 11:04 -0500, Steven Rostedt wrote:
> strncmp is defined in assembly for bootup, but it is not defined in the
> normal running kernel. This patch takes the strncmp code from the bootup
> and copies it to the kernel proper.
>
> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
> ---

Do we have any indication that it performs better than the C one ?

Ben.

> arch/powerpc/kernel/ppc_ksyms.c | 1 +
> arch/powerpc/lib/string.S | 12 ++++++++++++
> include/asm-powerpc/string.h | 2 ++
> 3 files changed, 15 insertions(+)
>
> Index: linux-sched-devel.git/arch/powerpc/kernel/ppc_ksyms.c
> ===================================================================
> --- linux-sched-devel.git.orig/arch/powerpc/kernel/ppc_ksyms.c 2008-02-27 14:01:38.000000000 -0800
> +++ linux-sched-devel.git/arch/powerpc/kernel/ppc_ksyms.c 2008-02-29 07:24:22.000000000 -0800
> @@ -78,6 +78,7 @@ EXPORT_SYMBOL(strncpy);
> EXPORT_SYMBOL(strcat);
> EXPORT_SYMBOL(strlen);
> EXPORT_SYMBOL(strcmp);
> +EXPORT_SYMBOL(strncmp);
>
> EXPORT_SYMBOL(csum_partial);
> EXPORT_SYMBOL(csum_partial_copy_generic);
> Index: linux-sched-devel.git/arch/powerpc/lib/string.S
> ===================================================================
> --- linux-sched-devel.git.orig/arch/powerpc/lib/string.S 2008-02-27 14:01:38.000000000 -0800
> +++ linux-sched-devel.git/arch/powerpc/lib/string.S 2008-02-29 07:24:22.000000000 -0800
> @@ -75,6 +75,18 @@ _GLOBAL(strcmp)
> beq 1b
> blr
>
> +_GLOBAL(strncmp)
> + mtctr r5
> + addi r5,r3,-1
> + addi r4,r4,-1
> +1: lbzu r3,1(r5)
> + cmpwi 1,r3,0
> + lbzu r0,1(r4)
> + subf. r3,r0,r3
> + beqlr 1
> + bdnzt eq,1b
> + blr
> +
> _GLOBAL(strlen)
> addi r4,r3,-1
> 1: lbzu r0,1(r4)
> Index: linux-sched-devel.git/include/asm-powerpc/string.h
> ===================================================================
> --- linux-sched-devel.git.orig/include/asm-powerpc/string.h 2008-02-27 14:01:58.000000000 -0800
> +++ linux-sched-devel.git/include/asm-powerpc/string.h 2008-02-29 07:24:22.000000000 -0800
> @@ -7,6 +7,7 @@
> #define __HAVE_ARCH_STRNCPY
> #define __HAVE_ARCH_STRLEN
> #define __HAVE_ARCH_STRCMP
> +#define __HAVE_ARCH_STRNCMP
> #define __HAVE_ARCH_STRCAT
> #define __HAVE_ARCH_MEMSET
> #define __HAVE_ARCH_MEMCPY
> @@ -18,6 +19,7 @@ extern char * strcpy(char *,const char *
> extern char * strncpy(char *,const char *, __kernel_size_t);
> extern __kernel_size_t strlen(const char *);
> extern int strcmp(const char *,const char *);
> +extern int strncmp(const char *,const char *,__kernel_size_t);
> extern char * strcat(char *, const char *);
> extern void * memset(void *,int,__kernel_size_t);
> extern void * memcpy(void *,const void *,__kernel_size_t);
>
>
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev



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