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[ARM] allow for alternative __copy_to_user/__clear_user implementations 

This allows for optional alternative implementations of __copy_to_user
and __clear_user, with a possible runtime fallback to the standard
version when the alternative provides no gain over that standard
version. This is done by making the standard __copy_to_user into a weak
alias for the symbol __copy_to_user_std.  Same thing for __clear_user.

Those two functions are particularly good candidates to have alternative
implementations for, since they rely on the STRT instruction which has
lower performances than STM instructions on some CPU cores such as
the ARM1176 and Marvell Feroceon.

Signed-off-by: Nicolas Pitre <nico@marvell.com>
This commit is contained in:
Nicolas Pitre 2009-03-08 22:34:45 -04:00
parent 59a3759d0f
commit a1f98849fd
3 changed files with 6 additions and 2 deletions
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2
arch/arm/include/asm/uaccess.h
View File

@ -386,7 +386,9 @@ do { \
#ifdef CONFIG_MMU
extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
extern unsigned long __must_check __copy_to_user_std(void __user *to, const void *from, unsigned long n);
extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
extern unsigned long __must_check __clear_user_std(void __user *addr, unsigned long n);
#else
#define __copy_from_user(to,from,n) (memcpy(to, (void __force *)from, n), 0)
#define __copy_to_user(to,from,n) (memcpy((void __force *)to, from, n), 0)

3
arch/arm/lib/clear_user.S
View File

@ -18,7 +18,8 @@
* : sz - number of bytes to clear
* Returns : number of bytes NOT cleared
*/
ENTRY(__clear_user)
ENTRY(__clear_user_std)
WEAK(__clear_user)
stmfd sp!, {r1, lr}
mov r2, #0
cmp r1, #4

3
arch/arm/lib/copy_to_user.S
View File

@ -86,7 +86,8 @@
.text
ENTRY(__copy_to_user)
ENTRY(__copy_to_user_std)
WEAK(__copy_to_user)
#include "copy_template.S"