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Commit a1f98849 authored by Nicolas Pitre's avatar Nicolas Pitre
Browse files

[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: default avatarNicolas Pitre <nico@marvell.com>
parent 59a3759d

arch/arm/include/asm/uaccess.h

+2 −0
Original line number Diff line number Diff line
@@ -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)

arch/arm/lib/clear_user.S

+2 −1
Original line number Diff line number Diff line
@@ -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

arch/arm/lib/copy_to_user.S

+2 −1
Original line number Diff line number Diff line
@@ -86,7 +86,8 @@ 


	.text



ENTRY(__copy_to_user)

ENTRY(__copy_to_user_std)

WEAK(__copy_to_user)



#include "copy_template.S"