[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>

diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 7897464e0c24260fe002e0ffac839444c35d5079..0da9bc9b3b1dfbc3fe519a373633fae8a96ba4e9 100644 (file)
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -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)

diff --git a/arch/arm/lib/clear_user.S b/arch/arm/lib/clear_user.S
index 4d6bc71231f3a2da61bc2f88a6860ba18e074e59..844f56785ebc539c684d04185a93f5323a6ed7c2 100644 (file)
--- a/arch/arm/lib/clear_user.S
+++ b/arch/arm/lib/clear_user.S
@@ -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

diff --git a/arch/arm/lib/copy_to_user.S b/arch/arm/lib/copy_to_user.S
index 22f968bbdffda4172b783ea7cf4c91899b2f02b6..878820f0a32014974550b60acdcf2cb49a430021 100644 (file)
--- a/arch/arm/lib/copy_to_user.S
+++ b/arch/arm/lib/copy_to_user.S
@@ -86,7 +86,8 @@
 
        .text
 
-ENTRY(__copy_to_user)
+ENTRY(__copy_to_user_std)
+WEAK(__copy_to_user)
 
 #include "copy_template.S"