Commit 39c29657 authored by Doug Thompson's avatar Doug Thompson Committed by Linus Torvalds

include/asm-:mips add missing edac h file

EDAC has a foundation to perform software memory scrubbing, but it requires a
per architecture (atomic_scrub) function for performing an atomic update
operation.  Under X86, this is done with a

lock:  add  [addr],0

in the file asm-x86/edac.h

This patch provides the MIPS arch with that atomic function, atomic_scrub() in

asm-mips/edac.h

Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: default avatarDoug Thompson <dougthompson@xmission.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d4c1465b
#ifndef ASM_EDAC_H
#define ASM_EDAC_H
/* ECC atomic, DMA, SMP and interrupt safe scrub function */
static inline void atomic_scrub(void *va, u32 size)
{
unsigned long *virt_addr = va;
unsigned long temp;
u32 i;
for (i = 0; i < size / sizeof(unsigned long); i++, virt_addr++) {
/*
* Very carefully read and write to memory atomically
* so we are interrupt, DMA and SMP safe.
*
* Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
*/
__asm__ __volatile__ (
" .set mips3 \n"
"1: ll %0, %1 # atomic_add \n"
" ll %0, %1 # atomic_add \n"
" addu %0, $0 \n"
" sc %0, %1 \n"
" beqz %0, 1b \n"
" .set mips0 \n"
: "=&r" (temp), "=m" (*virt_addr)
: "m" (*virt_addr));
}
}
#endif
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