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

include/asm-mips/edac.h

0 → 100644
+35 −0
Original line number Diff line number Diff line 
#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