include/asm-:mips add missing edac h file (39c29657) · Commits · 戴 / test

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:

Doug Thompson <dougthompson@xmission.com> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

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

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