linux-kernel - Re: [PATCH 3/4] include asm-mips add missing edac h file

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Message-Id: <20070725222500.e537531d.akpm@linux-foundation.org>
Date:	Wed, 25 Jul 2007 22:25:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	dougthompson@...ssion.com
Cc:	greg@...ah.com, ralf@...ux-mips.org, egor@...emi.com,
	alan@...rguk.ukuu.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] include asm-mips add missing edac h file

On Wed, 25 Jul 2007 14:55:01 -0600 dougthompson@...ssion.com wrote:

> --- /dev/null
> +++ linux-2.6.23-rc1/include/asm-mips/edac.h
> @@ -0,0 +1,35 @@
> +#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)

Please don't use __inline__ or __inline.  Good old "inline" will do.

<cc's the checkpatch maintainer>

<edits the diff>

> +{
> +	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));
> +
> +	}
> +}

hm, I'd have thought that we could us plain old atomic_add() for this.
-
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