linux-kernel - Re: [PATCH](retry 2) Re: invalidate caches before going into suspend

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Message-ID: <20080813114229.118be446@infradead.org>
Date:	Wed, 13 Aug 2008 11:42:29 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Mark Langsdorf <mark.langsdorf@....com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH](retry 2) Re: invalidate caches before going into
 suspend

On Wed, 13 Aug 2008 13:33:17 -0500
Mark Langsdorf <mark.langsdorf@....com> wrote:
> +	/* mask all interrupts, flush any and all caches, and halt */
> +	if (cpu_has_clflush)
> +		wbinvd_halt();
> +	else
> +		while (1)
> +			halt();
>  }

I like the asm version .. but this code makes me blink.
when you HAVE clflush you do wbinvd.
yeah I know it's correct but... it reads wonky ;)
also.. can we move that check into the wbinvd_halt() itself, so that
the callers don't need to care what is used to select it ?

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