linux-kernel - Re: [PATCH] [12/31] CPA: CLFLUSH support in change_page

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Date:	Tue, 15 Jan 2008 08:40:27 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<ak@...e.de>
Cc:	<mingo@...e.hu>, <tglx@...utronix.de>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [12/31] CPA: CLFLUSH support in change_page_attr()

>-	/* clflush is still broken. Disable for now. */
>-	if (1 || !cpu_has_clflush)
>+	if (a->full_flush)
> 		asm volatile("wbinvd" ::: "memory");
>-	else list_for_each_entry(pg, l, lru) {
>-		void *adr = page_address(pg);
>-		clflush_cache_range(adr, PAGE_SIZE);
>+	list_for_each_entry(f, &a->l, l) {
>+		if (!a->full_flush)

This if() looks redundant (could also be avoided in the 32-bit variant, but
isn't redundant there at present). Also, is there no
wbinvd() on 64bit?

Jan

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