linux-kernel - [PATCH mm] stop c_p

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Message-ID: <Pine.LNX.4.64.0802052226140.11822@blonde.site>
Date:	Tue, 5 Feb 2008 22:27:21 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org
Subject: [PATCH mm] stop c_p_a corrupting the pds

When change_page_attr splits a large page on x86_32 (without PAE), it is
currently corrupting every process's page directory: fix that by removing
the thinko which passes down a physical instead of a virtual address -
this version of the patch being the hotfix for 2.6.24-mm1.

Signed-off-by: Hugh Dickins <hugh@...itas.com>

--- 2.6.24-mm1/arch/x86/mm/pageattr.c	2008-02-04 12:25:09.000000000 +0000
+++ linux/arch/x86/mm/pageattr.c	2008-02-05 20:52:43.000000000 +0000
@@ -218,8 +218,7 @@ static int split_large_page(pte_t *kpte,
 		goto out_unlock;
 	}
 
-	address = __pa(address);
-	addr = address & LARGE_PAGE_MASK;
+	addr = __pa(address) & LARGE_PAGE_MASK;
 	pbase = (pte_t *)page_address(base);
 #ifdef CONFIG_X86_32
 	paravirt_alloc_pt(&init_mm, page_to_pfn(base));
--
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