linux-kernel - [PATCH 47/45] sparc64: Flush TLB before releasing pages.

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Message-ID: <20090402065753.GC18394@sequoia.sous-sol.org>
Date:	Wed, 1 Apr 2009 23:57:53 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	"Theodore Ts'o" <tytso@....edu>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Eugene Teo <eteo@...hat.com>,
	Justin Forbes <jmforbes@...uxtx.org>,
	Domenico Andreoli <cavokz@...il.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Jake Edge <jake@....net>, Randy Dunlap <rdunlap@...otime.net>,
	Michael Krufky <mkrufky@...uxtv.org>, alan@...rguk.ukuu.org.uk,
	Chuck Ebbert <cebbert@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	Willy Tarreau <w@....eu>,
	Rodrigo Rubira Branco <rbranco@...checkpoint.com>,
	davem@...emloft.net
Subject: [PATCH 47/45] sparc64: Flush TLB before releasing pages.

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: David S. Miller <davem@...emloft.net>

[ Upstream commit a552a42cfa91ab653128dff89a70c8dde7fed042 ]

tlb_flush_mmu() needs to flush pending TLB entries before
processing the mmu_gather ->pages list.

Noticed by Benjamin Herrenschmidt.

Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Chris Wright <chrisw@...s-sol.org>
---
 arch/sparc/include/asm/tlb_64.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/sparc/include/asm/tlb_64.h
+++ b/arch/sparc/include/asm/tlb_64.h
@@ -58,6 +58,8 @@ static inline struct mmu_gather *tlb_gat
 static inline void tlb_flush_mmu(struct mmu_gather *mp)
 {
 	if (mp->need_flush) {
+		if (!mp->fullmm)
+			flush_tlb_pending();
 		free_pages_and_swap_cache(mp->pages, mp->pages_nr);
 		mp->pages_nr = 0;
 		mp->need_flush = 0;
@@ -78,8 +80,6 @@ static inline void tlb_finish_mmu(struct
 
 	if (mp->fullmm)
 		mp->fullmm = 0;
-	else
-		flush_tlb_pending();
 
 	/* keep the page table cache within bounds */
 	check_pgt_cache();
--
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