linux-kernel - [PATCH] flush icache before set_pte() take 5. [1/2] cache flush in migration

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Message-Id: <20070728151449.f3ec0ebe.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Sat, 28 Jul 2007 15:14:49 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Zoltan.Menyhart@...l.net,
	"nickpiggin@...oo.com.au" <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>
Subject: [PATCH] flush icache before set_pte() take 5. [1/2] cache flush in
 migration

In migration, a new page should be cache flushed before set_pte()
in some archs which have virtually-tagged cache..

V4 -> V5:
   * changed flush_icache_page to flush_cache_page.

Signed-Off-By: KAMEZAWA Hiruyoki <kamezawa.hiroyu@...fujitsu.com>

---
 mm/migrate.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6.23-rc1.test/mm/migrate.c
===================================================================
--- linux-2.6.23-rc1.test.orig/mm/migrate.c
+++ linux-2.6.23-rc1.test/mm/migrate.c
@@ -172,6 +172,7 @@ static void remove_migration_pte(struct 
 	pte = pte_mkold(mk_pte(new, vma->vm_page_prot));
 	if (is_write_migration_entry(entry))
 		pte = pte_mkwrite(pte);
+	flush_cache_page(vma, addr, pte_pfn(pte));
 	set_pte_at(mm, addr, ptep, pte);
 
 	if (PageAnon(new))

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