linux-kernel - [BUGFIX][PATCH] flush icache before set_pte() in ia64 take7, [1/2] migration fix

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Message-Id: <20070807172648.4590c3dd.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 7 Aug 2007 17:26:48 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	"Zoltan.Menyhart@...l.net" <Zoltan.Menyhart@...l.net>
Subject: [BUGFIX][PATCH] flush icache before set_pte() in ia64 take7, [1/2]
 migration fix

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

V6 -> V7:
   * adjusted against .2.6.23-rc2.

V5 -> V6:
   * no changes (added new patches to the patch set)
V4 -> V5:
   * changed flush_icache_page to flush_cache_page.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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

Index: linux-2.6.23-rc2.test/mm/migrate.c
===================================================================
--- linux-2.6.23-rc2.test.orig/mm/migrate.c
+++ linux-2.6.23-rc2.test/mm/migrate.c
@@ -171,6 +171,7 @@ 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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