sparc-Prepare-decoupling-of-page-fault-logic-from-pr.patch

From ab70f1d5819af93e041cbd88dcd310f60b5d83ba Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 3 Jul 2009 08:30:37 -0500
Subject: [PATCH] sparc: Prepare decoupling of page-fault logic from preempt-count

commit ab70f1d5819af93e041cbd88dcd310f60b5d83ba in tip.

With the separation of pagefault_{disable,enable}() from the
preempt_count a previously overlooked dependancy became painfully
clear.

kmap_atomic() is per cpu and relies not only on disabling the
pagefault handler, but really needs preemption disabled too.

Make this explicit now - so that we can change pagefault_disable().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c
index 7916feb..a9f414c 100644
--- a/arch/sparc/mm/highmem.c
+++ b/arch/sparc/mm/highmem.c
@@ -34,7 +34,7 @@ void *kmap_atomic(struct page *page, enum km_type type)
 	unsigned long idx;
 	unsigned long vaddr;
 
-	/* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
+	preempt_disable();
 	pagefault_disable();
 	if (!PageHighMem(page))
 		return page_address(page);
@@ -73,6 +73,7 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
 
 	if (vaddr < FIXADDR_START) { // FIXME
 		pagefault_enable();
+		preempt_enable();
 		return;
 	}
 
@@ -99,6 +100,7 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
 #endif
 
 	pagefault_enable();
+	preempt_enable();
 }
 EXPORT_SYMBOL(kunmap_atomic);
 
-- 
1.7.1.1