From ad76fb6b5a5183255279e0ab5260715481770678 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Wed, 6 Dec 2006 20:32:21 -0800
Subject: [PATCH] mm: k{,um}map_atomic() vs in_atomic()

Make kmap_atomic/kunmap_atomic denote a pagefault disabled scope.  All non
trivial implementations already do this anyway.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 include/asm-mips/highmem.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'include/asm-mips')

diff --git a/include/asm-mips/highmem.h b/include/asm-mips/highmem.h
index c976bfaaba8..f8c8182f7f2 100644
--- a/include/asm-mips/highmem.h
+++ b/include/asm-mips/highmem.h
@@ -21,6 +21,7 @@
 
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/uaccess.h>
 #include <asm/kmap_types.h>
 
 /* undef for production */
@@ -70,11 +71,16 @@ static inline void *kmap(struct page *page)
 
 static inline void *kmap_atomic(struct page *page, enum km_type type)
 {
+	pagefault_disable();
 	return page_address(page);
 }
 
-static inline void kunmap_atomic(void *kvaddr, enum km_type type) { }
-#define kmap_atomic_pfn(pfn, idx)	page_address(pfn_to_page(pfn))
+static inline void kunmap_atomic(void *kvaddr, enum km_type type)
+{
+	pagefault_enable();
+}
+
+#define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx))
 
 #define kmap_atomic_to_page(ptr) virt_to_page(ptr)
 
-- 
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