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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2006-12-06 20:32:21 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:21 -0800
commitad76fb6b5a5183255279e0ab5260715481770678 (patch)
tree31034294d70f5fc3d6166a76fe9b7f8cd19db0fd /include
parenta866374aecc90c7d90619727ccd851ac096b2fc7 (diff)
downloadlinux-ad76fb6b5a5183255279e0ab5260715481770678.tar.gz
[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>
Diffstat (limited to 'include')
-rw-r--r--include/asm-mips/highmem.h10
-rw-r--r--include/linux/highmem.h8
2 files changed, 13 insertions, 5 deletions
diff --git a/include/asm-mips/highmem.h b/include/asm-mips/highmem.h
index c976bfaaba83..f8c8182f7f2e 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)
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index fd7d12daa94f..3d8768b619e9 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -3,6 +3,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
+#include <linux/uaccess.h>
#include <asm/cacheflush.h>
@@ -41,9 +42,10 @@ static inline void *kmap(struct page *page)
#define kunmap(page) do { (void) (page); } while (0)
-#define kmap_atomic(page, idx) page_address(page)
-#define kunmap_atomic(addr, idx) do { } while (0)
-#define kmap_atomic_pfn(pfn, idx) page_address(pfn_to_page(pfn))
+#define kmap_atomic(page, idx) \
+ ({ pagefault_disable(); page_address(page); })
+#define kunmap_atomic(addr, idx) do { pagefault_enable(); } while (0)
+#define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx))
#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
#endif