diff options
| author |   Peter Zijlstra <a.p.zijlstra@chello.nl> | 2006-12-06 20:32:21 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:21 -0800 |
| commit | ad76fb6b5a5183255279e0ab5260715481770678 (patch) | |
| tree | 31034294d70f5fc3d6166a76fe9b7f8cd19db0fd /include/linux/highmem.h | |
| parent | [PATCH] mm: pagefault_{disable,enable}() (diff) | |
| download | linux-dev-ad76fb6b5a5183255279e0ab5260715481770678.tar.xz linux-dev-ad76fb6b5a5183255279e0ab5260715481770678.zip | |
[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/linux/highmem.h')
| -rw-r--r-- | include/linux/highmem.h | 8 |
1 files changed, 5 insertions, 3 deletions
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 |