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| author | Peter Zijlstra | 2006-12-07 05:32:21 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2006-12-07 17:39:21 +0100 |
| commit | ad76fb6b5a5183255279e0ab5260715481770678 (patch) | |
| tree | 31034294d70f5fc3d6166a76fe9b7f8cd19db0fd | |
| parent | [PATCH] mm: pagefault_{disable,enable}() (diff) | |
| download | kernel-qcow2-linux-ad76fb6b5a5183255279e0ab5260715481770678.tar.gz kernel-qcow2-linux-ad76fb6b5a5183255279e0ab5260715481770678.tar.xz kernel-qcow2-linux-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>
| -rw-r--r-- | include/asm-mips/highmem.h | 10 | ||||
| -rw-r--r-- | include/linux/highmem.h | 8 |
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 |