diff options
| -rw-r--r-- | include/linux/highmem.h | 52 |
1 files changed, 46 insertions, 6 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 3a93f73a8acc..11617a835cf2 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -109,20 +109,60 @@ static inline void kmap_atomic_idx_pop(void) #endif /* - * Make both: kmap_atomic(page, idx) and kmap_atomic(page) work. + * NOTE: + * kmap_atomic() and kunmap_atomic() with two arguments are deprecated. + * We only keep them for backward compatibility, any usage of them + * are now warned. */ -#define kmap_atomic(page, args...) __kmap_atomic(page) + +#define PASTE(a, b) a ## b +#define PASTE2(a, b) PASTE(a, b) + +#define NARG_(_2, _1, n, ...) n +#define NARG(...) NARG_(__VA_ARGS__, 2, 1, :) + +static inline void *kmap_atomic(struct page *page) +{ + return __kmap_atomic(page); +} + +static inline void __deprecated *kmap_atomic_deprecated(struct page *page, + enum km_type km) +{ + return __kmap_atomic(page); +} + +#define kmap_atomic1(...) kmap_atomic(__VA_ARGS__) +#define kmap_atomic2(...) kmap_atomic_deprecated(__VA_ARGS__) +#define kmap_atomic(...) PASTE2(kmap_atomic, NARG(__VA_ARGS__)(__VA_ARGS__)) + +static inline void __deprecated __kunmap_atomic_deprecated(void *addr, + enum km_type km) +{ + __kunmap_atomic(addr); +} /* * Prevent people trying to call kunmap_atomic() as if it were kunmap() * kunmap_atomic() should get the return value of kmap_atomic, not the page. */ -#define kunmap_atomic(addr, args...) \ -do { \ - BUILD_BUG_ON(__same_type((addr), struct page *)); \ - __kunmap_atomic(addr); \ +#define kunmap_atomic_deprecated(addr, km) \ +do { \ + BUILD_BUG_ON(__same_type((addr), struct page *)); \ + __kunmap_atomic_deprecated(addr, km); \ } while (0) +#define kunmap_atomic_withcheck(addr) \ +do { \ + BUILD_BUG_ON(__same_type((addr), struct page *)); \ + __kunmap_atomic(addr); \ +} while (0) + +#define kunmap_atomic1(...) kunmap_atomic_withcheck(__VA_ARGS__) +#define kunmap_atomic2(...) kunmap_atomic_deprecated(__VA_ARGS__) +#define kunmap_atomic(...) PASTE2(kunmap_atomic, NARG(__VA_ARGS__)(__VA_ARGS__)) +/**** End of C pre-processor tricks for deprecated macros ****/ + /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ #ifndef clear_user_highpage static inline void clear_user_highpage(struct page *page, unsigned long vaddr) |