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author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2015-07-13 04:17:07 (GMT) |
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committer | Simon Glass <sjg@chromium.org> | 2015-07-22 13:30:44 (GMT) |
commit | 6b9f9eadffb5f64801746593784e12f07f2fadd0 (patch) | |
tree | a7175969f30db000d6d1bcc049e5f2a55e042314 | |
parent | ebc3328cccc2bc7968fbd179e8e30fa1282b391a (diff) | |
download | u-boot-6b9f9eadffb5f64801746593784e12f07f2fadd0.tar.xz |
linux_compat: handle __GFP_ZERO in kmalloc()
Currently, kzalloc() returns zero-filled memory, while kmalloc()
simply ignores the second argument and never fills the memory
area with zeros.
I want kmalloc(size, __GFP_ZERO) to behave as kzalloc() does,
which will make it easier to add more memory allocator variants.
With the introduction of __GFP_ZERO flag, going forward, kzmalloc()
variants can fall back to kmalloc() enabling the __GFP_ZERO flag.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Acked-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
-rw-r--r-- | include/linux/compat.h | 20 | ||||
-rw-r--r-- | lib/linux_compat.c | 13 |
2 files changed, 18 insertions, 15 deletions
diff --git a/include/linux/compat.h b/include/linux/compat.h index a3d136b..fbebf91 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -36,8 +36,19 @@ extern struct p_current *current; #define KERN_INFO #define KERN_DEBUG +#define GFP_ATOMIC ((gfp_t) 0) +#define GFP_KERNEL ((gfp_t) 0) +#define GFP_NOFS ((gfp_t) 0) +#define GFP_USER ((gfp_t) 0) +#define __GFP_NOWARN ((gfp_t) 0) +#define __GFP_ZERO ((__force gfp_t)0x8000u) /* Return zeroed page on success */ + void *kmalloc(size_t size, int flags); -void *kzalloc(size_t size, int flags); + +static inline void *kzalloc(size_t size, gfp_t flags) +{ + return kmalloc(size, flags | __GFP_ZERO); +} #define vmalloc(size) kmalloc(size, 0) #define __vmalloc(size, flags, pgsz) kmalloc(size, flags) static inline void *vzalloc(unsigned long size) @@ -77,13 +88,6 @@ void *kmem_cache_alloc(struct kmem_cache *obj, int flag); /* drivers/char/random.c */ #define get_random_bytes(...) -/* idr.c */ -#define GFP_ATOMIC ((gfp_t) 0) -#define GFP_KERNEL ((gfp_t) 0) -#define GFP_NOFS ((gfp_t) 0) -#define GFP_USER ((gfp_t) 0) -#define __GFP_NOWARN ((gfp_t) 0) - /* include/linux/leds.h */ struct led_trigger {}; diff --git a/lib/linux_compat.c b/lib/linux_compat.c index 8c7a7b5..a936a7e 100644 --- a/lib/linux_compat.c +++ b/lib/linux_compat.c @@ -16,14 +16,13 @@ unsigned long copy_from_user(void *dest, const void *src, void *kmalloc(size_t size, int flags) { - return memalign(ARCH_DMA_MINALIGN, size); -} + void *p; -void *kzalloc(size_t size, int flags) -{ - void *ptr = kmalloc(size, flags); - memset(ptr, 0, size); - return ptr; + p = memalign(ARCH_DMA_MINALIGN, size); + if (flags & __GFP_ZERO) + memset(p, 0, size); + + return p; } struct kmem_cache *get_mem(int element_sz) |