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xfs: simplify kmem_{zone_}zalloc 

Introduce flag KM_ZERO which is used to alloc zeroed entry, and convert
kmem_{zone_}zalloc to call kmem_{zone_}alloc() with KM_ZERO directly,
in order to avoid the setting to zero step. 
And following Dave's suggestion, make kmem_{zone_}zalloc static inline
into kmem.h as they're now just a simple wrapper.

V2:
  Make kmem_{zone_}zalloc static inline into kmem.h as Dave suggested.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Gu Zheng 2013-11-04 18:21:05 +08:00 committed by Ben Myers
parent d123031a56
commit 359d992bcd
2 changed files with 18 additions and 25 deletions
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22
fs/xfs/kmem.c
View File

@ -62,17 +62,6 @@ kmem_alloc(size_t size, xfs_km_flags_t flags)
} while (1); } while (1);
} }
void *
kmem_zalloc(size_t size, xfs_km_flags_t flags)
{
void *ptr;
ptr = kmem_alloc(size, flags);
if (ptr)
memset((char *)ptr, 0, (int)size);
return ptr;
}
void * void *
kmem_zalloc_large(size_t size, xfs_km_flags_t flags) kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
{ {
@ -128,14 +117,3 @@ kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags)
congestion_wait(BLK_RW_ASYNC, HZ/50); congestion_wait(BLK_RW_ASYNC, HZ/50);
} while (1); } while (1);
} }
void *
kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
{
void *ptr;
ptr = kmem_zone_alloc(zone, flags);
if (ptr)
memset((char *)ptr, 0, kmem_cache_size(zone));
return ptr;
}

21
fs/xfs/kmem.h
View File

@ -32,6 +32,7 @@ typedef unsigned __bitwise xfs_km_flags_t;
#define KM_NOSLEEP ((__force xfs_km_flags_t)0x0002u) #define KM_NOSLEEP ((__force xfs_km_flags_t)0x0002u)
#define KM_NOFS ((__force xfs_km_flags_t)0x0004u) #define KM_NOFS ((__force xfs_km_flags_t)0x0004u)
#define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u) #define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u)
#define KM_ZERO ((__force xfs_km_flags_t)0x0010u)
/* /*
* We use a special process flag to avoid recursive callbacks into * We use a special process flag to avoid recursive callbacks into
@ -43,7 +44,7 @@ kmem_flags_convert(xfs_km_flags_t flags)
{ {
gfp_t lflags; gfp_t lflags;
BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL)); BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_ZERO));
if (flags & KM_NOSLEEP) { if (flags & KM_NOSLEEP) {
lflags = GFP_ATOMIC | __GFP_NOWARN; lflags = GFP_ATOMIC | __GFP_NOWARN;
@ -52,11 +53,14 @@ kmem_flags_convert(xfs_km_flags_t flags)
if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
lflags &= ~__GFP_FS; lflags &= ~__GFP_FS;
} }
if (flags & KM_ZERO)
lflags |= __GFP_ZERO;
return lflags; return lflags;
} }
extern void *kmem_alloc(size_t, xfs_km_flags_t); extern void *kmem_alloc(size_t, xfs_km_flags_t);
extern void *kmem_zalloc(size_t, xfs_km_flags_t);
extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t); extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t); extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t);
extern void kmem_free(const void *); extern void kmem_free(const void *);
@ -64,6 +68,12 @@ extern void kmem_free(const void *);
extern void *kmem_zalloc_greedy(size_t *, size_t, size_t); extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
static inline void *
kmem_zalloc(size_t size, xfs_km_flags_t flags)
{
return kmem_alloc(size, flags | KM_ZERO);
}
/* /*
* Zone interfaces * Zone interfaces
*/ */
@ -102,6 +112,11 @@ kmem_zone_destroy(kmem_zone_t *zone)
} }
extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t); extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
extern void *kmem_zone_zalloc(kmem_zone_t *, xfs_km_flags_t);
static inline void *
kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
{
return kmem_zone_alloc(zone, flags | KM_ZERO);
}
#endif /* __XFS_SUPPORT_KMEM_H__ */ #endif /* __XFS_SUPPORT_KMEM_H__ */