diff options
| author | Pavel Tatashin <pasha.tatashin@oracle.com> | 2017-05-09 09:48:04 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2017-05-09 13:25:02 +1000 |
| commit | b9b27aad7b9803135023912431daa84c2064fa6a (patch) | |
| tree | 08d8ac631aeb4882eb5557467e0e00ca866471b9 /include | |
| parent | 4ca2ac685333c34886cc9227251345ea3564b956 (diff) | |
mm: zero hash tables in allocator
Add a new flag HASH_ZERO which when provided grantees that the hash table
that is returned by alloc_large_system_hash() is zeroed. In most cases
that is what is needed by the caller. Use page level allocator's
__GFP_ZERO flags to zero the memory. It is using memset() which is
efficient method to zero memory and is optimized for most platforms.
Link: http://lkml.kernel.org/r/1488432825-92126-3-git-send-email-pasha.tatashin@oracle.com
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Babu Moger <babu.moger@oracle.com>
Cc: David Miller <davem@davemloft.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bootmem.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h index 962164d36506..e223d91b6439 100644 --- a/include/linux/bootmem.h +++ b/include/linux/bootmem.h @@ -358,6 +358,7 @@ extern void *alloc_large_system_hash(const char *tablename, #define HASH_EARLY 0x00000001 /* Allocating during early boot? */ #define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min * shift passed via *_hash_shift */ +#define HASH_ZERO 0x00000004 /* Zero allocated hash table */ /* Only NUMA needs hash distribution. 64bit NUMA architectures have * sufficient vmalloc space. |