Commit 5799b255 authored by Johannes Thumshirn's avatar Johannes Thumshirn Committed by Linus Torvalds

include/linux/slab.h: add kmalloc_array_node() and kcalloc_node()

Patch series "Add kmalloc_array_node() and kcalloc_node()".

Our current memeory allocation routines suffer form an API imbalance,
for one we have kmalloc_array() and kcalloc() which check for overflows
in size multiplication and we have kmalloc_node() and kzalloc_node()
which allow for memory allocation on a certain NUMA node but don't check
for eventual overflows.

This patch (of 6):

We have kmalloc_array() and kcalloc() wrappers on top of kmalloc() which
ensure us overflow free multiplication for the size of a memory
allocation but these implementations are not NUMA-aware.

Likewise we have kmalloc_node() which is a NUMA-aware version of
kmalloc() but the implementation is not aware of any possible overflows
in eventual size calculations.

Introduce a combination of the two above cases to have a NUMA-node aware
version of kmalloc_array() and kcalloc().

Link: default avatarJohannes Thumshirn <>
Acked-by: default avatarVlastimil Babka <>
Cc: Christoph Hellwig <>
Cc: Christoph Lameter <>
Cc: Damien Le Moal <>
Cc: David Rientjes <>
Cc: "David S. Miller" <>
Cc: Doug Ledford <>
Cc: Hal Rosenstock <>
Cc: Jens Axboe <>
Cc: Joonsoo Kim <>
Cc: Mike Marciniszyn <>
Cc: Pekka Enberg <>
Cc: Santosh Shilimkar <>
Cc: Sean Hefty <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 11066386
......@@ -650,6 +650,22 @@ extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
#define kmalloc_track_caller(size, flags) \
__kmalloc_track_caller(size, flags, _RET_IP_)
static inline void *kmalloc_array_node(size_t n, size_t size, gfp_t flags,
int node)
if (size != 0 && n > SIZE_MAX / size)
return NULL;
if (__builtin_constant_p(n) && __builtin_constant_p(size))
return kmalloc_node(n * size, flags, node);
return __kmalloc_node(n * size, flags, node);
static inline void *kcalloc_node(size_t n, size_t size, gfp_t flags, int node)
return kmalloc_array_node(n, size, flags | __GFP_ZERO, node);
extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long);
#define kmalloc_node_track_caller(size, flags, node) \
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