diff options
| author | Danilo Krummrich <dakr@kernel.org> | 2024-08-13 00:34:35 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-03 21:15:37 -0700 |
| commit | 489a744e5fb16503b495ad1fa3dd1abf25b224e7 (patch) | |
| tree | 3bf8daea81e7f162b13f84a6c1a20459d0d5f207 /include/linux | |
| parent | 1a83a716ec233990e1fd5b6fbb1200ade63bf450 (diff) | |
| download | lwn-489a744e5fb16503b495ad1fa3dd1abf25b224e7.tar.gz lwn-489a744e5fb16503b495ad1fa3dd1abf25b224e7.zip | |
mm: krealloc: clarify valid usage of __GFP_ZERO
Properly document that if __GFP_ZERO logic is requested, callers must
ensure that, starting with the initial memory allocation, every subsequent
call to this API for the same memory allocation is flagged with
__GFP_ZERO. Otherwise, it is possible that __GFP_ZERO is not fully
honored by this API.
Link: https://lkml.kernel.org/r/20240812223707.32049-2-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/slab.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h index c9cb42203183..2282e67a01c7 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -733,6 +733,16 @@ static inline __alloc_size(1, 2) void *kmalloc_array_noprof(size_t n, size_t siz * @new_n: new number of elements to alloc * @new_size: new size of a single member of the array * @flags: the type of memory to allocate (see kmalloc) + * + * If __GFP_ZERO logic is requested, callers must ensure that, starting with the + * initial memory allocation, every subsequent call to this API for the same + * memory allocation is flagged with __GFP_ZERO. Otherwise, it is possible that + * __GFP_ZERO is not fully honored by this API. + * + * See krealloc_noprof() for further details. + * + * In any case, the contents of the object pointed to are preserved up to the + * lesser of the new and old sizes. */ static inline __realloc_size(2, 3) void * __must_check krealloc_array_noprof(void *p, size_t new_n, |