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| author | Andrey Konovalov <andreyknvl@google.com> | 2022-04-28 17:59:40 +0200 |
|---|---|---|
| committer | Vlastimil Babka <vbabka@suse.cz> | 2022-05-02 10:47:25 +0200 |
| commit | 154036a3b3f39cb17fc65511011f4c4024846e91 (patch) | |
| tree | 4148b1e6cef16ab9522b01cfa26505c37c177587 /include/linux/slab.h | |
| parent | 8cf9e1210adf49cd83d11e2b1984540cf0e0be71 (diff) | |
| download | linux-154036a3b3f39cb17fc65511011f4c4024846e91.tar.bz2 | |
mm: slab: fix comment for __assume_kmalloc_alignment
The comment next to the __assume_kmalloc_alignment definition is not
precise: kmalloc relies on kmem_cache_alloc, so kmalloc technically returns
pointers aligned to both ARCH_KMALLOC_MINALIGN and ARCH_SLAB_MINALIGN,
not only to ARCH_KMALLOC_MINALIGN.
(See create_kmalloc_cache()->create_boot_cache()->calculate_alignment()
for SLAB and SLUB and __do_kmalloc_node() for SLOB.)
Clarify the comment.
The assumption specified by __assume_kmalloc_alignment is still correct,
although it can be made stronger. I'll leave this to a separate patch.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Link: https://lore.kernel.org/r/84d8142747230f2015eaf9705ee7c2e1a9f56596.1651161548.git.andreyknvl@google.com
Diffstat (limited to 'include/linux/slab.h')
| -rw-r--r-- | include/linux/slab.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h index 8c090599fc21..58bb9392775d 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -217,9 +217,9 @@ void kmem_dump_obj(void *object); #endif /* - * kmalloc and friends return ARCH_KMALLOC_MINALIGN aligned - * pointers. kmem_cache_alloc and friends return ARCH_SLAB_MINALIGN - * aligned pointers. + * kmem_cache_alloc and friends return pointers aligned to ARCH_SLAB_MINALIGN. + * kmalloc and friends return pointers aligned to both ARCH_KMALLOC_MINALIGN + * and ARCH_SLAB_MINALIGN, but here we only assume the former alignment. */ #define __assume_kmalloc_alignment __assume_aligned(ARCH_KMALLOC_MINALIGN) #define __assume_slab_alignment __assume_aligned(ARCH_SLAB_MINALIGN) |