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 LhcjOItt 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Mar 12, 2026 at 07:42:25PM +0800, Hao Li wrote: > kmem_cache_refill_sheaf() can fail in two slightly different ways. > During an in-place refill, some objects may already have been added > before the function returns -ENOMEM. On the other hand, if allocation of > a larger replacement sheaf fails, the original sheaf remains unchanged. > > Update the comment to spell out both cases explicitly for clarity. > > Signed-off-by: Hao Li > --- > > mm/slub.c | 21 +++++++++++++++------ > 1 file changed, 15 insertions(+), 6 deletions(-) > > diff --git a/mm/slub.c b/mm/slub.c > index 11a99bd06ac7..8ae248b5b384 100644 > --- a/mm/slub.c > +++ b/mm/slub.c > @@ -5005,14 +5005,23 @@ void kmem_cache_return_sheaf(struct kmem_cache *s, gfp_t gfp, > } > > /* > - * refill a sheaf previously returned by kmem_cache_prefill_sheaf to at least > - * the given size > + * Refill a sheaf previously returned by kmem_cache_prefill_sheaf to at least > + * the given size. > * > - * the sheaf might be replaced by a new one when requesting more than > - * s->sheaf_capacity objects if such replacement is necessary, but the refill > - * fails (returning -ENOMEM), the existing sheaf is left intact > + * On success, the sheaf will contain at least @size objects. > * > - * In practice we always refill to full sheaf's capacity. > + * On failure, there are two cases: > + * > + * 1. If the requested size fits within the current sheaf's capacity, the > + * refill is done in place. In that case, a failed refill may still fill > + * some additional objects into the existing sheaf before returning -ENOMEM. > + * > + * 2. If the requested size exceeds the current sheaf's capacity, a new > + * larger sheaf may be allocated to replace the original one. In that case, > + * if allocation of the replacement sheaf fails, the original sheaf is left > + * unchanged. This is correct, but users of this API probably don't need to know the implementation in detail. I think it's fine to simply say the sheaf may have additional objects even on failure? > + * > + * In practice we usually refill to the sheaf's full capacity. > */ > int kmem_cache_refill_sheaf(struct kmem_cache *s, gfp_t gfp, > struct slab_sheaf **sheafp, unsigned int size) > -- > 2.50.1 > -- Cheers, Harry / Hyeonggon