From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 5 Aug 2026 07:52:36 -0700 Subject: workqueue: skip the node_nr_active update for non-unbound workqueues apply_wqattrs_commit() updates node_nr_active->max unconditionally. wq->node_nr_active[] is only allocated for unbound workqueues, so guard the call before per-cpu workqueues start using this path. No functional change: only unbound workqueues reach apply_wqattrs_*() today. Signed-off-by: Breno Leitao Signed-off-by: Tejun Heo --- io_uring/alloc_cache.h | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 io_uring/alloc_cache.h (limited to 'io_uring/alloc_cache.h') diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h new file mode 100644 index 000000000..962b6e2d0 --- /dev/null +++ b/io_uring/alloc_cache.h @@ -0,0 +1,70 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef IOU_ALLOC_CACHE_H +#define IOU_ALLOC_CACHE_H + +#include +#include + +/* + * Don't allow the cache to grow beyond this size. + */ +#define IO_ALLOC_CACHE_MAX 128 + +void io_alloc_cache_free(struct io_alloc_cache *cache, + void (*free)(const void *)); +bool io_alloc_cache_init(struct io_alloc_cache *cache, + unsigned max_nr, unsigned int size, + unsigned int init_bytes); + +void *io_cache_alloc_new(struct io_alloc_cache *cache, gfp_t gfp); + +static inline bool io_alloc_cache_put(struct io_alloc_cache *cache, + void *entry) +{ + if (cache->nr_cached < cache->max_cached) { + if (!kasan_mempool_poison_object(entry)) + return false; + cache->entries[cache->nr_cached++] = entry; + return true; + } + return false; +} + +static inline void *io_alloc_cache_get(struct io_alloc_cache *cache) +{ + if (cache->nr_cached) { + void *entry = cache->entries[--cache->nr_cached]; + + /* + * If KASAN is enabled, always clear the initial bytes that + * must be zeroed post alloc, in case any of them overlap + * with KASAN storage. + */ +#if defined(CONFIG_KASAN) + kasan_mempool_unpoison_object(entry, cache->elem_size); + if (cache->init_clear) + memset(entry, 0, cache->init_clear); +#endif + return entry; + } + + return NULL; +} + +static inline void *io_cache_alloc(struct io_alloc_cache *cache, gfp_t gfp) +{ + void *obj; + + obj = io_alloc_cache_get(cache); + if (obj) + return obj; + return io_cache_alloc_new(cache, gfp); +} + +static inline void io_cache_free(struct io_alloc_cache *cache, void *obj) +{ + if (!io_alloc_cache_put(cache, obj)) + kvfree(obj); +} + +#endif -- cgit v1.3.1