From 0cd1a02901858049d14b5b9d4c5c680b012c8cc1 Mon Sep 17 00:00:00 2001 From: Vlastimil Babka Date: Fri, 4 Feb 2022 17:44:40 +0100 Subject: [PATCH] mm/slub: move struct track init out of set_track() set_track() either zeroes out the struct track or fills it, depending on the addr parameter. This is unnecessary as there's only one place that calls it for the initialization - init_tracking(). We can simply do the zeroing there, with a single memset() that covers both TRACK_ALLOC and TRACK_FREE as they are adjacent. Signed-off-by: Vlastimil Babka Reviewed-and-tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Acked-by: David Rientjes --- mm/slub.c | 32 +++++++++++++++----------------- 1 file changed, 15 insertions(+), 17 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 74d92aa..cd4fd01 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -729,34 +729,32 @@ static void set_track(struct kmem_cache *s, void *object, { struct track *p = get_track(s, object, alloc); - if (addr) { #ifdef CONFIG_STACKTRACE - unsigned int nr_entries; + unsigned int nr_entries; - metadata_access_enable(); - nr_entries = stack_trace_save(kasan_reset_tag(p->addrs), - TRACK_ADDRS_COUNT, 3); - metadata_access_disable(); + metadata_access_enable(); + nr_entries = stack_trace_save(kasan_reset_tag(p->addrs), + TRACK_ADDRS_COUNT, 3); + metadata_access_disable(); - if (nr_entries < TRACK_ADDRS_COUNT) - p->addrs[nr_entries] = 0; + if (nr_entries < TRACK_ADDRS_COUNT) + p->addrs[nr_entries] = 0; #endif - p->addr = addr; - p->cpu = smp_processor_id(); - p->pid = current->pid; - p->when = jiffies; - } else { - memset(p, 0, sizeof(struct track)); - } + p->addr = addr; + p->cpu = smp_processor_id(); + p->pid = current->pid; + p->when = jiffies; } static void init_tracking(struct kmem_cache *s, void *object) { + struct track *p; + if (!(s->flags & SLAB_STORE_USER)) return; - set_track(s, object, TRACK_FREE, 0UL); - set_track(s, object, TRACK_ALLOC, 0UL); + p = get_track(s, object, TRACK_ALLOC); + memset(p, 0, 2*sizeof(struct track)); } static void print_track(const char *s, struct track *t, unsigned long pr_time) -- 2.7.4