From 27390bc335ff86d92c3819cc28035fde23d1a9c2 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Fri, 1 Jun 2007 00:47:09 -0700 Subject: [PATCH] SLUB: fix locking for hotplug callbacks Hotplug callbacks are performed with interrupts enabled. Slub requires interrupts to be disabled for flushing caches. Signed-off-by: Christoph Lameter Cc: Michal Piotrowski Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/slub.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/mm/slub.c b/mm/slub.c index 238c5a6ee896..51663a3c3c24 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2607,6 +2607,19 @@ static void for_all_slabs(void (*func)(struct kmem_cache *, int), int cpu) up_read(&slub_lock); } +/* + * Version of __flush_cpu_slab for the case that interrupts + * are enabled. + */ +static void cpu_slab_flush(struct kmem_cache *s, int cpu) +{ + unsigned long flags; + + local_irq_save(flags); + __flush_cpu_slab(s, cpu); + local_irq_restore(flags); +} + /* * Use the cpu notifier to insure that the cpu slabs are flushed when * necessary. @@ -2621,7 +2634,7 @@ static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb, case CPU_UP_CANCELED_FROZEN: case CPU_DEAD: case CPU_DEAD_FROZEN: - for_all_slabs(__flush_cpu_slab, cpu); + for_all_slabs(cpu_slab_flush, cpu); break; default: break; -- GitLab