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authorroot <root@programming.kicks-ass.net>2008-01-07 23:20:28 -0800
committerChristoph Lameter <clameter@sgi.com>2008-02-04 10:56:02 -0800
commitba84c73c7ae21fc891a3c2576fa3be42752fce53 (patch)
treed6e569ad26cf604fc16617388dd314e4b5e47fcb
parent064287807c9dd64688084d34c6748a326b5f3ec8 (diff)
SLUB: Do not upset lockdep
inconsistent {softirq-on-W} -> {in-softirq-W} usage. swapper/0 [HC0[0]:SC1[1]:HE0:SE0] takes: (&n->list_lock){-+..}, at: [<ffffffff802935c1>] add_partial+0x31/0xa0 {softirq-on-W} state was registered at: [<ffffffff80259fb8>] __lock_acquire+0x3e8/0x1140 [<ffffffff80259838>] debug_check_no_locks_freed+0x188/0x1a0 [<ffffffff8025ad65>] lock_acquire+0x55/0x70 [<ffffffff802935c1>] add_partial+0x31/0xa0 [<ffffffff805c76de>] _spin_lock+0x1e/0x30 [<ffffffff802935c1>] add_partial+0x31/0xa0 [<ffffffff80296f9c>] kmem_cache_open+0x1cc/0x330 [<ffffffff805c7984>] _spin_unlock_irq+0x24/0x30 [<ffffffff802974f4>] create_kmalloc_cache+0x64/0xf0 [<ffffffff80295640>] init_alloc_cpu_cpu+0x70/0x90 [<ffffffff8080ada5>] kmem_cache_init+0x65/0x1d0 [<ffffffff807f1b4e>] start_kernel+0x23e/0x350 [<ffffffff807f112d>] _sinittext+0x12d/0x140 [<ffffffffffffffff>] 0xffffffffffffffff This change isn't really necessary for correctness, but it prevents lockdep from getting upset and then disabling itself. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Christoph Lameter <clameter@sgi.com> Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Christoph Lameter <clameter@sgi.com>
-rw-r--r--mm/slub.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/slub.c b/mm/slub.c
index a660834416a..3f056677fa8 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1999,6 +1999,7 @@ static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags,
{
struct page *page;
struct kmem_cache_node *n;
+ unsigned long flags;
BUG_ON(kmalloc_caches->size < sizeof(struct kmem_cache_node));
@@ -2023,7 +2024,14 @@ static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags,
#endif
init_kmem_cache_node(n);
atomic_long_inc(&n->nr_slabs);
+ /*
+ * lockdep requires consistent irq usage for each lock
+ * so even though there cannot be a race this early in
+ * the boot sequence, we still disable irqs.
+ */
+ local_irq_save(flags);
add_partial(n, page, 0);
+ local_irq_restore(flags);
return n;
}