From: Christoph Lameter Subject: slub page alloc fallback: Enable interrupts for GFP_WAIT. The fallback path needs to enable interrupts like done for the other page allocator calls. This was not necessary with the alternate fast path since we handled irq enable/disable in the slow path. The regular fastpath handles irq enable/disable around calls to the slow path so we need to restore the proper status before calling the page allocator from the slowpath. Signed-off-by: Christoph Lameter --- mm/slub.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) Index: linux-2.6/mm/slub.c =================================================================== --- linux-2.6.orig/mm/slub.c 2008-03-12 23:16:11.000000000 -0700 +++ linux-2.6/mm/slub.c 2008-03-12 23:17:12.000000000 -0700 @@ -1536,9 +1536,15 @@ new_slab: * That is only possible if certain conditions are met that are being * checked when a slab is created. */ - if (!(gfpflags & __GFP_NORETRY) && (s->flags & __PAGE_ALLOC_FALLBACK)) - return kmalloc_large(s->objsize, gfpflags); - + if (!(gfpflags & __GFP_NORETRY) && + (s->flags & __PAGE_ALLOC_FALLBACK)) { + if (gfpflags & __GFP_WAIT) + local_irq_enable(); + object = kmalloc_large(s->objsize, gfpflags); + if (gfpflags & __GFP_WAIT) + local_irq_disable(); + return object; + } return NULL; debug: if (!alloc_debug_processing(s, c->page, object, addr))