SLUB: simplify IRQ off handling

Move irq handling out of new slab into __slab_alloc.  That is useful for
Mathieu's cmpxchg_local patchset and also allows us to remove the crude
local_irq_off in early_kmem_cache_alloc().

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 11 deletions

diff --git a/mm/slub.c b/mm/slub.c
index f426f9bc644..0f862fbd344 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1085,9 +1085,6 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
 
         BUG_ON(flags & GFP_SLAB_BUG_MASK);
 
-        if (flags & __GFP_WAIT)
-                local_irq_enable();
-
         page = allocate_slab(s,
                 flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);
         if (!page)
@@ -1120,8 +1117,6 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
         page->freelist = start;
         page->inuse = 0;
 out:
-        if (flags & __GFP_WAIT)
-                local_irq_disable();
         return page;
 }
 
@@ -1505,7 +1500,14 @@ new_slab:
                 goto load_freelist;
         }
 
+        if (gfpflags & __GFP_WAIT)
+                local_irq_enable();
+
         new = new_slab(s, gfpflags, node);
+
+        if (gfpflags & __GFP_WAIT)
+                local_irq_disable();
+
         if (new) {
                 c = get_cpu_slab(s, smp_processor_id());
                 if (c->page) {
@@ -2039,12 +2041,6 @@ static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags,
         init_kmem_cache_node(n);
         atomic_long_inc(&n->nr_slabs);
         add_partial(n, page);
-
-        /*
-         * new_slab() disables interupts. If we do not reenable interrupts here
-         * then bootup would continue with interrupts disabled.
-         */
-        local_irq_enable();
         return n;
 }