Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 02/27] Do not sanity check order in the fast path | Date | Mon, 16 Mar 2009 17:53:16 +0000 |
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No user of the allocator API should be passing in an order >= MAX_ORDER but we check for it on each and every allocation. Delete this check and make it a VM_BUG_ON check further down the call path.
Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> --- include/linux/gfp.h | 6 ------ mm/page_alloc.c | 2 ++ 2 files changed, 2 insertions(+), 6 deletions(-)
diff --git a/include/linux/gfp.h b/include/linux/gfp.h index dcf0ab8..8736047 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -181,9 +181,6 @@ __alloc_pages(gfp_t gfp_mask, unsigned int order, static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order) { - if (unlikely(order >= MAX_ORDER)) - return NULL; - /* Unknown node is current node */ if (nid < 0) nid = numa_node_id(); @@ -197,9 +194,6 @@ extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); static inline struct page * alloc_pages(gfp_t gfp_mask, unsigned int order) { - if (unlikely(order >= MAX_ORDER)) - return NULL; - return alloc_pages_current(gfp_mask, order); } extern struct page *alloc_page_vma(gfp_t gfp_mask, diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 0671b3f..dd87dad 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1407,6 +1407,8 @@ get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order, classzone_idx = zone_idx(preferred_zone); + VM_BUG_ON(order >= MAX_ORDER); + zonelist_scan: /* * Scan zonelist, looking for a zone with enough free. -- 1.5.6.5
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