The patch titled
memory page_alloc revert empty zonelist check
has been removed from the -mm tree. Its filename was
memory-page-alloc-minor-cleanups-fix.patch
This patch was dropped because it was folded into memory-page-alloc-minor-cleanups.patch
------------------------------------------------------
Subject: memory page_alloc revert empty zonelist check
From: Paul Jackson <pj@xxxxxxx>
Backout one item from a previous "memory page_alloc minor cleanups" patch.
Until and unless we are certain that no one can ever pass an empty zonelist
to __alloc_pages(), this check for an empty zonelist (or some BUG
equivalent) is essential. The code in get_page_from_freelist() blow ups if
passed an empty zonelist.
Signed-off-by: Paul Jackson <pj@xxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/page_alloc.c | 7 +++++++
1 files changed, 7 insertions(+)
diff -puN mm/page_alloc.c~memory-page-alloc-minor-cleanups-fix mm/page_alloc.c
--- a/mm/page_alloc.c~memory-page-alloc-minor-cleanups-fix
+++ a/mm/page_alloc.c
@@ -994,6 +994,13 @@ __alloc_pages(gfp_t gfp_mask, unsigned i
might_sleep_if(wait);
restart:
+ z = zonelist->zones; /* the list of zones suitable for gfp_mask */
+
+ if (unlikely(*z == NULL)) {
+ /* Should this ever happen?? */
+ return NULL;
+ }
+
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order,
zonelist, ALLOC_WMARK_LOW|ALLOC_CPUSET);
if (page)
_
Patches currently in -mm which might be from pj@xxxxxxx are
memory-page-alloc-minor-cleanups.patch
memory-page-alloc-minor-cleanups-fix.patch
memory-page_alloc-zonelist-caching-speedup.patch
memory-page_alloc-zonelist-caching-reorder-structure.patch
cpuset-minor-code-refinements.patch
cpuset-remove-sched-domain-hooks-from-cpusets.patch
cpuset-allow-a-larger-buffer-for-writes-to-cpuset-files.patch
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