The patch titled
Subject: mm: bootmem: drop superfluous range check when freeing pages in bulk
has been removed from the -mm tree. Its filename was
mm-bootmem-drop-superfluous-range-check-when-freeing-pages-in-bulk.patch
This patch was dropped because it is obsolete
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: bootmem: drop superfluous range check when freeing pages in bulk
The area node_bootmem_map represents is aligned to BITS_PER_LONG, and all
bits in any aligned word of that map valid. When the represented area
extends beyond the end of the node, the non-existant pages will be marked
as reserved.
As a result, when freeing a page block, doing an explicit range check for
whether that block is within the node's range is redundant as the bitmap
is consulted anyway to see whether all pages in the block are unreserved.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reported-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/bootmem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/bootmem.c~mm-bootmem-drop-superfluous-range-check-when-freeing-pages-in-bulk mm/bootmem.c
--- a/mm/bootmem.c~mm-bootmem-drop-superfluous-range-check-when-freeing-pages-in-bulk
+++ a/mm/bootmem.c
@@ -197,7 +197,7 @@ static unsigned long __init free_all_boo
idx = start - bdata->node_min_pfn;
vec = ~map[idx / BITS_PER_LONG];
- if (aligned && vec == ~0UL && start + BITS_PER_LONG <= end) {
+ if (aligned && vec == ~0UL) {
int order = ilog2(BITS_PER_LONG);
__free_pages_bootmem(pfn_to_page(start), order);
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
linux-next.patch
memcg-add-mem_cgroup_replace_page_cache-to-fix-lru-issue.patch
memcg-keep-root-group-unchanged-if-creation-fails.patch
mm-page-writebackc-make-determine_dirtyable_memory-static-again.patch
vmscan-promote-shared-file-mapped-pages.patch
vmscan-activate-executable-pages-after-first-usage.patch
mm-do-not-stall-in-synchronous-compaction-for-thp-allocations.patch
mm-do-not-stall-in-synchronous-compaction-for-thp-allocations-v3.patch
vmscan-add-task-name-to-warn_scan_unevictable-messages.patch
mm-page_alloc-generalize-order-handling-in-__free_pages_bootmem.patch
mm-bootmem-try-harder-to-free-pages-in-bulk.patch
memcg-make-mem_cgroup_split_huge_fixup-more-efficient.patch
memcg-fix-pgpgin-pgpgout-documentation.patch
mm-page_cgroup-check-page_cgroup-arrays-in-lookup_page_cgroup-only-when-necessary.patch
page_cgroup-add-helper-function-to-get-swap_cgroup-cleanup.patch
memcg-clean-up-soft_limit_tree-if-allocation-fails.patch
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