The patch titled Subject: mm: bootmem: drop superfluous range check when freeing pages in bulk has been added to the -mm tree. Its filename is mm-bootmem-drop-superfluous-range-check-when-freeing-pages-in-bulk.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this 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); _ Subject: Subject: mm: bootmem: drop superfluous range check when freeing pages in bulk 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 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-remove-order-assumption-from-__free_pages_bootmem.patch mm-page_alloc-generalize-order-handling-in-__free_pages_bootmem.patch mm-bootmem-drop-superfluous-range-check-when-freeing-pages-in-bulk.patch mm-bootmem-try-harder-to-free-pages-in-bulk.patch cgroups-add-res_counter_write_u64-api.patch cgroups-new-resource-counter-inheritance-api.patch cgroups-add-previous-cgroup-in-can_attach_task-attach_task-callbacks.patch cgroups-new-cancel_attach_task-subsystem-callback.patch cgroups-ability-to-stop-res-charge-propagation-on-bounded-ancestor.patch cgroups-add-res-counter-common-ancestor-searching.patch res_counter-allow-charge-failure-pointer-to-be-null.patch cgroups-pull-up-res-counter-charge-failure-interpretation-to-caller.patch cgroups-allow-subsystems-to-cancel-a-fork.patch cgroups-add-a-task-counter-subsystem.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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html