+ mm-sparse-fix-typo-in-online_mem_sections.patch added to -mm tree

+ mm-sparse-fix-typo-in-online_mem_sections.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/sparse.c: fix typo in online_mem_sections
has been added to the -mm tree.  Its filename is
     mm-sparse-fix-typo-in-online_mem_sections.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-sparse-fix-typo-in-online_mem_sections.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-sparse-fix-typo-in-online_mem_sections.patch

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------------------------------------------------------
From: Michal Hocko <mhocko@suse.com>
Subject: mm/sparse.c: fix typo in online_mem_sections

online_mem_sections() accidentally marks online only the first section in
the given range.  This is a typo which hasn't been noticed because I
haven't tested large 2GB blocks previously.  All users of
pfn_to_online_page would get confused on the the rest of the pfn range in
the block.

All we need to fix this is to use iterator (pfn) rather than start_pfn.

Link: http://lkml.kernel.org/r/20170904112210.3401-1-mhocko@kernel.org
Fixes: 2d070eab2e82 ("mm: consider zone which is not fully populated to have holes")
Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/sparse.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/sparse.c~mm-sparse-fix-typo-in-online_mem_sections mm/sparse.c
--- a/mm/sparse.c~mm-sparse-fix-typo-in-online_mem_sections
+++ a/mm/sparse.c
@@ -626,7 +626,7 @@ void online_mem_sections(unsigned long s
 	unsigned long pfn;
 
 	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
-		unsigned long section_nr = pfn_to_section_nr(start_pfn);
+		unsigned long section_nr = pfn_to_section_nr(pfn);
 		struct mem_section *ms;
 
 		/* onlining code should never touch invalid ranges */
_

Patches currently in -mm which might be from mhocko@suse.com are

mm-memory_hotplug-do-not-back-off-draining-pcp-free-pages-from-kworker-context.patch
mm-memory_hotplug-display-allowed-zones-in-the-preferred-ordering.patch
mm-memory_hotplug-remove-zone-restrictions.patch
mm-page_alloc-rip-out-zonelist_order_zone.patch
mm-page_alloc-rip-out-zonelist_order_zone-fix.patch
mm-page_alloc-remove-boot-pageset-initialization-from-memory-hotplug.patch
mm-page_alloc-do-not-set_cpu_numa_mem-on-empty-nodes-initialization.patch
mm-memory_hotplug-drop-zone-from-build_all_zonelists.patch
mm-memory_hotplug-remove-explicit-build_all_zonelists-from-try_online_node.patch
mm-page_alloc-simplify-zonelist-initialization.patch
mm-page_alloc-remove-stop_machine-from-build_all_zonelists.patch
mm-memory_hotplug-get-rid-of-zonelists_mutex.patch
mm-sparse-page_ext-drop-ugly-n_high_memory-branches-for-allocations.patch
mm-vmscan-do-not-loop-on-too_many_isolated-for-ever.patch
mm-vmscan-do-not-loop-on-too_many_isolated-for-ever-fix.patch
mm-rename-global_page_state-to-global_zone_page_state.patch
mm-hugetlb-do-not-allocate-non-migrateable-gigantic-pages-from-movable-zones.patch
mm-oom-do-not-rely-on-tif_memdie-for-memory-reserves-access.patch
mm-replace-tif_memdie-checks-by-tsk_is_oom_victim.patch
mm-memory_hotplug-introduce-add_pages.patch
mm-sparse-fix-typo-in-online_mem_sections.patch
fs-proc-remove-priv-argument-from-is_stack.patch
treewide-remove-gfp_temporary-allocation-flag.patch