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Subject[PATCH 3.16.y-ckt 024/126] Revert "mm: Check if section present during memory block (un)registering"
Date
3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 8346aa765e14348b7b436825b3c4740895a2fe1a upstream.

This reverts commit 7568fb63f57ac8672f8bf2018171255441238882 as it's
already in Linus's tree through a different patch.

Reported-by: Tony Luck <tony.luck@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
drivers/base/node.c | 31 ++++---------------------------
1 file changed, 4 insertions(+), 27 deletions(-)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 7334e47996bc..5777d10d1e25 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -397,18 +397,7 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
sect_end_pfn += PAGES_PER_SECTION - 1;
for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
- int page_nid, scn_nr;
-
- /*
- * memory block could have several absent sections from start.
- * skip pfn range from absent section
- */
- scn_nr = pfn_to_section_nr(pfn);
- if (!present_section_nr(scn_nr)) {
- pfn = round_down(pfn + PAGES_PER_SECTION,
- PAGES_PER_SECTION) - 1;
- continue;
- }
+ int page_nid;

/*
* memory block could have several absent sections from start.
@@ -454,22 +443,10 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
return -ENOMEM;
nodes_clear(*unlinked_nodes);

- sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
- sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
- sect_end_pfn += PAGES_PER_SECTION - 1;
+ sect_start_pfn = section_nr_to_pfn(phys_index);
+ sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
- int nid, scn_nr;
-
- /*
- * memory block could have several absent sections from start.
- * skip pfn range from absent section
- */
- scn_nr = pfn_to_section_nr(pfn);
- if (!present_section_nr(scn_nr)) {
- pfn = round_down(pfn + PAGES_PER_SECTION,
- PAGES_PER_SECTION) - 1;
- continue;
- }
+ int nid;

nid = get_nid_for_pfn(pfn);
if (nid < 0)

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