The patch titled
Subject: drivers/base/memory.c: remove an unnecessary check on NR_MEM_SECTIONS
has been added to the -mm tree. Its filename is
drivers-base-memoryc-remove-an-unnecessary-check-on-nr_mem_sections.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/drivers-base-memoryc-remove-an-unnecessary-check-on-nr_mem_sections.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/drivers-base-memoryc-remove-an-unnecessary-check-on-nr_mem_sections.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: drivers/base/memory.c: remove an unnecessary check on NR_MEM_SECTIONS
In cb5e39b8038b ("drivers: base: refactor add_memory_section() to
add_memory_block()"), add_memory_block() is introduced, which is only
invoked in memory_dev_init().
When combining these two loops in memory_dev_init() and
add_memory_block(), they looks like this:
for (i = 0; i < NR_MEM_SECTIONS; i += sections_per_block)
for (j = i;
(j < i + sections_per_block) && j < NR_MEM_SECTIONS;
j++)
Since it is sure the (i < NR_MEM_SECTIONS) and j sits in its own memory
block, the check of (j < NR_MEM_SECTIONS) is not necessary.
This patch just removes this check.
Link: http://lkml.kernel.org/r/20181123222811.18216-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Seth Jennings <sjenning@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/drivers/base/memory.c~drivers-base-memoryc-remove-an-unnecessary-check-on-nr_mem_sections
+++ a/drivers/base/memory.c
@@ -688,7 +688,7 @@ static int add_memory_block(int base_sec
int i, ret, section_count = 0, section_nr;
for (i = base_section_nr;
- (i < base_section_nr + sections_per_block) && i < NR_MEM_SECTIONS;
+ i < base_section_nr + sections_per_block;
i++) {
if (!present_section_nr(i))
continue;
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-page_alloc-fix-calculation-of-pgdat-nr_zones.patch
mm-slub-remove-validation-on-cpu_slab-in-__flush_cpu_slab.patch
mm-slub-page-is-always-non-null-for-node_match.patch
mm-slub-record-final-state-of-slub-action-in-deactivate_slab.patch
mm-slub-improve-performance-by-skipping-checked-node-in-get_any_partial.patch
mm-remove-reset-of-pcp-counter-in-pageset_init.patch
vmscan-return-node_reclaim_noscan-in-node_reclaim-when-config_numa-is-n.patch
drivers-base-memoryc-remove-an-unnecessary-check-on-nr_mem_sections.patch
