[for,4.19-stable,v2,04/24] drivers/base/memory.c: remove an unnecessary check on NR_MEM_SECTIONS
diff mbox series

Message ID 20200121180150.37454-5-david@redhat.com
State New
Headers show
  • mm/memory_hotplug: backport of pending stable fixes
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Commit Message

David Hildenbrand Jan. 21, 2020, 6:01 p.m. UTC
From: Wei Yang <richard.weiyang@gmail.com>

commit 3b6fd6ffb27c2efa003c6d4d15ca72c054b71d7c upstream.

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;

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@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Seth Jennings <sjenning@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
 drivers/base/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff mbox series

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index ac1574a69610..5fca7225f3fe 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -691,7 +691,7 @@  static int add_memory_block(int base_section_nr)
 	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))