linux-kernel - [PATCH 4.19 72/92] drivers/base/memory.c: remove an unnecessary check on NR_MEM

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Message-Id: <20200128135818.638247131@linuxfoundation.org>
Date:   Tue, 28 Jan 2020 15:08:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wei Yang <richard.weiyang@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Seth Jennings <sjenning@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>
Subject: [PATCH 4.19 72/92] drivers/base/memory.c: remove an unnecessary check on NR_MEM_SECTIONS

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

--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -691,7 +691,7 @@ 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;