linux-kernel - [PATCH v2] x86/mm: Remove the redundant conditional check

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Message-Id: <20200311011823.27740-1-bhe@redhat.com>
Date:   Wed, 11 Mar 2020 09:18:23 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, x86@...nel.org, mhocko@...e.com,
        akpm@...ux-foundation.org, bhe@...hat.com
Subject: [PATCH v2] x86/mm: Remove the redundant conditional check

In commit f70029bbaacb ("mm, memory_hotplug: drop CONFIG_MOVABLE_NODE"),
the dependency on CONFIG_MOVABLE_NODE was removed for N_MEMORY. Before
commit f70029bbaacb, CONFIG_HIGHMEM && !CONFIG_MOVABLE_NODE could make
(N_MEMORY == N_NORMAL_MEMORY) be true. After commit f70029bbaacb, N_MEMORY
doesn't have any chance to be equal to N_NORMAL_MEMORY. So the conditional
check in paging_init() doesn't make sense any more. Let's remove it.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
v1->v2:
  Update patch log to make the description clearer per Michal's
  suggestion.

 arch/x86/mm/init_64.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index abbdecb75fad..0a14711d3a93 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -818,8 +818,7 @@ void __init paging_init(void)
 	 *	 will not set it back.
 	 */
 	node_clear_state(0, N_MEMORY);
-	if (N_MEMORY != N_NORMAL_MEMORY)
-		node_clear_state(0, N_NORMAL_MEMORY);
+	node_clear_state(0, N_NORMAL_MEMORY);

 	zone_sizes_init();
 }
-- 
2.17.2