linux-kernel - [PATCH v9 12/20] powerpc/mm: remove unnecessary test in pgtable_cache

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Message-Id: <48a91a791ec090d1907bef5ea7ec16b406cf1929.1543499864.git.christophe.leroy@c-s.fr>
Date:   Thu, 29 Nov 2018 14:07:09 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v9 12/20] powerpc/mm: remove unnecessary test in
 pgtable_cache_init()

pgtable_cache_add() gracefully handles the case when a cache that
size already exists by returning early with the following test:

	if (PGT_CACHE(shift))
		return; /* Already have a cache of this size */

It is then not needed to test the existence of the cache before.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/mm/init-common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c
index b7ca03643d0b..1e6910eb70ed 100644
--- a/arch/powerpc/mm/init-common.c
+++ b/arch/powerpc/mm/init-common.c
@@ -111,13 +111,13 @@ void pgtable_cache_init(void)
 {
 	pgtable_cache_add(PGD_INDEX_SIZE);
 
-	if (PMD_CACHE_INDEX && !PGT_CACHE(PMD_CACHE_INDEX))
+	if (PMD_CACHE_INDEX)
 		pgtable_cache_add(PMD_CACHE_INDEX);
 	/*
 	 * In all current configs, when the PUD index exists it's the
 	 * same size as either the pgd or pmd index except with THP enabled
 	 * on book3s 64
 	 */
-	if (PUD_CACHE_INDEX && !PGT_CACHE(PUD_CACHE_INDEX))
+	if (PUD_CACHE_INDEX)
 		pgtable_cache_add(PUD_CACHE_INDEX);
 }
-- 
2.13.3