linux-kernel - [RESEND PATCH] x86: remove redundant check for kmem_cache

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Message-Id: <1528798609-111951-1-git-send-email-cgxu519@gmx.com>
Date:   Tue, 12 Jun 2018 18:16:49 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Chengguang Xu <cgxu519@....com>
Subject: [RESEND PATCH] x86: remove redundant check for kmem_cache_create()

The flag 'SLAB_PANIC' implies panic when encouter failure,
so there is no need to check NULL pointer and return error
code.

Signed-off-by: Chengguang Xu <cgxu519@....com>
---
 arch/x86/mm/pgtable.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 47b5951..4392414 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -312,14 +312,14 @@ static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmds[])
 
 static struct kmem_cache *pgd_cache;
 
-static int __init pgd_cache_init(void)
+static void __init pgd_cache_init(void)
 {
 	/*
 	 * When PAE kernel is running as a Xen domain, it does not use
 	 * shared kernel pmd. And this requires a whole page for pgd.
 	 */
 	if (!SHARED_KERNEL_PMD)
-		return 0;
+		return;
 
 	/*
 	 * when PAE kernel is not running as a Xen domain, it uses
@@ -329,10 +329,6 @@ static int __init pgd_cache_init(void)
 	 */
 	pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_ALIGN,
 				      SLAB_PANIC, NULL);
-	if (!pgd_cache)
-		return -ENOMEM;
-
-	return 0;
 }
 core_initcall(pgd_cache_init);
 
-- 
1.8.3.1