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Mon, 09 Sep 2019 18:27:44 -0700 (PDT) Received: from localhost.localdomain.localdomain ([2408:823c:c11:160:b8c3:8577:bf2f:3]) by smtp.gmail.com with ESMTPSA id b20sm19558629pff.158.2019.09.09.18.27.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Sep 2019 18:27:44 -0700 (PDT) From: Pengfei Li To: akpm@linux-foundation.org Cc: vbabka@suse.cz, cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, guro@fb.com, Pengfei Li Subject: [PATCH v3 4/4] mm, slab_common: Make the loop for initializing KMALLOC_DMA start from 1 Date: Tue, 10 Sep 2019 09:26:52 +0800 Message-Id: <20190910012652.3723-5-lpf.vector@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190910012652.3723-1-lpf.vector@gmail.com> References: <20190910012652.3723-1-lpf.vector@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: KMALLOC_DMA will be initialized only if KMALLOC_NORMAL with the same index exists. And kmalloc_caches[KMALLOC_NORMAL][0] is always NULL. Therefore, the loop that initializes KMALLOC_DMA should start at 1 instead of 0, which will reduce 1 meaningless attempt. Signed-off-by: Pengfei Li --- mm/slab_common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index af45b5278fdc..c81fc7dc2946 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -1236,7 +1236,7 @@ void __init create_kmalloc_caches(slab_flags_t flag= s) slab_state =3D UP; =20 #ifdef CONFIG_ZONE_DMA - for (i =3D 0; i <=3D KMALLOC_SHIFT_HIGH; i++) { + for (i =3D 1; i <=3D KMALLOC_SHIFT_HIGH; i++) { struct kmem_cache *s =3D kmalloc_caches[KMALLOC_NORMAL][i]; =20 if (s) { --=20 2.21.0