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[195.135.220.15]) by mx.google.com with ESMTPS id n19si2545834ejd.1.2019.03.19.14.11.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Mar 2019 14:11:28 -0700 (PDT) Received-SPF: pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 9655EB606; Tue, 19 Mar 2019 21:11:27 +0000 (UTC) From: Vlastimil Babka To: linux-mm@kvack.org Cc: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Ming Lei , Dave Chinner , Matthew Wilcox , "Darrick J . Wong" , Christoph Hellwig , Michal Hocko , linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, Vlastimil Babka Subject: [RFC 2/2] mm, sl[aou]b: test whether kmalloc() alignment works as expected Date: Tue, 19 Mar 2019 22:11:08 +0100 Message-Id: <20190319211108.15495-3-vbabka@suse.cz> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190319211108.15495-1-vbabka@suse.cz> References: <20190319211108.15495-1-vbabka@suse.cz> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: Quick and dirty init test that kmalloc() alignment works as expected for power-of-two sizes after the previous patch. Signed-off-by: Vlastimil Babka --- mm/slab_common.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/mm/slab_common.c b/mm/slab_common.c index e591d5688558..de10ca9640e0 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -1621,3 +1621,22 @@ int should_failslab(struct kmem_cache *s, gfp_t gfpflags) return 0; } ALLOW_ERROR_INJECTION(should_failslab, ERRNO); + +static int __init slab_kmalloc_test(void) +{ + int i; + + for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) { + unsigned int size = 1 << i; + void * obj = kmalloc(size, GFP_KERNEL); + unsigned long objaddr = (unsigned long) obj; + + printk("Size %u obj %px alignment: %s", size, obj, + (((objaddr & (size - 1)) == 0) ? "OK" : "WRONG")); + kfree(obj); + } + + return 0; +} + +__initcall(slab_kmalloc_test); -- 2.21.0