From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f197.google.com (mail-qt0-f197.google.com [209.85.216.197]) by kanga.kvack.org (Postfix) with ESMTP id 8C0C36B0262 for ; Wed, 21 Sep 2016 00:28:57 -0400 (EDT) Received: by mail-qt0-f197.google.com with SMTP id y10so76544983qty.2 for ; Tue, 20 Sep 2016 21:28:57 -0700 (PDT) Received: from sender153-mail.zoho.com (sender153-mail.zoho.com. [74.201.84.153]) by mx.google.com with ESMTPS id t46si26974214qtt.28.2016.09.20.21.28.56 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 20 Sep 2016 21:28:57 -0700 (PDT) From: zijun_hu Subject: [PATCH 3/5] mm/vmalloc.c: correct lazy_max_pages() return value Message-ID: <57E20C49.8010304@zoho.com> Date: Wed, 21 Sep 2016 12:27:53 +0800 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, zijun_hu@htc.com, tj@kernel.org, mingo@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, mgorman@techsingularity.net From: zijun_hu correct lazy_max_pages() return value if the number of online CPUs is power of 2 Signed-off-by: zijun_hu --- mm/vmalloc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index a125ae8..2804224 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -594,7 +594,9 @@ static unsigned long lazy_max_pages(void) { unsigned int log; - log = fls(num_online_cpus()); + log = num_online_cpus(); + if (log > 1) + log = (unsigned int)get_count_order(log); return log * (32UL * 1024 * 1024 / PAGE_SIZE); } -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754053AbcIUE2y (ORCPT ); Wed, 21 Sep 2016 00:28:54 -0400 Received: from sender153-mail.zoho.com ([74.201.84.153]:25443 "EHLO sender153-mail.zoho.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752253AbcIUE2w (ORCPT ); Wed, 21 Sep 2016 00:28:52 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=zapps768; d=zoho.com; h=cc:to:from:subject:message-id:date:user-agent:mime-version:content-type; b=Xi5D6l/yXgCuNW678pIJXMznyPJw455bpyX+N+TON2qDQsOUxFFuQFq8XHRDD85XihggDUxEl9Oe /alRRXeHJMgFFiEktAfejZnwHq7plh+KtBJ+5gT6PCtlfAV4kxTi Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, zijun_hu@htc.com, tj@kernel.org, mingo@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, mgorman@techsingularity.net To: Andrew Morton From: zijun_hu Subject: [PATCH 3/5] mm/vmalloc.c: correct lazy_max_pages() return value Message-ID: <57E20C49.8010304@zoho.com> Date: Wed, 21 Sep 2016 12:27:53 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: zijun_hu correct lazy_max_pages() return value if the number of online CPUs is power of 2 Signed-off-by: zijun_hu --- mm/vmalloc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index a125ae8..2804224 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -594,7 +594,9 @@ static unsigned long lazy_max_pages(void) { unsigned int log; - log = fls(num_online_cpus()); + log = num_online_cpus(); + if (log > 1) + log = (unsigned int)get_count_order(log); return log * (32UL * 1024 * 1024 / PAGE_SIZE); } -- 1.9.1