Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0CD1C433EF for ; Sun, 14 Nov 2021 20:17:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85C0761077 for ; Sun, 14 Nov 2021 20:17:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236343AbhKNUUO (ORCPT ); Sun, 14 Nov 2021 15:20:14 -0500 Received: from out30-130.freemail.mail.aliyun.com ([115.124.30.130]:40492 "EHLO out30-130.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236208AbhKNUTx (ORCPT ); Sun, 14 Nov 2021 15:19:53 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R171e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04407;MF=rongwei.wang@linux.alibaba.com;NM=1;PH=DS;RN=11;SR=0;TI=SMTPD_---0UwUJyNq_1636921010; Received: from localhost.localdomain(mailfrom:rongwei.wang@linux.alibaba.com fp:SMTPD_---0UwUJyNq_1636921010) by smtp.aliyun-inc.com(127.0.0.1); Mon, 15 Nov 2021 04:16:53 +0800 From: Rongwei Wang To: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, james.morse@arm.com, ardb@kernel.org, tabba@google.com, akpm@linux-foundation.org, rppt@kernel.org, anshuman.khandual@arm.com Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] arm64: kexec: reduce calls to page_address() Date: Mon, 15 Nov 2021 04:16:50 +0800 Message-Id: <20211114201650.5542-3-rongwei.wang@linux.alibaba.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211114201650.5542-1-rongwei.wang@linux.alibaba.com> References: <20211030183200.51295-1-rongwei.wang@linux.alibaba.com> <20211114201650.5542-1-rongwei.wang@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In kexec_page_alloc(), page_address() is called twice. This patch add a new variable to help to reduce calls to page_address(). Signed-off-by: Rongwei Wang --- arch/arm64/kernel/machine_kexec.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c index 1038494135c8..7f2530bcd42e 100644 --- a/arch/arm64/kernel/machine_kexec.c +++ b/arch/arm64/kernel/machine_kexec.c @@ -104,13 +104,15 @@ static void *kexec_page_alloc(void *arg) { struct kimage *kimage = (struct kimage *)arg; struct page *page = kimage_alloc_control_pages(kimage, 0); + void *vaddr = NULL; if (!page) return NULL; - memset(page_address(page), 0, PAGE_SIZE); + vaddr = page_address(page); + memset(vaddr, 0, PAGE_SIZE); - return page_address(page); + return vaddr; } int machine_kexec_post_load(struct kimage *kimage) -- 2.27.0