From patchwork Mon Jun 13 08:09:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Leizhen (ThunderTown)" X-Patchwork-Id: 12879153 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EF13AC433EF for ; Mon, 13 Jun 2022 08:12:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=DUY7a976E2B2hQ8H4ZNE5uODTxuGNZ0Nerv+qLKUGiM=; b=WWDopkeSCubzLX dbe+SudOqp8fjHCUvHPgI7IgXB9cW7+bERUbguKe0yG+gYCKUIqv36eNXIhk3S+v1qTJbMJRTHvgP YAik6ycEm9elnZ+GGKxwF6Q+YP7Bir4sntJCTkjGtZgRa4dUdUwfY8FNExn0HX9DS0j/XU69p545B iZVxfwS8WbYnKw2jvpsv5Q79TknYUm+od/gH4BpAsyFfGgGdZicWofoPo6hIiOx0bShvahehA862y y0pASAIqiLb5vfiZ2prqhifk1s49gvpE4kTTXbWSSP0+1VOoX1DS/8FjsoeBoDzEE7yS15fkCTfeY iosopUcSk8n5+9bqYBHQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o0fAY-002Azd-QV; Mon, 13 Jun 2022 08:11:30 +0000 Received: from szxga08-in.huawei.com ([45.249.212.255]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o0fAE-002Aqa-W4; Mon, 13 Jun 2022 08:11:13 +0000 Received: from dggpemm500022.china.huawei.com (unknown [172.30.72.57]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4LM4395M1Nz1K9Q9; Mon, 13 Jun 2022 16:09:09 +0800 (CST) Received: from dggpemm500006.china.huawei.com (7.185.36.236) by dggpemm500022.china.huawei.com (7.185.36.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 13 Jun 2022 16:11:04 +0800 Received: from thunder-town.china.huawei.com (10.174.178.55) by dggpemm500006.china.huawei.com (7.185.36.236) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 13 Jun 2022 16:11:03 +0800 From: Zhen Lei To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , , "H . Peter Anvin" , Eric Biederman , Rob Herring , Frank Rowand , , Dave Young , Baoquan He , Vivek Goyal , , , Catalin Marinas , Will Deacon , , Jonathan Corbet , CC: Zhen Lei , Randy Dunlap , Feng Zhou , Kefeng Wang , Chen Zhou , "John Donnelly" , Dave Kleikamp Subject: [PATCH 3/5] arm64: kdump: Remove some redundant checks in map_mem() Date: Mon, 13 Jun 2022 16:09:30 +0800 Message-ID: <20220613080932.663-4-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.26.0.windows.1 In-Reply-To: <20220613080932.663-1-thunder.leizhen@huawei.com> References: <20220613080932.663-1-thunder.leizhen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.178.55] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggpemm500006.china.huawei.com (7.185.36.236) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220613_011111_400424_5EA22274 X-CRM114-Status: GOOD ( 11.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org arm64_memblock_init() if (!IS_ENABLED(CONFIG_ZONE_DMA/DMA32)) reserve_crashkernel() //initialize crashk_res when //"crashkernel=" is correctly specified paging_init() map_mem() As shown in the above pseudo code, the crashk_res.end can only be initialized to non-zero when both "!IS_ENABLED(CONFIG_ZONE_DMA/DMA32)" and crash_mem_map are true. So some checks in map_mem() can be adjusted or optimized. Signed-off-by: Zhen Lei Acked-by: Baoquan He --- arch/arm64/mm/mmu.c | 25 +++++++++++-------------- 1 file changed, 11 insertions(+), 14 deletions(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 626ec32873c6c36..6028a5757e4eae2 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -529,12 +529,12 @@ static void __init map_mem(pgd_t *pgdp) #ifdef CONFIG_KEXEC_CORE if (crash_mem_map) { - if (IS_ENABLED(CONFIG_ZONE_DMA) || - IS_ENABLED(CONFIG_ZONE_DMA32)) - flags |= NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS; - else if (crashk_res.end) + if (crashk_res.end) memblock_mark_nomap(crashk_res.start, resource_size(&crashk_res)); + else if (IS_ENABLED(CONFIG_ZONE_DMA) || + IS_ENABLED(CONFIG_ZONE_DMA32)) + flags |= NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS; } #endif @@ -571,16 +571,13 @@ static void __init map_mem(pgd_t *pgdp) * through /sys/kernel/kexec_crash_size interface. */ #ifdef CONFIG_KEXEC_CORE - if (crash_mem_map && - !IS_ENABLED(CONFIG_ZONE_DMA) && !IS_ENABLED(CONFIG_ZONE_DMA32)) { - if (crashk_res.end) { - __map_memblock(pgdp, crashk_res.start, - crashk_res.end + 1, - PAGE_KERNEL, - NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS); - memblock_clear_nomap(crashk_res.start, - resource_size(&crashk_res)); - } + if (crashk_res.end) { + __map_memblock(pgdp, crashk_res.start, + crashk_res.end + 1, + PAGE_KERNEL, + NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS); + memblock_clear_nomap(crashk_res.start, + resource_size(&crashk_res)); } #endif }