From patchwork Fri Jan 19 14:52:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoquan He X-Patchwork-Id: 13523930 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 99C04C47DD7 for ; Fri, 19 Jan 2024 14:53:39 +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=nRRQ+gTuUjom5dZdnwsYNoSLLYmtHnF62GplgyO4yK4=; b=MHqWGSWcPuQccz TUHpxghVHXmyaw2FUCoT7gppFsIkTNMfMc7ZYPIKpr/xhXqVO4sXH1SrIus3U8ZVpHHaZde/kBNmG FyLYKg1TpZN2ajnpv9HYPAwr+EN5fGBTt/kt/3r60S+3GhqFTw5PL/BCS55CsqHynLrvqHqPy+Y/p bCk1Rx+wcjJamHd7xyWwdZ8/beZKO6fGW6uo287os+rf84T2CBOjdx6Ak8eYbZAp0vz4I9FCVADyY A65iHWBW70PTz1GJy++DY5gGS4NlX1CEkQbZth+DNYvZKbztWOz8qlaR5YeTUjfIa4iAFUeiF5S/c QjS6coJne2oADBkOkAJw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rQqFO-005tUh-1r; Fri, 19 Jan 2024 14:53:30 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rQqFJ-005tPh-2Z for linux-riscv@lists.infradead.org; Fri, 19 Jan 2024 14:53:28 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1705676004; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7S3FI85k6ctO+BbrXXBIV/RwVoqMqQpFkEo8oxKhpCE=; b=JAY2/lmGbXteVpg24ONlIrEEEyqO4rckGA0Vl7TAzlRzGPm4A/oZ6lAyBNG9XIrvxRee82 BBKkActo4bE8EfHzKiGn0jS/NYl6suAI3CTEZ9+wCtxROismkFHI9tJla9jsZdYU4zpXmo XK88Bh2/Jz2yCRQPspFYe99ev9rQNac= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-593-bX-7zOb-MIWHGXFxchsW9g-1; Fri, 19 Jan 2024 09:53:19 -0500 X-MC-Unique: bX-7zOb-MIWHGXFxchsW9g-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id DB4FB3C11CC4; Fri, 19 Jan 2024 14:53:18 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.116.4]) by smtp.corp.redhat.com (Postfix) with ESMTP id 992D351D5; Fri, 19 Jan 2024 14:53:09 +0000 (UTC) From: Baoquan He To: linux-kernel@vger.kernel.org Cc: kexec@lists.infradead.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, akpm@linux-foundation.org, ebiederm@xmission.com, hbathini@linux.ibm.com, piliu@redhat.com, viro@zeniv.linux.org.uk, Baoquan He Subject: [PATCH v2 03/14] crash: remove dependency of FA_DUMP on CRASH_DUMP Date: Fri, 19 Jan 2024 22:52:30 +0800 Message-ID: <20240119145241.769622-4-bhe@redhat.com> In-Reply-To: <20240119145241.769622-1-bhe@redhat.com> References: <20240119145241.769622-1-bhe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240119_065325_903401_47E45788 X-CRM114-Status: GOOD ( 12.71 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org In kdump kernel, /proc/vmcore is an elf file mapping the crashed kernel's old memory content. Its elf header is constructed in 1st kernel and passed to kdump kernel via elfcorehdr_addr. Config CRASH_DUMP enables the code of 1st kernel's old memory accessing in different architectures. Currently, config FA_DUMP has dependency on CRASH_DUMP because fadump needs access global variable 'elfcorehdr_addr' to judge if it's in kdump kernel within function is_kdump_kernel(). In the current kernel/crash_dump.c, variable 'elfcorehdr_addr' is defined, and function setup_elfcorehdr() used to parse kernel parameter to fetch the passed value of elfcorehdr_addr. Only for accessing elfcorehdr_addr, FA_DUMP really doesn't have to depends on CRASH_DUMP. To remove the dependency of FA_DUMP on CRASH_DUMP to avoid confusion, rename kernel/crash_dump.c to kernel/elfcorehdr.c, and build it when CONFIG_VMCORE_INFO is ebabled. With this, FA_DUMP doesn't need to depend on CRASH_DUMP. Signed-off-by: Baoquan He --- arch/powerpc/Kconfig | 1 - kernel/Makefile | 3 +-- kernel/{crash_dump.c => elfcorehdr.c} | 0 kernel/kexec_internal.h | 2 ++ 4 files changed, 3 insertions(+), 3 deletions(-) rename kernel/{crash_dump.c => elfcorehdr.c} (100%) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 1520146d7c2c..1cdb8fdd3735 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -692,7 +692,6 @@ config FA_DUMP depends on PPC64 && (PPC_RTAS || PPC_POWERNV) select VMCORE_INFO select CRASH_RESERVE - select CRASH_DUMP help A robust mechanism to get reliable kernel crash dump with assistance from firmware. This approach does not use kexec, diff --git a/kernel/Makefile b/kernel/Makefile index 649272a1d6b9..35abc65e1f1a 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -68,7 +68,7 @@ obj-$(CONFIG_MODULE_SIG_FORMAT) += module_signature.o obj-$(CONFIG_KALLSYMS) += kallsyms.o obj-$(CONFIG_KALLSYMS_SELFTEST) += kallsyms_selftest.o obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o -obj-$(CONFIG_VMCORE_INFO) += vmcore_info.o +obj-$(CONFIG_VMCORE_INFO) += vmcore_info.o elfcorehdr.o obj-$(CONFIG_CRASH_RESERVE) += crash_reserve.o obj-$(CONFIG_KEXEC_CORE) += kexec_core.o crash_core.o obj-$(CONFIG_KEXEC) += kexec.o @@ -121,7 +121,6 @@ obj-$(CONFIG_PERF_EVENTS) += events/ obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o obj-$(CONFIG_PADATA) += padata.o -obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_JUMP_LABEL) += jump_label.o obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o obj-$(CONFIG_TORTURE_TEST) += torture.o diff --git a/kernel/crash_dump.c b/kernel/elfcorehdr.c similarity index 100% rename from kernel/crash_dump.c rename to kernel/elfcorehdr.c diff --git a/kernel/kexec_internal.h b/kernel/kexec_internal.h index 74da1409cd14..2595defe8c0d 100644 --- a/kernel/kexec_internal.h +++ b/kernel/kexec_internal.h @@ -4,6 +4,8 @@ #include +struct kexec_segment; + struct kimage *do_kimage_alloc_init(void); int sanity_check_segment_list(struct kimage *image); void kimage_free_page_list(struct list_head *list);