From mboxrd@z Thu Jan 1 00:00:00 1970 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 45690CCF9F8 for ; Wed, 5 Nov 2025 03:16:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=khlr+nqfqO8zkgfz4nPt9sJu1gGHQI2iFDjbcvasM4k=; b=OpPn+UlR9nK/dfSBIHlfnWcTLI kLqY7BTHTZGgFrhvj+gU3P3J95cp5pkXYuafyQNEfszvKGVkZQfAsvPN4uwjUwlc/PBXtiGIo1wIn j+bziArEynrbb9KKiehhNz69q+46rfFbB42CDhycG0jswjArwqXDx9UYJ2CUM2uiJ8DjMJIGqLYuE 4c4jNDCqhPmuV8GABblKXKEAIu9xhZrVicI/gXh+iRnONR2VLBEIqInpGSPcwRv/bR1EreWzX09jp 3mV3AX7VbGftdLJ7XK2TfLMSFnSb3fbj4GSgfSnHv6JgCBKbEioJktxLfKwpVRziXyzBkhqeGhq8R 4ikLfWVA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGU0M-0000000CweT-3Gr9; Wed, 05 Nov 2025 03:16:14 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGU0J-0000000Cwe6-1xIS for kexec@lists.infradead.org; Wed, 05 Nov 2025 03:16:13 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1762312570; 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: in-reply-to:in-reply-to:references:references; bh=khlr+nqfqO8zkgfz4nPt9sJu1gGHQI2iFDjbcvasM4k=; b=YDuD4MQMyHyus1o3xNtjMlsGVtzZRH7S044EEyc6i78MKyZfcbAZ8N4qqJBHIWMU+KNGMs dGS/cIsZyBuWtVON+gI25S5SjGps9NfGj034wnbkCwqVZb89QXm3GrE545HEgwn2px8QPp 3HRQamEZGOmtengf4/me8KT3ys+7hok= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-321-pcTzoig4Oy65rcC08Sm5fw-1; Tue, 04 Nov 2025 22:16:06 -0500 X-MC-Unique: pcTzoig4Oy65rcC08Sm5fw-1 X-Mimecast-MFC-AGG-ID: pcTzoig4Oy65rcC08Sm5fw_1762312565 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (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 mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 41CD319560B2; Wed, 5 Nov 2025 03:16:04 +0000 (UTC) Received: from localhost (unknown [10.72.112.190]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B8CB11956056; Wed, 5 Nov 2025 03:16:01 +0000 (UTC) Date: Wed, 5 Nov 2025 11:15:57 +0800 From: Baoquan he To: Sourabh Jain Cc: linux-kernel@vger.kernel.org, Andrew Morton , Jiri Bohac , Shivang Upadhyay , linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org Subject: Re: [PATCH 0/2] Export kdump crashkernel CMA ranges Message-ID: References: <20251103035859.1267318-1-sourabhjain@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251103035859.1267318-1-sourabhjain@linux.ibm.com> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251104_191611_581985_B0B44F4E X-CRM114-Status: GOOD ( 19.46 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On 11/03/25 at 09:28am, Sourabh Jain wrote: > /sys/kernel/kexec_crash_cma_ranges to export all CMA regions reserved > for the crashkernel to user-space. This enables user-space tools > configuring kdump to determine the amount of memory reserved for the > crashkernel. When CMA is used for crashkernel allocation, tools can use > this information to warn users that attempting to capture user pages > while CMA reservation is active may lead to unreliable or incomplete > dump capture. > > While adding documentation for the new sysfs interface, I realized that > there was no ABI document for the existing kexec and kdump sysfs > interfaces, so I added one. > > The first patch adds the ABI documentation for the existing kexec and > kdump sysfs interfaces, and the second patch adds the > /sys/kernel/kexec_crash_cma_ranges sysfs interface along with its > corresponding ABI documentation. > > *Seeking opinions* > There are already four kexec/kdump sysfs entries under /sys/kernel/, > and this patch series adds one more. Should we consider moving them to > a separate directory, such as /sys/kernel/kexec, to avoid polluting > /sys/kernel/? For backward compatibility, we can create symlinks at > the old locations for sometime and remove them in the future. That sounds a good idea, will you do it in v2? Because otherwise the kexec_crash_cma_ranges need be moved too. > > Cc: Andrew Morton > Cc: Baoquan he > Cc: Jiri Bohac > Cc: Shivang Upadhyay > Cc: linuxppc-dev@lists.ozlabs.org > Cc: kexec@lists.infradead.org > > Sourabh Jain (2): > Documentation/ABI: add kexec and kdump sysfs interface > crash: export crashkernel CMA reservation to userspace > > .../ABI/testing/sysfs-kernel-kexec-kdump | 53 +++++++++++++++++++ > kernel/ksysfs.c | 17 ++++++ > 2 files changed, 70 insertions(+) > create mode 100644 Documentation/ABI/testing/sysfs-kernel-kexec-kdump > > -- > 2.51.0 >