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Thu, 12 Sep 2024 04:35:21 -0400 X-MC-Unique: 2BlVXIOmMKqAuDa4ttDdxw-1 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 78FAF1955D47; Thu, 12 Sep 2024 08:35:19 +0000 (UTC) Received: from localhost (unknown [10.72.112.58]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 95D0119560A3; Thu, 12 Sep 2024 08:35:17 +0000 (UTC) Date: Thu, 12 Sep 2024 16:35:13 +0800 From: Baoquan He To: Sourabh Jain , akpm@linux-foundation.org Cc: Hari Bathini , Michael Ellerman , kexec@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, x86@kernel.org, Sachin P Bappalige Subject: Re: [PATCH RESEND v2] kexec/crash: no crash update when kexec in progress Message-ID: References: <20240911112111.108056-1-sourabhjain@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 On 09/12/24 at 01:33pm, Sourabh Jain wrote: > Hello Baoquan, > > On 11/09/24 19:50, Baoquan He wrote: > > On 09/11/24 at 04:51pm, Sourabh Jain wrote: > > > The following errors are observed when kexec is done with SMT=off on > > > powerpc. > > > > > > [ 358.458385] Removing IBM Power 842 compression device > > > [ 374.795734] kexec_core: Starting new kernel > > > [ 374.795748] kexec: Waking offline cpu 1. > > > [ 374.875695] crash hp: kexec_trylock() failed, elfcorehdr may be inaccurate > > > [ 374.935833] kexec: Waking offline cpu 2. > > > [ 375.015664] crash hp: kexec_trylock() failed, elfcorehdr may be inaccurate > > > snip.. > > > [ 375.515823] kexec: Waking offline cpu 6. > > > [ 375.635667] crash hp: kexec_trylock() failed, elfcorehdr may be inaccurate > > > [ 375.695836] kexec: Waking offline cpu 7. > > > > > > To avoid kexec kernel boot failure on PowerPC, all the present CPUs that > > > are offline are brought online during kexec. For more information, refer > > > to commit e8e5c2155b00 ("powerpc/kexec: Fix orphaned offline CPUs across > > > kexec"). Bringing the CPUs online triggers the crash hotplug handler, > > > crash_handle_hotplug_event(), to update the kdump image. Since the > > > system is on the kexec kernel boot path and the kexec lock is held, the > > > crash_handle_hotplug_event() function fails to acquire the same lock to > > > update the kdump image, resulting in the error messages mentioned above. > > > > > > To fix this, return from crash_handle_hotplug_event() without printing > > > the error message if kexec is in progress. > > > > > > The same applies to the crash_check_hotplug_support() function. Return > > > 0 if kexec is in progress because kernel is not in a position to update > > > the kdump image. > > LGTM, thanks. > > > > Acked-by: Baoquan he > > Thank you for the Ack! > > My understanding is that this patch will go upstream via the linux-next > tree, as it is based on > https://lore.kernel.org/all/20240902034708.88EC1C4CEC2@smtp.kernel.org/ > which is already part of the linux-next master branch. - Sourabh Jain Then you should mark it as [PATCH linux-next] in subject. Since this patch is in generic code, it needs Andrew's help to pick it. Let's wait and see if Andrew need a new post to change the subject. Thanks Baoquan