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Date: Mon, 03 Aug 2015 20:06:07 +0900 From: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com> To: "Eric W. Biederman" <ebiederm@...ssion.com>, Vivek Goyal <vgoyal@...hat.com> CC: Andrew Morton <akpm@...ux-foundation.org>, linux-mips@...ux-mips.org, Baoquan He <bhe@...hat.com>, kexec@...ts.infradead.org, linux-kernel@...r.kernel.org, HATAYAMA Daisuke <d.hatayama@...fujitsu.com>, Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>, Daniel Walker <dwalker@...o99.com>, Ingo Molnar <mingo@...nel.org> Subject: Re: [RFC V2 PATCH 0/1] kexec: crash_kexec_post_notifiers boot option related fixes Hello Eric and Vivek, Do you have any comments? (2015/07/24 10:16), Hidehiro Kawai wrote: > This is a bugfix patch for crash_kexec_post_notifiers boot option > which allows users to call panic notifiers and kmsg dumpers before > kdump. > > This fixes one of the problems reported by Daniel Walker > (https://lkml.org/lkml/2015/6/24/44). > > Problem 1: > If crash_kexec_post_notifiers boot option is specified, some > shutting down process which assume other cpus are still alive > don't work properly. > > Problem 2 (addressed by this patch): > If crash_kexec_post_notifiers boot option is specified, register > information of other cpus are not saved to crash dumps. > > Following Vivek's opinion, this patch replaces smp_send_stop() > in panic() with suitable version for crash_kexec which saves > cpu states and other things like cleaning up VMX/SVM. Since this > needs architecture specific implementation and it's not so trivial, > this version only support for x86. So the problem 1, known to > happen on MIPS/OCTEON, is not addressed now. > > To keep the modification impact low, this patch doesn't change > the logic basically if crash_kexec_post_notifiers is not specified. > > Please note that crash_kexec() can be called directly without > entering panic(). Stopping other cpus functionality is still > needed in crash_kexec(). > > Changes in V2: > - Replace smp_send_stop() call with crash_kexec version which > saves cpu states and does cleanups instead of changing execution > flow > - Drop a fix for Problem 1 > - Drop other patches because they aren't needed anymore > > V1: https://lkml.org/lkml/2015/7/10/316 > > --- > > Hidehiro Kawai (1): > panic/x86: Replace smp_send_stop() with crash_kexec version > > > arch/x86/kernel/crash.c | 16 +++++++++++----- > kernel/panic.c | 29 +++++++++++++++++++++++------ > 2 files changed, 34 insertions(+), 11 deletions(-) > > -- Hidehiro Kawai Hitachi, Ltd. Research & Development Group -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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