From: Borislav Petkov <bp@alien8.de>
To: "河合英宏 / KAWAI，HIDEHIRO" <hidehiro.kawai.ez@hitachi.com>
Cc: "Jonathan Corbet" <corbet@lwn.net>,
"Peter Zijlstra" <peterz@infradead.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Vivek Goyal" <vgoyal@redhat.com>, "Baoquan He" <bhe@redhat.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Michal Hocko" <mhocko@kernel.org>,
"平松雅巳 / HIRAMATU，MASAMI" <masami.hiramatsu.pt@hitachi.com>
Subject: Re: [V5 PATCH 3/4] kexec: Fix race between panic() and crash_kexec() called directly
Date: Wed, 2 Dec 2015 16:40:23 +0100 [thread overview]
Message-ID: <20151202154023.GH3783@pd.tnic> (raw)
In-Reply-To: <04EAB7311EE43145B2D3536183D1A84454A3B032@GSjpTKYDCembx31.service.hitachi.net>
On Wed, Dec 02, 2015 at 11:57:38AM +0000, 河合英宏 / KAWAI，HIDEHIRO wrote:
> We can do so, but I think resetting panic_cpu always would be
> simpler and safer.
Well, I think executing code needlessly *especially* at panic time is
not all that rosy either.
Besides something like this:
static bool kexec_failed;
...
if (crash_kexec_post_notifiers && !kexec_failed)
kexec_failed = __crash_kexec(NULL);
is as simple as it gets.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
next prev parent reply other threads:[~2015-12-02 15:40 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-20 9:36 [V5 PATCH 0/4] Fix race issues among panic, NMI and crash_kexec Hidehiro Kawai
2015-11-20 9:36 ` [V5 PATCH 1/4] panic/x86: Fix re-entrance problem due to panic on NMI Hidehiro Kawai
2015-11-23 18:49 ` Borislav Petkov
2015-11-24 4:06 ` 河合英宏 / KAWAI，HIDEHIRO
2015-11-24 12:45 ` Michal Hocko
2015-11-24 15:05 ` Steven Rostedt
2015-11-24 15:12 ` Steven Rostedt
2015-11-24 20:27 ` Michal Hocko
2015-11-24 20:45 ` Steven Rostedt
2015-11-20 9:36 ` [V5 PATCH 2/4] panic/x86: Allow cpus to save registers even if they are looping in NMI context Hidehiro Kawai
2015-11-24 10:48 ` Borislav Petkov
2015-11-24 19:37 ` Steven Rostedt
2015-11-24 20:16 ` Borislav Petkov
2015-11-25 5:57 ` 河合英宏 / KAWAI，HIDEHIRO
2015-11-25 5:51 ` 河合英宏 / KAWAI，HIDEHIRO
2015-11-25 8:56 ` Borislav Petkov
2015-11-25 9:46 ` 河合英宏 / KAWAI，HIDEHIRO
2015-11-25 9:57 ` Borislav Petkov
2015-11-25 15:11 ` 河合英宏 / KAWAI，HIDEHIRO
2015-11-24 12:58 ` Michal Hocko
2015-12-03 2:23 ` 河合英宏 / KAWAI，HIDEHIRO
2015-11-20 9:36 ` [V5 PATCH 3/4] kexec: Fix race between panic() and crash_kexec() called directly Hidehiro Kawai
2015-11-24 13:05 ` Michal Hocko
2015-11-24 20:35 ` Steven Rostedt
2015-11-25 6:28 ` 河合英宏 / KAWAI，HIDEHIRO
2015-11-25 9:54 ` Borislav Petkov
2015-12-02 11:57 ` 河合英宏 / KAWAI，HIDEHIRO
2015-12-02 15:40 ` Borislav Petkov [this message]
2015-12-03 2:01 ` 河合英宏 / KAWAI，HIDEHIRO
2015-12-03 9:35 ` Borislav Petkov
2015-12-03 11:29 ` 河合英宏 / KAWAI，HIDEHIRO
2015-12-03 12:22 ` Borislav Petkov
2015-11-20 9:36 ` [V5 PATCH 4/4] x86/apic: Introduce apic_extnmi boot option Hidehiro Kawai
2015-11-25 11:49 ` Borislav Petkov
2015-11-25 15:29 ` 河合英宏 / KAWAI，HIDEHIRO
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