linux-kernel - Re: [PATCH v2 0/3] Fix dump-capture kernel hangs with notsc

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Message-ID: <87twf4xvpd.fsf@x220.int.ebiederm.org>
Date:	Mon, 01 Aug 2016 12:09:18 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Wei\, Jiangang" <weijg.fnst@...fujitsu.com>
Cc:	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"kexec\@lists.infradead.org" <kexec@...ts.infradead.org>,
	"tglx\@linutronix.de" <tglx@...utronix.de>,
	"bhe\@redhat.com" <bhe@...hat.com>,
	"xpang\@redhat.com" <xpang@...hat.com>,
	"kernel\@kyup.com" <kernel@...p.com>,
	"x86\@kernel.org" <x86@...nel.org>,
	"hpa\@zytor.com" <hpa@...or.com>,
	"mingo\@redhat.com" <mingo@...hat.com>
Subject: Re: [PATCH v2 0/3] Fix dump-capture kernel hangs with notsc

"Wei, Jiangang" <weijg.fnst@...fujitsu.com> writes:

> Ping ...
> May I ask for some community attention to this series?
> I purpose is fixing  the dump-capture kernel hangs in
> calibrate_delay_converge() while specifying notsc.

Did you not see my reply to patch 3/3?

The short version of my feedback is that you seem to be fixing a case
that should not exist.  So the good fix is to skip completely past
virtual wire mode and into full apic mode as soon as possible.

For a subset of cases the code already supports that.

Eric