linux-kernel - RE: Re[6]: 3.4-rc smpboot: do_boot

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Message-ID: <1A7043D5F58CCB44A599DFD55ED4C9484693815B@fmsmsx115.amr.corp.intel.com>
Date:	Fri, 16 Oct 2015 01:06:06 +0000
From:	"Brown, Len" <len.brown@...el.com>
To:	shrybman <shrybman@...savvy.com>,
	Donald Parsons <dparsons@...ghtdsl.net>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Re[6]: 3.4-rc smpboot: do_boot_cpu failed(-1) to wakeup CPU#1

try booting upstream with "cpu_init_udelay=1".
If it works, then it actually implicates this commit:

a9bcaa02a5104ace6a9d9e4a9cd9192a9e7744d6
("x86/smpboot: Remove SIPI delays from cpu_up()")

Unfortunately the commit message for that on is erroneous --
"cpu_init_udelay=10000" is actually a NO-OP,
because that matches the compiled-in default.
Indeed, any non-zero value bug 10000 should work.

thanks,
-Len