linux-kernel - Re: [PATCH/RFT 0/2] regression fix: "smpboot: do_boot

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Date:	Fri, 16 Oct 2015 01:42:26 -0400
From:	Donald Parsons <dparsons@...ghtdsl.net>
To:	Len Brown <lenb@...nel.org>
Cc:	x86@...nel.org, shrybman@...savvy.com, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFT 0/2] regression fix: "smpboot: do_boot_cpu
 failed(-1) to wakeup CPU#1"

On Fri, 2015-10-16 at 00:14 -0400, Len Brown wrote:
> Shane, Donald,
> Please test this pair of patches.
> 
> If the default kernel still has a problem booting CPU #1 on your Core2 system,
> "cpu_init_udelay=10000" should get you back to the legacy delays.

Applied patches to Linus' 4.3-rc4 (with none of our recently discussed
changes.) 

Result missing CPU is back!

I also tried the "cpu_init_udelay=1" with rc5 and that also gave me back
the missing CPU?  Previously I had tried "cpu_init_udelay=10000" and it
did not get missing CPU back (with rc3 or rc4).

I can do more testing if you need it.

Thanks,
Don



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