linux-kernel - Re: qemu:arm test failure due to commit 8053871d0f7f (smp: Fix smp_call_function_single

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Message-ID: <20150418234050.GA5987@roeck-us.net>
Date:	Sat, 18 Apr 2015 16:40:50 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: qemu:arm test failure due to commit 8053871d0f7f (smp: Fix
 smp_call_function_single_async() locking)

On Sat, Apr 18, 2015 at 04:23:25PM -0700, Guenter Roeck wrote:
> Hi all,
> 
> my qemu test for arm:vexpress fails with the latest upstream kernel. It fails
> hard - I don't get any output from the console. Bisect points to commit
> 8053871d0f7f ("smp: Fix smp_call_function_single_async() locking").
> Reverting this commit fixes the problem.
> 

Additional observation: The system boots if I add "-smp cpus=4" to the qemu
options. It does still hang, however, with "-smp cpus=2" and "-smp cpus=3".

Guenter
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