linux-kernel - Re: [PATCH 1/2] MIPS: Disable preemption during prctl(PR_SET_FP

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Message-ID: <20160510193246.GB7635@aurel32.net>
Date:	Tue, 10 May 2016 21:32:46 +0200
From:	Aurelien Jarno <aurelien@...el32.net>
To:	Paul Burton <paul.burton@...tec.com>
Cc:	linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
	"stable # v4 . 0+" <stable@...r.kernel.org>,
	Adam Buchbinder <adam.buchbinder@...il.com>,
	linux-kernel@...r.kernel.org, James Hogan <james.hogan@...tec.com>
Subject: Re: [PATCH 1/2] MIPS: Disable preemption during
 prctl(PR_SET_FP_MODE, ...)

On 2016-04-21 12:43, Paul Burton wrote:
> Whilst a PR_SET_FP_MODE prctl is performed there are decisions made
> based upon whether the task is executing on the current CPU. This may
> change if we're preempted, so disable preemption to avoid such changes
> for the lifetime of the mode switch.
> 
> Signed-off-by: Paul Burton <paul.burton@...tec.com>
> Fixes: 9791554b45a2 ("MIPS,prctl: add PR_[GS]ET_FP_MODE prctl options for MIPS")
> Cc: stable <stable@...r.kernel.org> # v4.0+
> ---
> 
>  arch/mips/kernel/process.c | 4 ++++
>  1 file changed, 4 insertions(+)

Both patches fixes building pillow, which otherwise hangs running
"python setup.py build" [1]. The setup code uses the multiprocessing
package, and it hangs in a call to PR_SET_FP_MODE.

You can therefore add for both patches:

Tested-by: Aurelien Jarno <aurelien@...el32.net>

Thanks,
Aurelien

[1] https://buildd.debian.org/status/fetch.php?pkg=pillow&arch=mips&ver=3.2.0-1&stamp=1460852908

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@...el32.net                 http://www.aurel32.net