linux-kernel - Re: [REVIEW][PATCH 12/20] signal/x86: Remove pkey parameter from bad_area

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Date:   Fri, 21 Sep 2018 14:34:49 +0200
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [REVIEW][PATCH 12/20] signal/x86: Remove pkey parameter from bad_area_nosemaphore

Dave Hansen <dave.hansen@...ux.intel.com> writes:

> On 09/18/2018 01:44 PM, Thomas Gleixner wrote:
>> On Tue, 18 Sep 2018, Eric W. Biederman wrote:
>>> The function bad_area_nosemaphore always sets si_code to SEGV_MAPERR
>>> and as such can never return a pkey parameter.  Therefore remove the
>>> unusable pkey parameter from bad_area_nosemaphore.
>
> The result of this looks nice to me.  It's especially nice to see the
> scope where we have to pass around the pkey get reduced.
>
> I also ran the pkey selftests against the current version of your
> siginfo-testing branch.  Everything passes fine on my pkey-enabled
> system.

Thank you for testing.  I was quite pleased myself when I saw that the
pkey scope was reduced.

Did you by any chance test powerpc?  As I also reduced the scope of pkey
there as well and that is also in my siginfo-testing branch.

Eric