linux-kernel - Re: [PATCH 10/26] x86, pkeys: notify userspace about protection key faults

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Date:	Tue, 22 Sep 2015 13:29:56 -0700
From:	Dave Hansen <dave@...1.net>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 10/26] x86, pkeys: notify userspace about protection key
 faults

On 09/22/2015 01:27 PM, Thomas Gleixner wrote:
>> > 
>> > So I defined all the kernel-internal types as u16 since I *know* the
>> > size of the hardware.
>> > 
>> > The user-exposed ones should probably be a bit more generic.  I did just
>> > realize that this is an int and my proposed syscall is a long.  That I
>> > definitely need to make consistent.
>> > 
>> > Does anybody care whether it's an int or a long?
> long is frowned upon due to 32/64bit. Even if that key stuff is only
> available on 64bit for now ....

Well, it can be used by 32-bit apps on 64-bit kernels.

Ahh, that's why we don't see any longs in the siginfo.  So does that
mean 'int' is still our best bet in siginfo?


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