linux-kernel - Re: [PATCH 16/37] x86, pkeys: notify userspace about protection key faults

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Date:	Fri, 27 Nov 2015 10:49:59 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Hansen <dave@...1.net>
cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	dave.hansen@...ux.intel.com
Subject: Re: [PATCH 16/37] x86, pkeys: notify userspace about protection key
 faults

On Mon, 16 Nov 2015, Dave Hansen wrote:
> Note that _pkey is a 64-bit value.  The current hardware only
> supports 4-bit protection keys.  We do this because there is
> _plenty_ of space in _sigfault and it is possible that future
> processors would support more than 4 bits of protection keys.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> ---
> 
>  b/arch/x86/include/asm/pgtable_types.h |    5 ++
>  b/arch/x86/mm/fault.c                  |   59 ++++++++++++++++++++++++++++++++-
>  b/include/uapi/asm-generic/siginfo.h   |   17 ++++++---
>  b/kernel/signal.c                      |    4 ++

I'd be nice to split the core changes from the x86 implementation.

Other than that: Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
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