linux-kernel - Re: [PATCH 30/31] x86, pkeys: create an x86 arch_calc_vm_prot

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Message-ID: <alpine.DEB.2.11.1601082040190.3575@nanos>
Date:	Fri, 8 Jan 2016 20:40:31 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Hansen <dave@...1.net>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
	dave.hansen@...ux.intel.com
Subject: Re: [PATCH 30/31] x86, pkeys: create an x86 arch_calc_vm_prot_bits()
 for VMA flags

On Wed, 6 Jan 2016, Dave Hansen wrote:

> 
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> calc_vm_prot_bits() takes PROT_{READ,WRITE,EXECUTE} bits and
> turns them in to the vma->vm_flags/VM_* bits.  We need to do a
> similar thing for protection keys.
> 
> We take a protection key (4 bits) and encode it in to the 4
> VM_PKEY_* bits.
> 
> Note: this code is not new.  It was simply a part of the
> mprotect_pkey() patch in the past.  I broke it out for use
> in the execute-only support.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>

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