Re: [PATCH 30/31] x86, pkeys: create an x86 arch_calc_vm_prot_bits() for VMA flags

[Thomas Gleixner]

On Wed, 6 Jan 2016, Dave Hansen wrote:

> 
> From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxxxx>

Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>