lkml.org 
[lkml]   [2017]   [Jul]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC v6 13/62] powerpc: track allocation status of all pkeys
On Thu, Jul 27, 2017 at 11:01:44AM -0300, Thiago Jung Bauermann wrote:
>
> Hello Ram,
>
> I'm still going through the patches and haven't formed a full picture of
> the feature in my mind yet, so my comments today won't be particularly
> insightful...
>
> But hopefully the comments that I currently have will be helpful anyway.

sure. thanx for taking the time to look through the patches.

>
> Ram Pai <linuxram@us.ibm.com> writes:
> > diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
> > index 203d7de..09b268e 100644
> > --- a/arch/powerpc/include/asm/pkeys.h
> > +++ b/arch/powerpc/include/asm/pkeys.h
> > @@ -2,21 +2,87 @@
> > #define _ASM_PPC64_PKEYS_H
> >
> > extern bool pkey_inited;
> > -#define ARCH_VM_PKEY_FLAGS 0
> > +#define arch_max_pkey() 32
> > +#define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
> > + VM_PKEY_BIT3 | VM_PKEY_BIT4)
> > +/*
> > + * Bits are in BE format.
> > + * NOTE: key 31, 1, 0 are not used.
> > + * key 0 is used by default. It give read/write/execute permission.
> > + * key 31 is reserved by the hypervisor.
> > + * key 1 is recommended to be not used.
> > + * PowerISA(3.0) page 1015, programming note.
> > + */
> > +#define PKEY_INITIAL_ALLOCAION 0xc0000001
>
> There's a typo in the macro name, should be "ALLOCATION".

Thanks fixed it. The new version of the code, calculates the
allocation_mask at runtime, depending on the number of keys specified by
the device tree as well as other factors. So the above macro is
replaced by a variable 'initial_allocation_mask'.

RP

>
> --
> Thiago Jung Bauermann
> IBM Linux Technology Center

--
Ram Pai

\
 
 \ /
  Last update: 2017-07-30 00:44    [W:0.086 / U:0.256 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site