linux-kernel - Re: [PATCH V8 36/44] memremap_pages: Reserve a PKS PKey for eventual use by PMEM

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Date:   Tue, 8 Feb 2022 15:42:16 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V8 36/44] memremap_pages: Reserve a PKS PKey for eventual
 use by PMEM

On Tue, Feb 08, 2022 at 03:22:22PM -0800, Dan Williams wrote:
> On Tue, Feb 8, 2022 at 2:48 PM Ira Weiny <ira.weiny@...el.com> wrote:
> [..]
> >  *      // 5) Add initial value to PKS_INIT_VALUE
> >  *      #define PKS_INIT_VALUE ((PKS_ALL_AD & (GENMASK(31, PKS_KEY_MAX * PKR_BITS_PER_PKEY))) | \
> >  *                              PKS_KEY_DEFAULT_INIT | \
> >  *                              PKS_KEY_MY_FEATURE_INIT | \
> 
> Does this compile? I.e. can you have a '|' operator with nothing on
> the right hand side?

Oops... yes but only because this is a comment (kernel doc) from the compiler
POV.  Thanks I'll fix it.

> 
> >  *                              )
> >  */
> >
> >
> > Let me know if this is clear enough?
> 
> Looks good to me.

Thanks,
Ira