linux-kernel - Re: [PATCH] arm64/sve: <uapi/asm/ptrace.h> should not depend on <uapi/linux/prctl.h>

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Date:   Fri, 14 Jun 2019 11:23:55 +0100
From:   Will Deacon <will.deacon@....com>
To:     Dave Martin <Dave.Martin@....com>
Cc:     Anisse Astier <aastier@...ebox.fr>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Richard Henderson <richard.henderson@...aro.org>,
        Rich Felker <dalias@...ifal.cx>, linux-kernel@...r.kernel.org,
        Kristina Martsenko <kristina.martsenko@....com>,
        "Dmitry V . Levin" <ldv@...linux.org>,
        Ricardo Salveti <ricardo@...ndries.io>
Subject: Re: [PATCH] arm64/sve: <uapi/asm/ptrace.h> should not depend on
 <uapi/linux/prctl.h>

On Thu, Jun 13, 2019 at 06:14:44PM +0100, Dave Martin wrote:
> On Thu, Jun 13, 2019 at 06:38:01PM +0200, Anisse Astier wrote:
> >   */
> > -#define SVE_PT_VL_INHERIT		(PR_SVE_VL_INHERIT >> 16)
> > -#define SVE_PT_VL_ONEXEC		(PR_SVE_SET_VL_ONEXEC >> 16)
> > +#define SVE_PT_VL_INHERIT		(1 << 1) /* PR_SVE_VL_INHERIT */
> > +#define SVE_PT_VL_ONEXEC		(1 << 2) /* PR_SVE_SET_VL_ONEXEC */
> 
> Makes sense, but...
> 
> Since sve_context.h was already introduced to solve a closely related
> problem, I wonder whether we can provide shadow definitions there,
> similarly to way the arm64/include/uapi/asm/ptrace.h definitions are
> derived.  Although it's a slight abuse of that header, I think that
> would be my preferred approach.

Yes, that sounds better to me as well. Please send a v2!

Will