linux-kernel - Re: [PATCH 1/6] alpha: Move __IGNORE* entries to non uapi header

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Message-ID: <20180811205901.gxbcn5vf4z36cozi@tower>
Date:   Sun, 12 Aug 2018 08:59:01 +1200
From:   Michael Cree <mcree@...on.net.nz>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Firoz Khan <firoz.khan@...aro.org>, linux-alpha@...r.kernel.org,
        rth@...ddle.net, ink@...assic.park.msu.ru, mattst88@...il.com,
        y2038@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, arnd@...db.de, deepa.kernel@...il.com
Subject: Re: [PATCH 1/6] alpha: Move __IGNORE* entries to non uapi header

On Sat, Aug 11, 2018 at 08:28:04PM +0100, Al Viro wrote:
> On Mon, Jul 16, 2018 at 03:53:53PM +0530, Firoz Khan wrote:
> > It is correct to keep __IGNORE* entry in non uapi header
> > asm/unistd.h while uapi/asm/unistd.h must hold information
> > only useful for user space applications.
> 
> > diff --git a/arch/alpha/include/uapi/asm/unistd.h b/arch/alpha/include/uapi/asm/unistd.h
> > index e153ca6..3bb6ac1 100644
> > --- a/arch/alpha/include/uapi/asm/unistd.h
> > +++ b/arch/alpha/include/uapi/asm/unistd.h
> > @@ -481,9 +481,4 @@
> >  #define __NR_pwritev2			521
> >  #define __NR_statx			522
> >  
> > -/* Alpha doesn't have protection keys. */
> > -#define __IGNORE_pkey_mprotect
> > -#define __IGNORE_pkey_alloc
> > -#define __IGNORE_pkey_free
> > -
> >  #endif /* _UAPI_ALPHA_UNISTD_H */
> 
> Hmm...  There's also
> 
> #define __IGNORE_alarm
> #define __IGNORE_creat

Tell you what, I wouldn't mind if the following ones were actually
implemented as syscalls in the kernel on Alpha:

> #define __IGNORE_getegid
> #define __IGNORE_geteuid
> #define __IGNORE_getgid
> #define __IGNORE_getpid
> #define __IGNORE_getppid
> #define __IGNORE_getuid

There's a growing number of software packages that are deciding
to sideskip glibc and call these syscalls directly.  Supporting
OSF's C ABI incompliant getxpid, etc., in such packages is not
easy and rather intrusive.

Cheers,
Michael.