linux-kernel - Re: [PATCH v2 1/2] vfs: Define new syscall getumask.

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Date:	Wed, 13 Apr 2016 15:27:15 +0000 (UTC)
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	"Richard W.M. Jones" <rjones@...hat.com>
Cc:	Cyrill Gorcunov <gorcunov@...il.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>, luto@...nel.org,
	viro@...iv.linux.org.uk, zab@...hat.com, emunson@...mai.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>, josh@...htriplett.org,
	Pavel Emelyanov <xemul@...allels.com>, sfr@...b.auug.org.au,
	Milosz Tanski <milosz@...in.com>,
	rostedt <rostedt@...dmis.org>, arnd@...db.de,
	ebiederm@...ssion.com, iulia manda21 <iulia.manda21@...il.com>,
	dave hansen <dave.hansen@...ux.intel.com>, mguzik@...hat.com,
	adobriyan@...il.com, Davidlohr Bueso <dave@...olabs.net>,
	linux-api <linux-api@...r.kernel.org>, fw@...eb.enyo.de
Subject: Re: [PATCH v2 1/2] vfs: Define new syscall getumask.

----- On Apr 13, 2016, at 9:57 AM, Richard W.M. Jones rjones@...hat.com wrote:

> On Wed, Apr 13, 2016 at 04:20:32PM +0300, Cyrill Gorcunov wrote:
>> On Wed, Apr 13, 2016 at 01:57:51PM +0100, Richard W.M. Jones wrote:
>> > Define a system call for reading the current umask value.
>> > 
>> > Signed-off-by: Richard W.M. Jones <rjones@...hat.com>
>> 
>> Btw don't we have to declare it in include/uapi/asm-generic/unistd.h as well?
> 
> Yes, I think I do.  I was following pwritev2 which wasn't added
> to this file, but other recent system calls (mlock2, copy_file_range)
> were added.
> 
> TBH the documentation for this file is not very clear...

asm-generic/unistd.h defines the system call for a few
architectures. 

grep -r asm-generic/unistd.h arch/*/include/
arch/arc/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/arc/include/uapi/asm/unistd.h:/* Generic syscall (fs/filesystems.c - lost in asm-generic/unistd.h */
arch/arm64/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/c6x/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/h8300/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/hexagon/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/metag/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/nios2/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/openrisc/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/score/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/tile/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>
arch/unicore32/include/uapi/asm/unistd.h:#include <asm-generic/unistd.h>

Wiring up the system call in this header means adding
support for this system call on all those architectures.

Thanks,

Mathieu

> 
> Rich.
> 
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com