linux-kernel - Re: [PATCH] scripts/checksyscalls.sh: only whine perf_counter

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Date:	Sun, 14 Jun 2009 13:20:22 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	Paul Mundt <lethal@...ux-sh.org>, akpm <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/checksyscalls.sh: only whine perf_counter_open when supported

On Sun, Jun 14, 2009 at 06:55:45AM -0400, Mike Frysinger wrote:
> On Sun, Jun 14, 2009 at 06:11, Paul Mundt wrote:
> > On Sun, Jun 14, 2009 at 05:55:44AM -0400, Mike Frysinger wrote:
> >> On Sun, Jun 14, 2009 at 05:37, Paul Mundt wrote:
> >> >> On Fri, Jun 12, 2009 at 07:29, Mike Frysinger wrote:
> >> >> If the port does not support HAVE_PERF_COUNTERS, then they can't support
> >> >> the perf_counter_open syscall either. ??Rather than forcing everyone to add
> >> >> an ignore (or suffer the warning until they get around to implementing
> >> >> support), only whine about the syscall when applicable.
> >> >
> >> > I fail to see why this is necessary? cond_syscall() takes care of this in
> >> > the not implemented case, the same as every other syscall backing some
> >> > feature that has yet to be implemented.
> >>
> >> i dont think we should go hassling every arch maintainer when a new
> >> syscall is added that requires arch-specific support for optional
> >> features (especially when said features are debug in nature).  if
> >> wiring up the syscall is the only work because the code is all common
> >> (like the pread/pwrite functions), then np of course.
> >
> > Perhaps not, but I do prefer to have the script whine at me when a new
> > syscall pops up, just so I know when I have to start caring about a new
> > feature.
> 
> assuming you can find any useful info about said feature ;)
> 
> > If a generic implementation becomes available, then it can be
> > supported without having to backtrack and update place-holders.
> 
> this is a good convincing point.  Sam: please drop this patch if you
> did get a chance to queue it up.

OK - dropped.

	Sam
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