linux-kernel - Re: [PATCH 6/8] ptrace: arch

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Date:	Fri, 21 Mar 2008 15:10:51 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Roland McGrath <roland@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	David Miller <davem@...emloft.net>, sparclinux@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	Richard Henderson <rth@...ddle.net>, tony.luck@...el.com,
	linux-ia64@...r.kernel.org
Subject: Re: [PATCH 6/8] ptrace: arch_ptrace -ENOSYS return

On Fri, Mar 21, 2008 at 02:50:01PM +0100, Thomas Gleixner wrote:
> On Thu, 20 Mar 2008, Roland McGrath wrote:
> > > Wouldn't it be nicer to just let "arch_ptrace()" return a flag saying 
> > > whether it handled things or not?
> > 
> > It would certainly be nicer.  I would prefer:
> > 
> > extern int arch_ptrace(struct task_struct *child, long request,
> >        	    	       long addr, long data, long *retval);
> > 
> > where it returns an error code or it returns 0 and *retval is the value
> > or it returns 1 and it didn't do anything.
> >
> > So this ugliness seemed like a better bet than waiting for 20 more
> > arch sign-offs before any of it could go in.  You are certainly in a
> > position to just change the generic signature and make every arch do
> > the update (or fix your typos if you just tweak them all blind), and
> > let them grumble.  I did not presume to do so.
> 
> What about adding a CONFIG_ARCH_HAS_PTRACE2, which is set by the archs
> which are converted. For those which are not you add a fallback
> implementation:

HAVE_PTRACE2 or at least following the HAVE_* semnatic.
And then do:

config HAVE_PTRACE2
	def_bool n

In some common file.
Then arch files can do:
 config X86
	...
+	select HAVE_PTRACE2

	Sam
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