linux-kernel - Re: [PATCH 2/3] Kprobes: Define retval helper

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Message-ID: <20060809152018.GA17486@in.ibm.com>
Date:	Wed, 9 Aug 2006 20:50:18 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org,
	Prasanna S Panchamukhi <prasanna@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Jim Keniston <jkenisto@...ibm.com>, linux-arch@...r.kernel.org
Subject: Re: [PATCH 2/3] Kprobes: Define retval helper

On Wed, Aug 09, 2006 at 02:16:04PM +0100, David Howells wrote:
> Christoph Hellwig <hch@...radead.org> wrote:
> 
> > > > Good idea.  You should add parentheses around regs, otherwise the C
> > > > preprocessor might bite users.  Also the shouting name is quite ugly.
> > > > In fact it should probably go to asm/system.h or similar and not have
> > > > a kprobes name - it just extracts the return value from a struct pt_regs
> > > > after all.
> > > 
> > > Done! How does this look? I added it to asm/ptrace.h so it lives along
> > > with the instruction_pointer() definition.
> 
> I presume we don't care about return values that span multiple registers - for
> instance if you return a 64-bit value on i386 it'll wind up in EDX:EAX.

Yes. This helper is mostly to address the common case, not the 64-bit
one.

Ananth
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