linux-kernel - Re: [PATCH 02/05] Linux Kernel Markers, architecture independant code.

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Message-ID: <20070215191222.GB31359@Krystal>
Date:	Thu, 15 Feb 2007 14:12:22 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, systemtap@...rces.redhat.com,
	ltt-dev@...fik.org
Subject: Re: [PATCH 02/05] Linux Kernel Markers, architecture independant code.

* Andrew Morton (akpm@...ux-foundation.org) wrote:
> On Sun, 11 Feb 2007 15:03:24 -0500 Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> 
> > Linux Kernel Markers, architecture independant code.
> > 
> > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> > 
> > ...
> >
> > +
> > +#ifndef MARK
> > +#define MARK GEN_MARK
> > +#define MARK_ENABLE_TYPE GEN_MARK_ENABLE_TYPE
> > +#define MARK_ENABLE_IMMEDIATE_OFFSET GEN_MARK_ENABLE_IMMEDIATE_OFFSET
> > +#endif
> 
> Also perhaps this nastiness can go away once each architecture has
> asm/marker.h?
> 
Yes, absolutely.

> > +#ifdef MARK_POLYMORPHIC
> 
> What's this?  Is it commented somewhere?  (It should be...)
> 

No, but should be : it is defined by the architecture's marker.h when
the marker flavor has to do code motification when the marker state is
modified.


> > +static int marker_set_ins_enable(void *address, char enable)
> > +{
> > +#ifdef CONFIG_X86_32
> > +	return arch_marker_set_ins_enable(address, enable);
> > +#else
> > +	char newi[MARK_ENABLE_IMMEDIATE_OFFSET+1];
> > +	int size = MARK_ENABLE_IMMEDIATE_OFFSET+sizeof(MARK_ENABLE_TYPE);
> > +
> > +	memcpy(newi, address, size);
> > +	MARK_ENABLE(&newi[0]) = enable;
> > +	memcpy(address, newi, size);
> > +	flush_icache_range((unsigned long)address, size);
> > +	return 0;
> > +#endif //CONFIG_X86_32
> > +}
> 
> eww.  Can we put a suitable arch_marker_set_ins_enable() into each arch's
> marker.h?
> 

Or maybe put that in asm-generic so we do not duplicate code.

> > +#else
> > +static int marker_set_ins_enable(void *address, char enable)
> > +{
> > +	return -EPERM;
> > +}
> > +#endif //MARK_POLYMORPHIC
> > +
> >
> > ...
> >
> 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Candidate, École Polytechnique de Montréal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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