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

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Date:	Wed, 14 Feb 2007 23:21:37 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
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.

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?

> +#ifdef MARK_POLYMORPHIC

What's this?  Is it commented somewhere?  (It should be...)

> +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?

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

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