linux-kernel - Re: [PATCH 05/05] Linux Kernel Markers, non optimised architectures

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Date:	Fri, 12 Jan 2007 15:39:20 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC:	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Christoph Hellwig <hch@...radead.org>, ltt-dev@...fik.org,
	systemtap@...rces.redhat.com,
	Douglas Niehaus <niehaus@...s.ku.edu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 05/05] Linux Kernel Markers, non optimised architectures

Mathieu Desnoyers wrote:

> +#define MARK(name, format, args...) \
> +	do { \
> +		static marker_probe_func *__mark_call_##name = \
> +					__mark_empty_function; \
> +		volatile static char __marker_enable_##name = 0; \
> +		static const struct __mark_marker_c __mark_c_##name \
> +			__attribute__((section(".markers.c"))) = \
> +			{ #name, &__mark_call_##name, format } ; \
> +		static const struct __mark_marker __mark_##name \
> +			__attribute__((section(".markers"))) = \
> +			{ &__mark_c_##name, &__marker_enable_##name } ; \
> +		asm volatile ( "" : : "i" (&__mark_##name)); \
> +		__mark_check_format(format, ## args); \
> +		if (unlikely(__marker_enable_##name)) { \
> +			preempt_disable(); \
> +			(*__mark_call_##name)(format, ## args); \
> +			preempt_enable_no_resched(); \

Why not just preempt_enable() here?

-- 
SUSE Labs, Novell Inc.
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