linux-kernel - Re: [PATCH -v6 08/13] tracing: add IRQENTRY

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Date:	Mon, 9 Nov 2009 03:26:42 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Wu Zhangjin <wuzhangjin@...il.com>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, Thomas Gleixner <tglx@...utronix.de>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Richard Sandiford <rdsandiford@...glemail.com>,
	Nicholas Mc Guire <der.herr@...r.at>,
	David Daney <ddaney@...iumnetworks.com>,
	Adam Nemet <anemet@...iumnetworks.com>,
	Patrik Kluba <kpajko79@...il.com>
Subject: Re: [PATCH -v6 08/13] tracing: add IRQENTRY_EXIT section for MIPS

On Mon, Oct 26, 2009 at 11:13:25PM +0800, Wu Zhangjin wrote:
> This patch add a new section for MIPS to record the block of the hardirq
> handling for function graph tracer(print_graph_irq) via adding the
> __irq_entry annotation to the the entrypoints of the hardirqs(the block
> with irq_enter()...irq_exit()).
> 
> Thanks goes to Steven & Frederic Weisbecker for their feedbacks.
> 
> Signed-off-by: Wu Zhangjin <wuzhangjin@...il.com>
> +
> +/*
> + * do_IRQ handles all normal device IRQ's (the special
> + * SMP cross-CPU interrupts have their own specific
> + * handlers).
> + */
> +unsigned int __irq_entry do_IRQ(unsigned int irq)
> +{
> +	irq_enter();
> +	__DO_IRQ_SMTC_HOOK(irq);
> +	generic_handle_irq(irq);
> +	irq_exit();
> +
> +	return 1;
> +}



Nano-neat:

Why is it returning a value, it doesn't seem needed (the macro
version didn't)?

Anyway, that looks good to me. I hope the changes from macro
to function calls will be ack by the MIPS maintainers.

Reviewed-by: Frederic Weisbecker <fweisbec@...il.com>

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