linux-kernel - Re: [PATCH -v5 09/11] tracing: add IRQENTRY

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Date:	Mon, 26 Oct 2009 01:36:28 +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>,
	Nicholas Mc Guire <der.herr@...r.at>,
	Richard Sandiford <rdsandiford@...glemail.com>,
	David Daney <ddaney@...iumnetworks.com>,
	Adam Nemet <anemet@...iumnetworks.com>,
	Patrik Kluba <kpajko79@...il.com>
Subject: Re: [PATCH -v5 09/11] tracing: add IRQENTRY_EXIT for MIPS

2009/10/25 Wu Zhangjin <wuzhangjin@...il.com>:
> This patch fix the following error with FUNCTION_GRAPH_TRACER=y:
>
> kernel/built-in.o: In function `print_graph_irq':
> trace_functions_graph.c:(.text+0x6dba0): undefined reference to `__irqentry_text_start'
> trace_functions_graph.c:(.text+0x6dba8): undefined reference to `__irqentry_text_start'
> trace_functions_graph.c:(.text+0x6dbd0): undefined reference to `__irqentry_text_end'
> trace_functions_graph.c:(.text+0x6dbd4): undefined reference to `__irqentry_text_end'
>
> (This patch is need to support function graph tracer of MIPS)


If you want to enjoy this section, you'd need to tag the
mips irq entry functions with "__irq_entry"  :)

I guess there is a do_IRQ() in mips that is waiting for that (and
probably some others).
The effect is that interrupt areas are cut with a pair of arrows
in the trace, so that you more easily spot interrupts in the traces

May be I missed this part in another patch in this series though...
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