linux-kernel - Re: [PATCH v5 0/7] arm64: Add ftrace support

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Message-ID: <20140311220226.452632a6@gandalf.local.home>
Date:	Tue, 11 Mar 2014 22:02:26 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	Will Deacon <will.deacon@....com>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"tim.bird@...ymobile.com" <tim.bird@...ymobile.com>,
	"gkulkarni@...iumnetworks.com" <gkulkarni@...iumnetworks.com>,
	"dsaxena@...aro.org" <dsaxena@...aro.org>,
	"arndb@...db.de" <arndb@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 0/7] arm64: Add ftrace support

On Wed, 12 Mar 2014 10:47:20 +0900
AKASHI Takahiro <takahiro.akashi@...aro.org> wrote:


> This happens when a header file, elf.h, on "your host machine" does not have
> definitions of EM_AARCH64 nor R_AARCH64_ABS64 because "recordmcount" is a binary
> utility on host(x86), not target. It is very likely for most distros.
> (I mentioned this in the cover letter, but the description might not be clear.)
> 
> Possible solutions are:
> 1) Define both macros directly in scripts/recordmcount.c
> 2) Use perl version of recordmcount
> 
> Currently I take 1), but it is a workaround.
> 2) should work with my current patch, too. But you need to remove HAVE_C_RECORDCOUNT
> from arm64/Kconfig.
> 
> Which one do you prefer? I will include a fix for 1) in the next revision, anyway.

Or even option 3)

3) I can update the main Makefile to check to see if EM_<ARCH> exists
in the elf.h header, and if not, we use the perl version and undef
HAVE_C_RECORDMCOUNT.

-- Steve

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