linux-kernel - Re: [PATCH v3 40/71] ARC: OProfile support

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Date:	Tue, 29 Jan 2013 17:05:47 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:	<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<arnd@...db.de>, Robert Richter <rric@...nel.org>,
	<oprofile-list@...ts.sf.net>
Subject: Re: [PATCH v3 40/71] ARC: OProfile support

Hi Vineet,

On 24/01/13 11:06, Vineet Gupta wrote:
> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
> Cc: Robert Richter <rric@...nel.org>
> Cc: oprofile-list@...ts.sf.net
> ---
>  arch/arc/Kconfig           |    1 +
>  arch/arc/Makefile          |    2 ++
>  arch/arc/oprofile/Makefile |    9 +++++++++
>  arch/arc/oprofile/common.c |   22 ++++++++++++++++++++++
>  4 files changed, 34 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arc/oprofile/Makefile
>  create mode 100644 arch/arc/oprofile/common.c
> 
> diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
> index 409b937..405ea7a 100644
> --- a/arch/arc/Kconfig
> +++ b/arch/arc/Kconfig
> @@ -25,6 +25,7 @@ config ARC
>  	select HAVE_ARCH_TRACEHOOK
>  	select HAVE_GENERIC_HARDIRQS
>  	select HAVE_MEMBLOCK
> +	select HAVE_OPROFILE
>  	select IRQ_DOMAIN
>  	select MODULES_USE_ELF_RELA
>  	select NO_BOOTMEM
> diff --git a/arch/arc/Makefile b/arch/arc/Makefile
> index 4247f48..4f28f5b 100644
> --- a/arch/arc/Makefile
> +++ b/arch/arc/Makefile
> @@ -100,6 +100,8 @@ ifneq ($(platform-y),)
>  core-y		+= arch/arc/plat-$(PLATFORM)/
>  endif
>  
> +drivers-$(CONFIG_OPROFILE)	+= arch/arc/oprofile/
> +
>  libs-y		+= arch/arc/lib/ $(LIBGCC)
>  
>  #default target for make without any arguements.
> diff --git a/arch/arc/oprofile/Makefile b/arch/arc/oprofile/Makefile
> new file mode 100644
> index 0000000..ce417a6
> --- /dev/null
> +++ b/arch/arc/oprofile/Makefile
> @@ -0,0 +1,9 @@
> +obj-$(CONFIG_OPROFILE) += oprofile.o
> +
> +DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
> +		oprof.o cpu_buffer.o buffer_sync.o \
> +		event_buffer.o oprofile_files.o \
> +		oprofilefs.o oprofile_stats.o \
> +		timer_int.o )
> +
> +oprofile-y	:= $(DRIVER_OBJS) common.o
> diff --git a/arch/arc/oprofile/common.c b/arch/arc/oprofile/common.c
> new file mode 100644
> index 0000000..917ae16
> --- /dev/null
> +++ b/arch/arc/oprofile/common.c
> @@ -0,0 +1,22 @@
> +/*
> + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * Based on orig code from @author John Levon <levon@...ementarian.org>
> + */
> +
> +#include <linux/oprofile.h>
> +#include <linux/perf_event.h>
> +
> +int __init oprofile_arch_init(struct oprofile_operations *ops)
> +{
> +	return oprofile_perf_init(ops);

You don't appear to define CONFIG_HW_PERF_EVENTS, so
include/linux/oprofile.h will presumably define oprofile_perf_init as
just a pr_info(...); return -ENODEV;

Similarly drivers/oprofile/oprofile_perf.o doesn't seem to be being built.

I'm probably missing something somewhere?

Cheers
James

> +}
> +
> +void oprofile_arch_exit(void)
> +{
> +	oprofile_perf_exit();
> +}
> 

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