linux-kernel - Re: [PATCH v7 6/7] arm64: ftrace: Add CALLER

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Message-ID: <535E3040.7090402@linaro.org>
Date:	Mon, 28 Apr 2014 19:41:04 +0900
From:	AKASHI Takahiro <takahiro.akashi@...aro.org>
To:	Will Deacon <will.deacon@....com>
CC:	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"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 v7 6/7] arm64: ftrace: Add CALLER_ADDRx macros

Hi Will,

On 04/16/2014 10:52 PM, Will Deacon wrote:
> On Sat, Mar 15, 2014 at 05:45:52AM +0000, AKASHI Takahiro wrote:
>> CALLER_ADDRx returns caller's address at specified level in call stacks.
>> They are used for several tracers like irqsoff and preemptoff.
>> Strange to say, however, they are refered even without FTRACE.
>>
>> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
>> ---
>>   arch/arm64/include/asm/ftrace.h    | 13 ++++++++-
>>   arch/arm64/kernel/Makefile         |  3 ++-
>>   arch/arm64/kernel/return_address.c | 55 ++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 69 insertions(+), 2 deletions(-)
>>   create mode 100644 arch/arm64/kernel/return_address.c
>>
>> diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h
>> index ed5c448..c44c4b1 100644
>> --- a/arch/arm64/include/asm/ftrace.h
>> +++ b/arch/arm64/include/asm/ftrace.h
>> @@ -18,6 +18,7 @@
>>
>>   #ifndef __ASSEMBLY__
>>   extern void _mcount(unsigned long);
>> +extern void *return_address(unsigned int);
>>
>>   struct dyn_arch_ftrace {
>>   	/* No extra data needed for arm64 */
>> @@ -33,6 +34,16 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
>>   	 */
>>   	return addr;
>>   }
>> -#endif /* __ASSEMBLY__ */
>> +
>> +#define HAVE_ARCH_CALLER_ADDR
>> +
>> +#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
>> +#define CALLER_ADDR1 ((unsigned long)return_address(1))
>> +#define CALLER_ADDR2 ((unsigned long)return_address(2))
>> +#define CALLER_ADDR3 ((unsigned long)return_address(3))
>> +#define CALLER_ADDR4 ((unsigned long)return_address(4))
>> +#define CALLER_ADDR5 ((unsigned long)return_address(5))
>> +#define CALLER_ADDR6 ((unsigned long)return_address(6))
>> +#endif /* ifndef __ASSEMBLY__ */
>
> Hmm, I thought you were going to take a look at reworking the core code for
> this, as Steve and I suggested?
>
>    http://lists.infradead.org/pipermail/linux-arm-kernel/2014-March/240239.html

Sorry that I've forgot to submit a new revision with this change.
I will post it soon.

Thanks,
-Takahiro AKASHI

> Will
>
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