linux-kernel - Re: [PATCH 13/41] perf tools: Add machine__kernel

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Message-ID: <53C68A9E.6060302@intel.com>
Date:	Wed, 16 Jul 2014 17:22:22 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 13/41] perf tools: Add machine__kernel_ip()

On 16/07/2014 5:15 p.m., Jiri Olsa wrote:
> On Mon, Jul 14, 2014 at 01:02:37PM +0300, Adrian Hunter wrote:
>
> SNIP
>
>> +
>> +int machine__get_kernel_start(struct machine *machine)
>> +{
>> +	struct map *map = machine__kernel_map(machine, MAP__FUNCTION);
>> +	int err = 0;
>> +
>> +	/*
>> +	 * The only addresses above 2^63 are kernel addresses of a 64-bit
>> +	 * kernel.  Note that addresses are unsigned so that on a 32-bit system
>> +	 * all addresses including kernel addresses are less than 2^32.  In
>> +	 * that case (32-bit system), if the kernel mapping is unknown, all
>> +	 * addresses will be assumed to be in user space - see
>> +	 * machine__kernel_ip().
>> +	 */
>> +	machine->kernel_start = 1ULL << 63;
>> +	if (map) {
>> +		err = map__load(map, machine->symbol_filter);
>> +		if (map->start)
>> +			machine->kernel_start = map->start;
>> +	}
>> +	return err;
>> +}
>
> we just recently got machine__get_kernel_start_addr function,
> I think we want just one function for this

They do quite different things.

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