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

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Message-ID: <20140716141519.GC9441@krava.redhat.com>
Date:	Wed, 16 Jul 2014 16:15:19 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.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 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

jirka
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