linux-kernel - Re: [PATCH V3 2/3] perf tool: Move cpumode resolve code to add_callchain

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Date:	Tue, 18 Nov 2014 09:24:55 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	kan.liang@...el.com
Cc:	acme@...nel.org, a.p.zijlstra@...llo.nl, eranian@...gle.com,
	linux-kernel@...r.kernel.org, mingo@...hat.com, paulus@...ba.org,
	ak@...ux.intel.com
Subject: Re: [PATCH V3 2/3] perf tool: Move cpumode resolve code to
 add_callchain_ip

On Fri, Nov 14, 2014 at 08:44:11AM -0500, kan.liang@...el.com wrote:
> From: Kan Liang <kan.liang@...el.com>
> 
> Move the cpumode resolve code to add_callchain_ip function.
> No change in behavior.
> 
> Signed-off-by: Kan Liang <kan.liang@...el.com>
> ---
>  tools/perf/util/machine.c | 62 ++++++++++++++++++++++-------------------------
>  1 file changed, 29 insertions(+), 33 deletions(-)
> 
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index d97309c..dd8496a 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -1384,11 +1384,35 @@ struct mem_info *sample__resolve_mem(struct perf_sample *sample,
>  static int add_callchain_ip(struct thread *thread,
>  			    struct symbol **parent,
>  			    struct addr_location *root_al,
> -			    int cpumode,
> +			    u8 cpumode,

Andi's patch got in:
b3340a5 perf callchain: Support handling complete branch stacks as histograms

and it uses the cpumode check for -1, so it needs to stay int, otherwise
there's a compilation failure:

  CC       util/machine.o
util/machine.c: In function ‘add_callchain_ip’:
util/machine.c:1419:14: error: comparison is always false due to limited range of data type [-Werror=type-limits]
  if (cpumode == -1)
              ^


jirka
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