linux-kernel - Re: [PATCH] perf probe: Move kernel_get_module_dso() to be built only with DWARF support

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Date:	Fri, 29 May 2015 08:45:16 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, wangnan0@...wei.com
Subject: Re: [PATCH] perf probe: Move kernel_get_module_dso() to be built
 only with DWARF support

Hi,

Wang has already sent the patch (and I acked). Please check this
https://lkml.org/lkml/2015/5/27/1013

Thank you!

On 2015/05/28 14:43, Namhyung Kim wrote:
> The kernel_get_module_dso() is called only from open_debugginfo() and
> the latter is defined only if HAVE_DWARF_SUPPORT is defined.  So build
> without dwarf failed like below:
> 
>     CC       util/probe-event.o
>   util/probe-event.c:203:12: error: ‘kernel_get_module_dso’ defined but not used
>                                     [-Werror=unused-function]
>    static int kernel_get_module_dso(const char *module, struct dso **pdso)
>               ^
>   cc1: all warnings being treated as errors
>   /home/namhyung/project/linux/tools/build/Makefile.build:68:
>     recipe for target 'util/probe-event.o' failed
>   make[5]: *** [util/probe-event.o] Error 1
> 
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/probe-event.c | 65 +++++++++++++++++++++----------------------
>  1 file changed, 32 insertions(+), 33 deletions(-)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index b0b8a8080009..c28610e78901 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -199,39 +199,6 @@ static void put_target_map(struct map *map, bool user)
>  	}
>  }
>  
> -
> -static int kernel_get_module_dso(const char *module, struct dso **pdso)
> -{
> -	struct dso *dso;
> -	struct map *map;
> -	const char *vmlinux_name;
> -	int ret = 0;
> -
> -	if (module) {
> -		list_for_each_entry(dso, &host_machine->kernel_dsos.head,
> -				    node) {
> -			if (strncmp(dso->short_name + 1, module,
> -				    dso->short_name_len - 2) == 0)
> -				goto found;
> -		}
> -		pr_debug("Failed to find module %s.\n", module);
> -		return -ENOENT;
> -	}
> -
> -	map = host_machine->vmlinux_maps[MAP__FUNCTION];
> -	dso = map->dso;
> -
> -	vmlinux_name = symbol_conf.vmlinux_name;
> -	dso->load_errno = 0;
> -	if (vmlinux_name)
> -		ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL);
> -	else
> -		ret = dso__load_vmlinux_path(dso, map, NULL);
> -found:
> -	*pdso = dso;
> -	return ret;
> -}
> -
>  static int convert_exec_to_group(const char *exec, char **result)
>  {
>  	char *ptr1, *ptr2, *exec_copy;
> @@ -377,6 +344,38 @@ static int get_alternative_line_range(struct debuginfo *dinfo,
>  	return ret;
>  }
>  
> +static int kernel_get_module_dso(const char *module, struct dso **pdso)
> +{
> +	struct dso *dso;
> +	struct map *map;
> +	const char *vmlinux_name;
> +	int ret = 0;
> +
> +	if (module) {
> +		list_for_each_entry(dso, &host_machine->kernel_dsos.head,
> +				    node) {
> +			if (strncmp(dso->short_name + 1, module,
> +				    dso->short_name_len - 2) == 0)
> +				goto found;
> +		}
> +		pr_debug("Failed to find module %s.\n", module);
> +		return -ENOENT;
> +	}
> +
> +	map = host_machine->vmlinux_maps[MAP__FUNCTION];
> +	dso = map->dso;
> +
> +	vmlinux_name = symbol_conf.vmlinux_name;
> +	dso->load_errno = 0;
> +	if (vmlinux_name)
> +		ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL);
> +	else
> +		ret = dso__load_vmlinux_path(dso, map, NULL);
> +found:
> +	*pdso = dso;
> +	return ret;
> +}
> +
>  /* Open new debuginfo of given module */
>  static struct debuginfo *open_debuginfo(const char *module, bool silent)
>  {
> 


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@...achi.com
--
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