linux-kernel - Re: [PATCH 3/8] perf symbol: Save vmlinux or kallsyms path loaded

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Message-ID: <20131122184458.GE11305@ghostprotocols.net>
Date:	Fri, 22 Nov 2013 15:44:58 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 3/8] perf symbol: Save vmlinux or kallsyms path loaded

Em Mon, Nov 18, 2013 at 01:32:46PM -0700, David Ahern escreveu:
> Save vmlinux or kallsyms path loaded using embedded default lookup (ie.,
> not a user specified path). Upcoming perf sched timehist command requires
> kernel symbols for properly computing idle times and prints a warning
> if the kernel symbols are not loaded.

What would happen if strdup failed here?

Why don't we undo anything done so far in this function and return an
error?

- Arnaldo
 
> Signed-off-by: David Ahern <dsahern@...il.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> ---
>  tools/perf/util/symbol.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index f55c18da1e40..915eb6c4a248 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1437,6 +1437,8 @@ int dso__load_vmlinux(struct dso *dso, struct map *map,
>  			dso->data_type = DSO_BINARY_TYPE__VMLINUX;
>  		dso__set_long_name(dso, (char *)vmlinux);
>  		dso__set_loaded(dso, map->type);
> +		if (symbol_conf.vmlinux_name == NULL)
> +			symbol_conf.vmlinux_name = strdup(symfs_vmlinux);
>  		pr_debug("Using %s for symbols\n", symfs_vmlinux);
>  	}
>  
> @@ -1629,8 +1631,11 @@ static int dso__load_kernel_sym(struct dso *dso, struct map *map,
>  
>  do_kallsyms:
>  	err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
> -	if (err > 0)
> +	if (err > 0) {
> +		if (symbol_conf.kallsyms_name == NULL)
> +			symbol_conf.kallsyms_name = strdup(kallsyms_filename);
>  		pr_debug("Using %s for symbols\n", kallsyms_filename);
> +	}
>  	free(kallsyms_allocated_filename);
>  
>  	if (err > 0 && !dso__is_kcore(dso)) {
> -- 
> 1.8.3.4 (Apple Git-47)
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