Re: [PATCH] perf probe: Fix getting the kernel map

[Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>]

Em Mon, Mar 04, 2019 at 03:13:21PM +0200, Adrian Hunter escreveu:
> Since commit 4d99e4136580 ("perf machine: Workaround missing maps for x86
> PTI entry trampolines"), perf tools has been creating more than one kernel
> map, however 'perf probe' assumed there could be only one.
> 
> Fix by using machine__kernel_map() to get the main kernel map.

Masami, can I get your Acked-by?

- Arnaldo
 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> Fixes: 4d99e4136580 ("perf machine: Workaround missing maps for x86 PTI entry trampolines")
> Fixes: d83212d5dd67 ("kallsyms, x86: Export addresses of PTI entry trampolines")
> Tested-by: Joseph Qi <joseph.qi@linux.alibaba.com>
> Cc: stable@vger.kernel.org
> ---
>  tools/perf/util/probe-event.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index e86f8be89157..6cd96f9b346d 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -157,8 +157,10 @@ static struct map *kernel_get_module_map(const char *module)
>  	if (module && strchr(module, '/'))
>  		return dso__new_map(module);
>  
> -	if (!module)
> -		module = "kernel";
> +	if (!module) {
> +		pos = machine__kernel_map(host_machine);
> +		return map__get(pos);
> +	}
>  
>  	for (pos = maps__first(maps); pos; pos = map__next(pos)) {
>  		/* short_name is "[module]" */
> -- 
> 2.19.1

-- 

- Arnaldo