linux-kernel - Re: [PATCH V2] perf tools: Fix maps__find_symbol_by

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Date:   Fri, 7 Sep 2018 11:58:42 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] perf tools: Fix maps__find_symbol_by_name()

On Fri, Sep 07, 2018 at 11:51:16AM +0300, Adrian Hunter wrote:
> Commit 1c5aae7710bb ("perf machine: Create maps for x86 PTI entry
> trampolines") revealed a problem with maps__find_symbol_by_name() that
> resulted in probes not being found e.g.
> 
> 	$ sudo perf probe xsk_mmap
> 	xsk_mmap is out of .text, skip it.
> 	Probe point 'xsk_mmap' not found.
> 	   Error: Failed to add events.
> 
> maps__find_symbol_by_name() can optionally return the map of the found
> symbol. It can get the map wrong because, in fact, the symbol is found
> on the map's dso, not allowing for the possibility that the dso has more
> than one map. Fix by always checking the map contains the symbol.
> 
> Reported-by: Björn Töpel <bjorn.topel@...el.com>
> Tested-by: Björn Töpel <bjorn.topel@...el.com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka