Re: [PATCH 2/2] perf tools: Fix find_perf_probe_point_from_map() which incorrectly returns success

From: acme@xxxxxxxxxx
Date: Thu Nov 05 2015 - 11:02:43 EST

Em Thu, Nov 05, 2015 at 02:08:48PM +0000, åæéå / HIRAMATUïMASAMI escreveu:
> From: Wang Nan [mailto:wangnan0@xxxxxxxxxx]
> >
> >It is possible that find_perf_probe_point_from_map() fails to find
> >symbol but still returns 0 because of an small error when coding:
> >find_perf_probe_point_from_map() set 'ret' to error code at first,
> >but also use it to hold return value of
> >kernel_get_symbol_address_by_name().
> OK, I didn't expect that there is a symbol which can be found by
> kernel_get_symbol_address_by_name() but not by __find_kernel_function()...

> Would you have any example of the error?
> >
> >This patch resets 'ret' to error even kernel_get_symbol_address_by_name()
> >success, so if !sym, the whole function returns error correctly.
> Hmm, that sounds tricky. I'd rather like to add *psym to kernel_get_symbol_address_by_name()
> to save symbol and don't use __find_kernel_function() instead.

Tricky? I don't think so, suboptimal? possibly, but it fixes an error,
so should be processed quickly, right? I'm applying his patch and then
whatever improvement can be done on top.

- Arnaldo
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