Messages in this thread | | | From | 平松雅巳 / HIRAMATU,MASAMI <> | Subject | RE: [PATCH 2/2] perf tools: Fix find_perf_probe_point_from_map() which incorrectly returns success | Date | Fri, 6 Nov 2015 06:28:58 +0000 |
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From: acme@kernel.org [mailto:acme@kernel.org] > >Em Thu, Nov 05, 2015 at 02:08:48PM +0000, 平松雅巳 / HIRAMATU,MASAMI escreveu: >> From: Wang Nan [mailto:wangnan0@huawei.com] >> > >> >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.
OK, then I'll send an improvement patch.
Thanks,
> >- Arnaldo
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