[BUG] arm: perf probe can not get __copy_to_user callchain symbol

[Jovi Zhang]

Hi

In ARM, It seems that we cannot get __copy_to_user callchain symbol,
like below output,

I guess it due to function __copy_to_user don't compile with unwind
info, is this right?(not sure)

If the problem is relate with unwind info, is there anybody can make a
patch on this? I'm not familiar with unwind stuff very much.
thanks very much.


#perf record -e probe:__copy_to_user* -g -a ls

# Events: 677  probe:__copy_to_user
#
# Overhead  Command      Shared Object          Symbol
# ........  .......  .................  ..............
#
    93.50%     perf  [kernel.kallsyms]  [k] __copy_to_user
               |
               --- __copy_to_user
                  |
                  |--29.38%-- 0xffffffff
                  |          0xc0b00604
                  |
                  |--21.80%-- (nil)
                  |          |
                  |          |--92.03%-- 0xc0b00604
                  |          |
                  |          |--5.07%-- 0xc0af1bcc
                  |          |
                  |          |--1.45%-- 0xc0ab83b4
                  |          |
                  |          |--0.72%-- 0xc0af5a20
                  |          |
                  |           --0.72%-- 0xc0b0c8b0
                  |
                  |--19.91%-- 0xc0b0c8b0
                  |
                  |--19.91%-- 0xc0af5a20
                  |
                  |--8.53%-- 0xc0b0c658
                   --0.47%-- [...]
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