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Find a kernel function line

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Often in dmesg messages you have function names,for instance:

[   71.030609] msm_adsp_disable() 'AUDPREPROCTASK'

In order to get the line number and source file path do:

# grep msm_adsp_disable 
c029ff0c t msm_adsp_disable_locked
c029ff68 T msm_adsp_disable
c047fe98 r __ksymtab_msm_adsp_disable
c049030e r __kstrtab_msm_adsp_disable

notice the c029ff68,we will use it with addr2line:

# arm-none-linux-gnueabi-addr2line -f -e vmlinux c029ff68