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    s390/ftrace: provide working ftrace_return_address() · 7eed2e09
    Heiko Carstens 提交于
    The common code ftrace_return_address(n), which is just a wrapper for
    __builtin_return_address(n), will only work for n > 0 if CONFIG_FRAME_POINTER
    is set to 'y'. Otherwise it will return 0.
    Since on s390 we will never have that config option set to 'y'
    ftrace_return_address() won't work at all for n > 0.
    
    Luckily we always compile the kernel with -mkernel-backchain which
    in turn means that __builtin_return_address(n) will always work.
    
    So let ftrace_return_address(n) map to __builtin_return_address(n).
    Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
    Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
    7eed2e09
ftrace.h 1.4 KB