• Russell King's avatar
    ARM: fix function graph tracer and unwinder dependencies · 50362162
    Russell King authored
    Naresh Kamboju recently reported that the function-graph tracer crashes
    on ARM. The function-graph tracer assumes that the kernel is built with
    frame pointers.
    
    We explicitly disabled the function-graph tracer when building Thumb2,
    since the Thumb2 ABI doesn't have frame pointers.
    
    We recently changed the way the unwinder method was selected, which
    seems to have made it more likely that we can end up with the function-
    graph tracer enabled but without the kernel built with frame pointers.
    
    Fix up the function graph tracer dependencies so the option is not
    available when we have no possibility of having frame pointers, and
    adjust the dependencies on the unwinder option to hide the non-frame
    pointer unwinder options if the function-graph tracer is enabled.
    Reviewed-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
    Tested-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
    Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
    50362162
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