• Uwe Kleine-König's avatar
    [ARM] 5613/1: implement CALLER_ADDRESSx · 4bf1fa5a
    Uwe Kleine-König authored
    From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
    
    As __builtin_return_address(n) doesn't work for ARM with n > 0, the
    kernel needs its own implementation.
    
    This fixes many warnings saying:
    
    	warning: unsupported argument to '__builtin_return_address'
    
    The new methods and walk_stackframe must not be instrumented because
    CALLER_ADDRESSx is used in the various tracers and tracing the tracer is
    a bad idea.
    
    What's currently missing is an implementation using unwind tables.  This
    is not fatal though, it's just that the tracers don't get enough
    information to be really useful.
    
    Note that if both ARM_UNWIND and FRAME_POINTER are enabled,
    walk_stackframe uses unwind information.  So in this case the same
    implementation is used as when FRAME_POINTER is disabled.
    
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    4bf1fa5a
Makefile 1.49 KB