linux

iv/linux

History

Russell King b039372790 ARM: fix function graph tracer and unwinder dependencies

commit 503621628b32782a07b2318e4112bd4372aa3401 upstream.

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: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reported-by: Danilo Cezar Zanella <danilo.zanella@iag.usp.br>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-10-26 13:15:33 +02:00

alpha

tty: the rest, stop using tty_schedule_flip()

2022-07-29 17:05:47 +02:00

arc

ARC: entry: fix syscall_trace_exit argument

2022-04-27 13:14:11 +02:00

arm

ARM: fix function graph tracer and unwinder dependencies

2022-10-26 13:15:33 +02:00

arm64

arm64: map FDT as RW for early_init_dt_scan()