linux-yocto/5.0: fix systemtap on arm

The following commit is part of 5.0.17+:

    ARM: fix function graph tracer and unwinder dependencies

    [ Upstream commit 503621628b32782a07b2318e4112bd4372aa3401 ]

    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: Sasha Levin <sashal@kernel.org>

As such, we no longer have UNWINDER_ARM enabled in our ARM builds by
default, since we do have FUNCTION_GRAPH_TRACER enabled in the common
ftrace configuration.

We disable FUNCTION_GRAPH_TRACER for ARM, which allows UNWINDER_ARM to
remain enabled and hence systemtap work out of the box for our ARM
reference builds. Obviously, BSPs or other users of the fragments can
make a different decision, but we chose unwinder to be on by default.

(From OE-Core rev: 8b8fb2e0d991c280317e28867224ed2080aa50c1)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions