On Sunday 25 September 2016, Greg KH wrote:
>
> Hi Arnd,
>
> I'm getting the following build warnings on the 4.7-stable tree, any
> ideas what they are from:
>
> In file included from ../kernel/trace/trace_irqsoff.c:15:0:
> ../kernel/trace/trace_irqsoff.c: In function ‘stop_critical_timings’:
> ../include/linux/ftrace.h:703:36: warning: calling ‘__builtin_return_address’ with a nonzero argument is unsafe [-Wframe-address]
> # define ftrace_return_address(n) __builtin_return_address(n)
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> ../include/linux/ftrace.h:710:38: note: in expansion of macro ‘ftrace_return_address’
> #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1))
> ^~~~~~~~~~~~~~~~~~~~~
> ../kernel/trace/trace_irqsoff.c:433:38: note: in expansion of macro ‘CALLER_ADDR1’
> stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
> ^~~~~~~~~~~~
>
> It shows up in a few other places as well with this signature.
>
> Same goes for the 4.4-stable tree
In mainline, this warning got disabled with 124a3d88fa20 ("Disable "frame-address"
warning") and then later that change was partially reverted wtih 377ccbb48373
("Makefile: Mute warning for __builtin_return_address(>0) for tracing only").
It's probably fine if you apply both to the stable kernel.
I think I never saw this particular warning in my ARM build tests.
Arnd
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