On Mon, Sep 26, 2016 at 01:46:51AM +0200, Arnd Bergmann wrote:
> 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.
Thanks, that's better, but the warning still triggers on
kernel/sched/core.c for me, as the last patch only disables it for the
tracing directory.
But it's a few less warning messages, now on to fix up the rest...
thanks,
greg k-h
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