powerpc/xmon: Relax frame size for clang

[David Laight]

From: Linuxppc-dev [mailto:linuxppc-dev-bounces+david.laight=aculab.com at lists.ozlabs.org] On Behalf Of
> Michael Ellerman
> Subject: Re: powerpc/xmon: Relax frame size for clang
> 
> On Wed, 2018-10-31 at 01:09:34 UTC, Joel Stanley wrote:
> > When building with clang (8 trunk, 7.0 release) the frame size limit is
> > hit:
> >
> >  arch/powerpc/xmon/xmon.c:452:12: warning: stack frame size of 2576
> >  bytes in function 'xmon_core' [-Wframe-larger-than=]
> >
> > Some investigation by Naveen indicates this is due to clang saving the
> > addresses to printf format strings on the stack.
> >
> > While this issue is investigated, bump up the frame size limit for xmon
> > when building with clang.
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/252
> > Signed-off-by: Joel Stanley <joel at jms.id.au>

Would it be better to stop some of the functions being inlined?

Clearly clang shouldn't be using separate on-stack temporaries
for every printf() call.
That is indicative of a bigger problem.

	David

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