Re: [PATCH v3 4/4] amdgpu/dc/calcs: Support clang option for stack alignment

[Matthias Kaehlcke <mka@chromium.org>]

El Thu, Feb 08, 2018 at 04:44:21PM -0500 Harry Wentland ha dit:

> On 2018-02-08 04:03 PM, Harry Wentland wrote:
> > On 2018-02-08 03:53 PM, Matthias Kaehlcke wrote:
> >> calcs uses the compiler option -mpreferred-stack-boundary=4 to configure
> >> a stack alignment of 16 bytes. Clang uses the option -mstack-alignment
> >> instead, which expects as parameter the alignment in bytes, and not a
> >> power of two like -mpreferred-stack-boundary.
> >>
> >> Probe for both compiler options and use the correct one, similar to
> >> what is done in arch/x86/Makefile.
> >>
> >> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
> > 
> > Series is
> > Reviewed-by: Harry Wentland <harry.wentland@amd.com>
> 
> ... and merged to amd-staging-drm-next.

Thanks!

> I had to resolve a small conflict with patches 1 & 2. Not a big deal but curious what development branch you use. We normally use this for amd-gfx development: https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next (although it might be a bit behind our internal dev tree).

I typically use Linus' tree as base, will try to remember to check
future patches against amd-staging-drm-next.

> >> ---
> >> Changes in v3:
> >> - patch added
> >>
> >> Note to self: if this patterns proliferates further we probably want to
> >> put the evaluation of the correct compiler flag in some common place.
> >>
> >>  drivers/gpu/drm/amd/display/dc/calcs/Makefile | 8 +++++++-
> >>  1 file changed, 7 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/amd/display/dc/calcs/Makefile b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
> >> index af0f452f3c9f..95f332ee3e7e 100644
> >> --- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile
> >> +++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
> >> @@ -24,7 +24,13 @@
> >>  # It calculates Bandwidth and Watermarks values for HW programming
> >>  #
> >>  
> >> -calcs_ccflags := -mhard-float -msse -mpreferred-stack-boundary=4
> >> +ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
> >> +	cc_stack_align := -mpreferred-stack-boundary=4
> >> +else ifneq ($(call cc-option, -mstack-alignment=16),)
> >> +	cc_stack_align := -mstack-alignment=16
> >> +endif
> >> +
> >> +calcs_ccflags := -mhard-float -msse $(cc_stack_align)
> >>  
> >>  CFLAGS_dcn_calcs.o := $(calcs_ccflags)
> >>  CFLAGS_dcn_calc_auto.o := $(calcs_ccflags)
> >>
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