Re: [PATCH v10 3/4] drm/panthor: Add tracepoint for hardware utilisation changes

[Nathan Chancellor <nathan@kernel.org>]

On Fri, Jan 23, 2026 at 01:52:19PM +0100, Nicolas Frattaroli wrote:
> On Friday, 23 January 2026 05:02:21 Central European Standard Time Sasha Levin wrote:
> > With this commit, I'm seeing:
> > 
> > In file included from drivers/gpu/drm/panthor/panthor_trace.h:86,
> >                   from drivers/gpu/drm/panthor/panthor_gpu.c:26:
> > ./include/trace/define_trace.h:118:42: fatal error: ./panthor_trace.h: No such file or directory
> >    118 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
> > 
> > I think we need to add in 'CFLAGS_panthor_gpu.o := -I$(src)' to the Makefile
> > too, but I haven't tested that yet.
> > 
> > 
> 
> Huh, puzzling that I never ran into this build failure.
> 
> Doing another build right now, I still can't reproduce it even on a clean
> build without ccache. Your fix looks appropriate though judging by the LWM[1]
> series on event tracepoints.
> 
> I'll submit a fix for this.

You will only see this when building in-tree (i.e., no O= or
KBUILD_OUTPUT) because $(src) and $(obj) are only added to the include
path automatically when building out of tree (see scripts/Makefile.lib,
search for 'ifdef building_out_of_srctree'), which could explain why you
(and presumably Mark doing -next) have not seen this error yet.

  $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux- O=build defconfig drivers/gpu/drm/panthor/panthor_gpu.o

  $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux- defconfig drivers/gpu/drm/panthor/panthor_gpu.o
  In file included from drivers/gpu/drm/panthor/panthor_trace.h:86,
                   from drivers/gpu/drm/panthor/panthor_gpu.c:26:
  ./include/trace/define_trace.h:118:42: fatal error: ./panthor_trace.h: No such file or directory
    118 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
        |                                          ^
  compilation terminated.

Cheers,
Nathan