On Mon, Oct 09, 2023 at 10:39:09AM +0900, FUJITA Tomonori wrote:

This patchset adds Rust abstractions for phylib. It doesn't fully
cover the C APIs yet but I think that it's already useful. I implement
two PHY drivers (Asix AX88772A PHYs and Realtek Generic FE-GE). Seems
they work well with real hardware.

The first patch introduces Rust bindings for phylib.

The second patch updates the ETHERNET PHY LIBRARY entry in MAINTAINERS
file; adds the binding file and me as a maintainer of the Rust
bindings (as Andrew Lunn suggested).

The last patch introduces the Rust version of Asix PHY drivers,
drivers/net/phy/ax88796b.c. The features are equivalent to the C
version. You can choose C (by default) or Rust version on kernel
configuration.

I at last got around to installing a rust tool chain and tried to
build the code. I get what looks like linker errors.

linux$ make LLVM=1 rustavailable
Rust is available!

dpkg says:

+++-==============-============-============-=================================
ii  llvm           1:16.0-57    amd64        Low-Level Virtual Machine (LLVM)

I build with

make LLVM=1

and get lots of warnings like:

vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placeANtNtNtB4_5ascii10ascii_char9AsciiCharja_EB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placeFUPuENtNtNtB4_4task4wake8RawWakerEB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placeINtNtB4_6option6OptionINtNtNtNtB4_4iter8adapters7flatten7FlattenINtBJ_8IntoIterNtNtB4_4char11EscapeDebugEEEEB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placeNtNtB4_3fmt5ErrorEB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placesEB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f8classify+0x5a: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f16partial_classify+0x1f: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f13classify_bits+0x28: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f7next_up+0x32: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f9next_down+0x34: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f8midpoint+0xc3: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvNvMNtCs4KbNGwnAC5t_4core3f32f7to_bits13ct_f32_to_u32+0x4a: 'naked' return found in RETHUNK build

Any ideas?

    Andrew