[PATCH V17 0/7] Rust Support for powerpc

Enable experimental rust support for ppc64le and ppc32be. The patch for
ppc32 has been provided by Link Mauve[1] and ppc64le support[2] has been
merged over it. ppc32 needs some toolchain fixes mentioned in the patch
`rust: Add PowerPC support` and the discussion for that is done here[1].

This has been tested on
- powernv9 hardware
- pseries P11 hardware
- pseries(9, 10) qemu
- powernv(9, 10) qemu
- rustdoc on x86 and powerpc64le
- rusttest on x86 and powerpc64le

We are actively working with our LLVM team to get the target for ppc,
ppc64 and ppc64le in the rust compiler.

[1] https://lore.kernel.org/all/[email protected]
[2] https://lore.kernel.org/all/[email protected]

Changelog:
V16 -> V17:
- Rebased to latest v7.2-rc2 

V15 -> V16:
- Rebased to latest v7.1-rc4
V15: https://lore.kernel.org/all/[email protected]/

V14 -> V15:
- Fix an issue with rustdoc build on ppc64le
V14: https://lore.kernel.org/all/[email protected]/

V13 -> V14:
- 2nd patch is rewritten (Christian)
- Fixed a small typo in rust/Makefile (Sashiko)
- Fixed commit message in Patch 4 (Sashiko)
V13: https://lore.kernel.org/all/[email protected]/

V12 -> V13:
- Added a patch for fixing build issue on ppc32 by Link Mauve
- Added another patch to fix a build issue in dma-buf
- Added another patch to enforce minimum `rustc` version for powerpc
V12: https://lore.kernel.org/all/[email protected]/

V11 -> V12:
- Rebased to mainline (rust/Makefile conflict resolved)
V11: https://lore.kernel.org/all/[email protected]/

V10 -> V11:
- Updated `rust/Makefile`
- Not all libraries are move to `rust/host` directory now. Only
  proc_macro2, quote and syn are moved
- Special handling for pin init is added. Details in commit
- Removed mkdir for `rust/host`, this is now handled by toolchain.
V10: https://lore.kernel.org/all/[email protected]/

V9 -> V10:
- rust/Makefile updated with review comments from Miguel
- Patch 1/4 updated with commit message and subject
V9: https://lore.kernel.org/all/[email protected]/

V8 -> V9:
- rust/Makefile updated with a directory instead of abspath
V8: https://lore.kernel.org/all/[email protected]/

V7 -> V8:
- rust/Makefile updated to separate host libraries from target
V7: https://lore.kernel.org/all/[email protected]/

Changelog:
V6 -> V7:
- Documentation removed as powerpc is still under development
- Added a fix for race condition in rust/Makefile
V6: https://lore.kernel.org/all/[email protected]

V5 -> V6:
- Added a missing Tested by from Venkat which got missed since V3
- Support is marked as Maintained instead of experimental
V5: https://lore.kernel.org/all/[email protected]

V4 -> V5:
- Removed a nested ifdef from PPC64 for Little endian toolchain
V4: https://lore.kernel.org/all/[email protected]

V3 -> V4:
- Co-developed-by header added in patch 1
V3: https://lore.kernel.org/all/[email protected]

V2 -> V3:
- Splited HAVE_RUST in 2 lines
- BINDGEN_TARGET_powerpc initialized before assigning the same to
  BINDGEN_TARGET
V2: https://lore.kernel.org/all/[email protected]

V1 -> V2:
- jump label fix for rust has been moved to a separate patch
- PPC32 support has been taken
- rust support has been marked experimental
- target.json dependency has been removed
- HAVE_RUST now depends on CPU_LITTLE_ENDIAN for PPC64
V1: https://lore.kernel.org/all/[email protected] 

Link Mauve (2):
  rust: Make __udivdi3() and __umoddi3() panic
  rust: Add PowerPC support

Mukesh Kumar Chaurasiya (IBM) (5):
  rust: Fix "multiple candidates for rmeta dependency core" error
  dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is
    disabled
  powerpc/jump_label: adjust inline asm to be consistent
  rust/powerpc: Set min rustc version for powerpc
  powerpc: Enable Rust for ppc64le

 arch/powerpc/Kconfig                  |  2 +
 arch/powerpc/Makefile                 |  7 ++++
 arch/powerpc/include/asm/jump_label.h | 23 ++++++-----
 rust/Makefile                         | 56 +++++++++++++++++----------
 rust/compiler_builtins.rs             |  6 +++
 rust/helpers/helpers.c                |  2 +
 scripts/min-tool-version.sh           |  2 +
 7 files changed, 68 insertions(+), 30 deletions(-)

-- 
2.55.0