[PATCH v2 0/2] Enable -Wincompatible-function-pointer-types-strict under W=1

Nathan Chancellor
2023-12-06T16:49:56Z

-Wincompatible-function-pointer-types-strict is a warning in clang-16
and newer that is designed to catch potential kCFI failures at runtime.
There is one set of warnings in drivers/counter that I have not been
able to figure out a solution for so this cannot be enabled for a
default build but adding the warning under W=1 will allow various CI
systems to catch and report new instances so it will be easier to
enable in a default build in the future.

The kbuild test robot reported one instance in arch/um, which is cleared
up by the first patch and has an ack from an arch/um maintainer, so this
should be able to go in via the kbuild tree.

---
Changes in v2:
- Rebase on latest kbuild tree.
- Pick up Nick's reviewed-by tag.
- Include arch/um patch with Anton's ack to clear up warning reported by
kbuild test robot on v1.
- Link to v1: https://lore.kernel.org/r/20231002-enable-wincompatible-function-pointer-types-strict-w-1-v1-1-808ab955d42d@kernel.org

---
Nathan Chancellor (2):
um: net: Fix return type of uml_net_start_xmit()
kbuild: Enable -Wincompatible-function-pointer-types-strict in W=1

arch/um/drivers/net_kern.c | 2 +-
scripts/Makefile.extrawarn | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
---
base-commit: 4b391dcb7cda8d1353d3bd123d0989550d48c0c9
change-id: 20231002-enable-wincompatible-function-pointer-types-strict-w-1-4a56b99b8c6f

Best regards,
--
Nathan Chancellor <nathan@kernel.org>