[REGRESSION] stable-rc/linux-6.12.y: (build) incompatible pointer types passing 'u32 (*)[4]' (aka 'unsigned int...

[REGRESSION] stable-rc/linux-6.12.y: (build) incompatible pointer types passing 'u32 (*)[4]' (aka 'unsigned int...

[KernelCI bot]

Hello,

New build issue found on stable-rc/linux-6.12.y:

---
 incompatible pointer types passing 'u32 (*)[4]' (aka 'unsigned int (*)[4]') to parameter of type 'uuid_t *' [-Werror,-Wincompatible-pointer-types] in drivers/firmware/arm_ffa/driver.o (drivers/firmware/arm_ffa/driver.c) [logspec:kbuild,kbuild.compiler.error]
---

- dashboard: https://d.kernelci.org/i/maestro:5469b396123e4618aadb3c2d0ad4d1811095c956
- giturl: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
- commit HEAD:  97928cc88900a9fb07a4dddbd1db19eb0ce55c56


Please include the KernelCI tag when submitting a fix:

Reported-by: kernelci.org bot <bot@kernelci.org>


Log excerpt:
=====================================================
/tmp/kci/linux/drivers/firmware/arm_ffa/driver.c:381:14: error: incompatible pointer types passing 'u32 (*)[4]' (aka 'unsigned int (*)[4]') to parameter of type 'uuid_t *' [-Werror,-Wincompatible-pointer-types]
  381 |                         uuid_copy(&buf->uuid, &uuid_regs.uuid);
      |                                   ^~~~~~~~~~
/tmp/kci/linux/include/linux/uuid.h:76:38: note: passing argument to parameter 'dst' here
   76 | static inline void uuid_copy(uuid_t *dst, const uuid_t *src)
      |                                      ^
1 error generated.

=====================================================


# Builds where the incident occurred:

## defconfig+allmodconfig on (arm64):
- compiler: clang-21
- config: None
- dashboard: https://d.kernelci.org/build/maestro:6a189f30ee38c2a863e3d00f


#kernelci issue maestro:5469b396123e4618aadb3c2d0ad4d1811095c956

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Re: [REGRESSION] stable-rc/linux-6.12.y: (build) incompatible pointer types passing 'u32 (*)[4]' (aka 'unsigned int...

[Sasha Levin]

On Thu, May 28, 2026 at 11:59:04PM -0000, KernelCI bot wrote:
> /tmp/kci/linux/drivers/firmware/arm_ffa/driver.c:381:14: error: incompatible pointer types passing 'u32 (*)[4]' (aka 'unsigned int (*)[4]') to parameter of type 'uuid_t *' [-Werror,-Wincompatible-pointer-types]
>   381 |                         uuid_copy(&buf->uuid, &uuid_regs.uuid);

Thanks for the report. In 6.12 struct ffa_partition_info.uuid is still
'u32 uuid[4]', not uuid_t, so uuid_copy(&buf->uuid, ...) fails to
compile. The conversion prerequisite b7c9f32614f17 ("firmware: arm_ffa:
Replace UUID buffer to standard UUID format") isn't in 6.12. Dropped the
offending patch from the 6.12 queue along with its dependency:
  - "firmware: arm_ffa: fix big-endian support in __ffa_partition_info_get_regs"

--
Thanks,
Sasha