Re: stable-rc/queue/6.14: S390: devres.h:111:16: error: implicit declaration of function 'IOMEM_ERR_PTR' [-Werror=implicit-function-declaration]

[Arnd Bergmann]

On Mon, May 26, 2025, at 16:49, Naresh Kamboju wrote:
> Regressions on S390 tinyconfig builds failing with gcc-13, gcc-8 and
> clang-20 and clang-nightly tool chains on the stable-rc/queue/6.14.
>
> Regression Analysis:
>  - New regression? Yes
>  - Reproducible? Yes
>
> Build regression: S390 tinyconfig devres.h 'devm_ioremap_resource'
> implicit declaration of function 'IOMEM_ERR_PTR'
>
> Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
>
>
> Build log:
> ---------
> In file included from include/linux/device.h:31,
>                  from include/linux/node.h:18,
>                  from include/linux/cpu.h:17,
>                  from arch/s390/kernel/traps.c:28:
> include/linux/device/devres.h: In function 'devm_ioremap_resource':
> include/linux/device/devres.h:111:16: error: implicit declaration of
> function 'IOMEM_ERR_PTR' [-Werror=implicit-function-declaration]
>   111 |         return IOMEM_ERR_PTR(-EINVAL);
>       |                ^~~~~~~~~~~~~

The backport of 
a21cad931276 ("driver core: Split devres APIs to device/devres.h")
also needs a backport of
18311a766c58 ("err.h: move IOMEM_ERR_PTR() to err.h")

      Arnd