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

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Message-Id: <cdf339b3-f3a4-4ed3-9d40-8125b50c0991@app.fastmail.com>
Date: Mon, 26 May 2025 16:59:54 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Naresh Kamboju" <naresh.kamboju@...aro.org>,
 linux-stable <stable@...r.kernel.org>,
 "open list" <linux-kernel@...r.kernel.org>, linux-s390@...r.kernel.org,
 devel@...verdev.osuosl.org, lkft-triage@...ts.linaro.org
Cc: "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
 "Sasha Levin" <sashal@...nel.org>,
 "Anders Roxell" <anders.roxell@...aro.org>,
 "Dan Carpenter" <dan.carpenter@...aro.org>,
 "Heiko Carstens" <hca@...ux.ibm.com>, "Vasily Gorbik" <gor@...ux.ibm.com>,
 "Alexander Gordeev" <agordeev@...ux.ibm.com>
Subject: Re: stable-rc/queue/6.14: S390: devres.h:111:16: error: implicit declaration
 of function 'IOMEM_ERR_PTR' [-Werror=implicit-function-declaration]

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@...aro.org>
>
>
> 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