linux-kernel - Re: clang-nightly: ERROR: modpost: "wcslen" [fs/smb/client/cifs.ko] undefined!

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Message-Id: <3ad96ab5-72a3-48ee-8ab3-e68d066169a4@app.fastmail.com>
Date: Wed, 02 Apr 2025 15:02:29 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Naresh Kamboju" <naresh.kamboju@...aro.org>,
 clang-built-linux <llvm@...ts.linux.dev>,
 "Linux ARM" <linux-arm-kernel@...ts.infradead.org>,
 linux-s390@...r.kernel.org, "open list" <linux-kernel@...r.kernel.org>,
 lkft-triage@...ts.linaro.org, samba-technical@...ts.samba.org,
 linux-cifs@...r.kernel.org, "Nathan Chancellor" <nathan@...nel.org>
Cc: "Steve French" <sfrench@...ba.org>, bharathsm@...rosoft.com,
 "Linus Torvalds" <torvalds@...ux-foundation.org>,
 "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
 "Dan Carpenter" <dan.carpenter@...aro.org>,
 "Anders Roxell" <anders.roxell@...aro.org>,
 "Shyam Prasad N" <sprasad@...rosoft.com>
Subject: Re: clang-nightly: ERROR: modpost: "wcslen" [fs/smb/client/cifs.ko] undefined!

On Wed, Apr 2, 2025, at 14:21, Naresh Kamboju wrote:
> Build regression: arm powerpc s390 modpost "wcslen" fs smb client
> cifs.ko undefined
>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>
> ## Build log
>
> ERROR: modpost: "wcslen" [fs/smb/client/cifs.ko] undefined!

This is from the latest clang release, and Nathan already sent a fix:

https://lore.kernel.org/lkml/20250328-string-add-wcslen-for-llvm-opt-v3-1-a180b4c0c1c4@kernel.org/

     Arnd