linux-kernel - Re: sched_ext: build errors when building flatcg and qmap schedulers

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Message-ID: <ZvzXarv10LVGteNd@linux.ibm.com>
Date: Wed, 2 Oct 2024 10:47:53 +0530
From: Vishal Chourasia <vishalc@...ux.ibm.com>
To: Tejun Heo <tj@...nel.org>
Cc: David Vernet <void@...ifault.com>, Josh Don <joshdon@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Barret Rhoden <brho@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: sched_ext: build errors when building flatcg and qmap schedulers

On Tue, Oct 01, 2024 at 10:45:55AM -1000, Tejun Heo wrote:
> Hello, Vishal.
> 
> On Tue, Oct 01, 2024 at 05:08:58PM +0530, Vishal Chourasia wrote:
> > Getting build error when trying to compile example schedulers in
> > tools/sched_ext/* (logs shared in the end)
> > 
> > 
> > tools/sched_ext # make -s -k
> > 
> > 
> > git repo state
> > $ git log --oneline
> > e32cde8d2bd7d (HEAD -> master, origin/master, origin/HEAD) Merge tag 'sched_ext-for-6.12-rc1-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext
> > 190ecde722dd0 Merge tag 'probes-fixes-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
> > a5f24c795513f Merge tag 'vfs-6.12-rc2.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
> > f801850bc263d netfs: Fix the netfs_folio tracepoint to handle NULL mapping
> > 28e8c5c095ec2 netfs: Add folio_queue API documentation
> > 2007d28ec0095 bcachefs: rename version -> bversion for big endian builds
> > 34820304cc2cd uprobes: fix kernel info leak via "[uprobes]" vma
> > 9852d85ec9d49 (tag: v6.12-rc1) Linux 6.12-rc1
> > 
> > 
> > Adding __weak attribute seems to have fixed it and compilation completed
> > with no errors.
> 
> Hmm... I don't see the failure here. Maybe toolchain difference? Anyways,
$ clang --version
clang version 20.0.0git (https://github.com/llvm/llvm-project.git 00c198b2ca6b6bee2d90e62d78816686ab056b1b)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin

$ gcc --version
gcc (GCC) 14.2.1 20240912 (Red Hat 14.2.1-3)
Copyright (C) 2024 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Do let me know if you need any other information

> can you send the patch to add __weak?
Sure.
> 
> Thanks.
> 
> -- 
> tejun