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Message-ID: <YGLkPjSBdgpriC0E@blackbook>
Date: Tue, 30 Mar 2021 10:41:34 +0200
From: Michal Koutný <mkoutny@...e.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: linux-kernel@...r.kernel.org, Martin Sebor <msebor@....gnu.org>,
Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
Johannes Weiner <hannes@...xchg.org>,
Arnd Bergmann <arnd@...db.de>, x86@...nel.org,
Ning Sun <ning.sun@...el.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Kalle Valo <kvalo@...eaurora.org>,
Simon Kelley <simon@...kelleys.org.uk>,
James Smart <james.smart@...adcom.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
Anders Larsen <al@...rsen.net>,
Serge Hallyn <serge@...lyn.com>,
Imre Deak <imre.deak@...el.com>,
linux-arm-kernel@...ts.infradead.org,
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Andrii Nakryiko <andriin@...com>, Odin Ugedal <odin@...d.al>,
Cong Wang <xiyou.wangcong@...il.com>,
Bhaskar Chowdhury <unixbhaskar@...il.com>
Subject: Re: [PATCH 06/11] cgroup: fix -Wzero-length-bounds warnings
On Mon, Mar 22, 2021 at 05:02:44PM +0100, Arnd Bergmann <arnd@...nel.org> wrote:
> I'm not sure what is expected to happen for such a configuration,
> presumably these functions are never calls in that case.
Yes, the functions you patched would only be called from subsystems or
there should be no way to obtain a struct cgroup_subsys reference
anyway (hence it's ok to always branch as if ss==NULL).
I'd prefer a variant that wouldn't compile the affected codepaths when
there are no subsystems registered, however, I couldn't come up with a
way how to do it without some preprocessor ugliness.
Reviewed-by: Michal Koutný <mkoutny@...e.com>
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