linux-kernel - Re: [PATCH 06/11] cgroup: fix -Wzero-length-bounds warnings

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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,
        tboot-devel@...ts.sourceforge.net, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, ath11k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org, cgroups@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Roman Gushchin <guro@...com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Alexei Starovoitov <ast@...nel.org>,
        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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