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Date:   Thu, 9 Sep 2021 16:11:09 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Kees Cook <keescook@chromium.org>
Cc:     kernel test robot <lkp@intel.com>,
        Matt Porter <mporter@kernel.crashing.org>,
        Alexandre Bounine <alex.bou9@gmail.com>,
        Jing Xiangfeng <jingxiangfeng@huawei.com>,
        Ira Weiny <ira.weiny@intel.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Souptick Joarder <jrdr.linux@gmail.com>,
        "Gustavo A . R . Silva" <gustavoars@kernel.org>,
        Dan Carpenter <dan.carpenter@oracle.com>,
        linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Re: [PATCH] rapidio: Avoid bogus __alloc_size warning
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On Thu, 9 Sep 2021 15:51:23 -0700 Kees Cook <keescook@chromium.org> wrote:

> > That's an "error", not a warning.  Or is this thanks to the new -Werror?
> 
> This is a "regular" error (__bad_copy_to() uses __compiletime_error()).
> 
> > Either way, I'm inclined to cc:stable on this, because use of gcc-9 on
> > older kernels will be a common thing down the ages.
> > 
> > If it's really an "error" on non-Werror kernels then definitely cc:stable.
> 
> I would expect that as only being needed if __alloc_size was backported
> to -stable, which seems unlikely.

Ah.  Changelog didn't tell me that it's an __alloc_size thing.

What's the status of the __alloc_size() patchset, btw?