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Date:   Thu, 9 Sep 2021 18:52:27 -0700
From:   Kees Cook <>
To:     Andrew Morton <>
Cc:     kernel test robot <>,
        Matt Porter <>,
        Alexandre Bounine <>,
        Jing Xiangfeng <>,
        Ira Weiny <>,
        John Hubbard <>,
        Souptick Joarder <>,
        "Gustavo A . R . Silva" <>,
        Dan Carpenter <>,,
Subject: Re: [PATCH] rapidio: Avoid bogus __alloc_size warning

On Thu, Sep 09, 2021 at 04:11:09PM -0700, Andrew Morton wrote:
> On Thu, 9 Sep 2021 15:51:23 -0700 Kees Cook <> 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.

Er, it's in the Subject, but I guess I could repeat it?

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

It's in -next via -mm, and all is well as far as I know:


FWIW, I had extensively checked (and fixed) warnings from it before sending it
your way. This patch is fixing an error that just appeared from


Kees Cook

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