linux-kernel - Re: [PATCH v2 1/2] mm/memory_hotplug: simplify calculation of number of pages in __remove

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Message-ID: <CAHk-=wjQCPE1nh8ZoQZzXV8taV9nttsBp=4FQG8OL=L5fuWZXw@mail.gmail.com>
Date:   Mon, 30 Mar 2020 15:27:42 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Segher Boessenkool <segher@...nel.crashing.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...nel.org>, Baoquan He <bhe@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Wei Yang <richardw.yang@...ux.intel.com>
Subject: Re: [PATCH v2 1/2] mm/memory_hotplug: simplify calculation of number
 of pages in __remove_pages()

On Mon, Mar 30, 2020 at 3:14 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> My nightly check-all-the-patches-for-various-cruft script emails me
> about =3D but I didn't' have a test for "o=$m".  I just added one.

=3D may be the common one, but =20 and =09 are others that end up
showing up when whitespace gets quoted for various reasons.

Another one is =46 for 'F'. Why? Because some mailers think that
"From" at the beginning of a line is the mbox beginning marker, and
they'll escape any line that begins with "From" to use "=46rom"
instead.

Those mailers are wrong (at a _minimum_ it's "From " with a space, and
you generally should be even stricter than that), but it happens.

And obviously, if there is real 8-bit stuff, you'll get all the real
odd hex noise.

               Linus