linux-hardening - Re: [PATCH v2 1/2] sh: Added kernel.h to word-at-a-time

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Date: Fri, 15 Dec 2023 21:09:05 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Tanzir Hasan <tanzirh@...gle.com>
Cc: Andy Shevchenko <andy@...nel.org>, Kees Cook <keescook@...omium.org>, 
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Nick DeSaulniers <nnn@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, llvm@...ts.linux.dev, 
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2 1/2] sh: Added kernel.h to word-at-a-time

On Fri, Dec 15, 2023 at 8:31 PM Tanzir Hasan <tanzirh@...gle.com> wrote:
> On Fri, Dec 15, 2023 at 8:04 AM Andy Shevchenko <andy@...nel.org> wrote:
>> On Thu, Dec 14, 2023 at 09:06:12PM +0000, tanzirh@...gle.com wrote:

...

>> > +#include <linux/kernel.h>
>>
>> I highly discourage from doing that. Instead, split what is needed to
>> the separate (new) header and include that one.
>
>
> I think it would make the most sense to do this in a separate patch.
> What word-at-a-time.h needs from kernel.h is REPEAT_BYTE and to my knowledge,
> almost every other version of word-at-a-time.h includes kernel.h gets this by
> including kernel.h. A future change could be removing REPEAT_BYTE
> out of kernel.h

Just create a patch that either moves that macro (along with upper_*()
and lower_*() APIs) to a more distinguishable header
(maybe bytes.h or words.h or wordpart.h, etc) and use it in your case
and fix others.

-- 
With Best Regards,
Andy Shevchenko