linux-kernel - Re: [PATCH v5 2/9] tty: serial: amba: Use linux/{bits,bitfield}.h macros

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Date:   Thu, 07 Dec 2023 10:32:53 +0100
From:   Théo Lebrun <theo.lebrun@...tlin.com>
To:     "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc:     "Russell King" <linux@...linux.org.uk>,
        "Jiri Slaby" <jirislaby@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        Grégory Clement <gregory.clement@...tlin.com>,
        "Alexandre Belloni" <alexandre.belloni@...tlin.com>,
        "Thomas Petazzoni" <thomas.petazzoni@...tlin.com>,
        "Vladimir Kondratiev" <vladimir.kondratiev@...ileye.com>,
        "Tawfik Bayouk" <tawfik.bayouk@...ileye.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH v5 2/9] tty: serial: amba: Use linux/{bits,bitfield}.h
 macros

Hello,

On Thu Dec 7, 2023 at 2:37 AM CET, Greg Kroah-Hartman wrote:
> On Thu, Nov 30, 2023 at 03:07:14PM +0100, Théo Lebrun wrote:
> > The driver uses bit shifts and hexadecimal expressions to declare
> > constants. Replace that with the BIT(), GENMASK() & FIELD_PREP_CONST()
> > macros to clarify intent.
> > 
> > Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> > Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> > Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> > ---
> >  include/linux/amba/serial.h | 248 +++++++++++++++++++++++---------------------
> >  1 file changed, 127 insertions(+), 121 deletions(-)
>
> As 0-day had a problem with this patch, I've applied only patch 1 of
> this series.  Can you fix it up and rebase and resend the rest again
> (while adding the collected reviewed-by that some patches in this series
> had)?

So the issue is this: the header file gets included in
arch/arm/include/debug/pl01x.S that gets included in arch/arm/kernel/debug.S
(see #include CONFIG_DEBUG_LL_INCLUDE).

I don't see any easy way out of this, so I guess it means the patch must be
dropped. If someone confirms that there are indeed no solution to have BIT(),
GENMASK() & FIELD_PREP_CONST() accessible from assembly, I'll send the next
version.

Thanks,

--
Théo Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com