linux-kernel - Re: [PATCH] i3c/master/mipi-i3c-hci: re-fix __maybe

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Date:   Wed, 30 Dec 2020 23:00:38 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Nicolas Pitre <npitre@...libre.com>,
        Arnd Bergmann <arnd@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Arnd Bergmann <arnd@...db.de>, linux-i3c@...ts.infradead.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] i3c/master/mipi-i3c-hci: re-fix __maybe_unused attribute

On 30/12/2020 14:43:21-0700, Nathan Chancellor wrote:
> On Wed, Dec 30, 2020 at 10:40:53PM +0100, Alexandre Belloni wrote:
> > On 30/12/2020 16:23:56-0500, Nicolas Pitre wrote:
> > > On Wed, 30 Dec 2020, Arnd Bergmann wrote:
> > > 
> > > > From: Arnd Bergmann <arnd@...db.de>
> > > > 
> > > > clang warns because the added __maybe_unused attribute is in
> > > > the wrong place:
> > > > 
> > > > drivers/i3c/master/mipi-i3c-hci/core.c:780:21: error: attribute declaration must precede definition [-Werror,-Wignored-attributes]
> > > > static const struct __maybe_unused of_device_id i3c_hci_of_match[] = {
> > > >                     ^
> > > > include/linux/compiler_attributes.h:267:56: note: expanded
> > > > 
> > > > Fixes: 95393f3e07ab ("i3c/master/mipi-i3c-hci: quiet maybe-unused variable warning")
> > > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > > 
> > > Acked-by: Nicolas Pitre <npitre@...libre.com>
> > > 
> > > This might be the 3rd patch from 3 different people fixing the same 
> > > thing. Looks like I3C maintainer is on vacation. Please feel free to 
> > > send this trivial fix upstream some other way.
> > > 
> > 
> > Isn't it already upstream?
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95393f3e07ab53855b91881692a4a5b52dcdc03c
> 
> This patch is fixing that one, the attribute was added between the
> struct type, causing a new warning for clang.
> 

Ah yes, even after reading that 3 times, I got it wrong.

> I sent a fix for this earlier too, I do not care which one goes in as
> long as one does so:
> 
> Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
> 

I was going to review and apply yours now that I have access to the i3c
repo. I must admit I didn't have a look at i3c patches until now and the
holiday season is not helping.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com