linux-kernel - Re: [PATCH] arm: Silence gcc warnings about arch ABI drift

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Date: Mon, 19 Feb 2024 02:03:16 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Calvin Owens <jcalvinowens@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>, Russell King <linux@...linux.org.uk>, 
	Dave Martin <Dave.Martin@....com>, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, 
	"linux-bcachefs@...r.kernel.org" <linux-bcachefs@...r.kernel.org>
Subject: Re: [PATCH] arm: Silence gcc warnings about arch ABI drift

On Sun, Feb 18, 2024 at 10:58:07PM -0800, Calvin Owens wrote:
> On Monday 02/19 at 07:21 +0100, Arnd Bergmann wrote:
> > On Mon, Feb 19, 2024, at 05:09, Calvin Owens wrote:
> > > 32-bit arm builds uniquely emit a lot of spam like this:
> > >
> > >     fs/bcachefs/backpointers.c: In function ‘extent_matches_bp’:
> > >     fs/bcachefs/backpointers.c:15:13: note: parameter passing for 
> > > argument of type ‘struct bch_backpointer’ changed in GCC 9.1
> > >
> > > Apply the arm64 change from commit ebcc5928c5d9 ("arm64: Silence gcc
> > > warnings about arch ABI drift") to silence them. It seems like Dave's
> > > original rationale applies here too.
> > >
> > > Cc: Dave Martin <Dave.Martin@....com>
> > > Signed-off-by: Calvin Owens <jcalvinowens@...il.com>
> > > ---
> >
> > I think these should be addressed in bcachefs instead.
> 
> That seems reasonable to me. For clarity, I just happened to notice this
> while doing allyesconfig cross builds for something entirely unrelated.
> 
> I'll take it up with them. It's not a big problem from my POV, the notes
> don't cause -Werror builds to fail or anything like that.

Considering we're not dynamic linking it's a non issue for us.