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

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Date: Sun, 18 Feb 2024 23:36:08 -0800
From: Calvin Owens <jcalvinowens@...il.com>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: 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 Monday 02/19 at 02:03 -0500, Kent Overstreet wrote:
> 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.

[ dropping arm people/lists ]

Would you mind taking this then?

Thanks,
Calvin

---8<---
From: Calvin Owens <jcalvinowens@...il.com>
Subject: [PATCH] bcachefs: Silence gcc warnings about arm arch ABI drift

32-bit arm builds 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 change from commit ebcc5928c5d9 ("arm64: Silence gcc warnings
about arch ABI drift") to fs/bcachefs/ to silence them.

Signed-off-by: Calvin Owens <jcalvinowens@...il.com>
---
 fs/bcachefs/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/bcachefs/Makefile b/fs/bcachefs/Makefile
index 1a05cecda7cc..3433959d4f35 100644
--- a/fs/bcachefs/Makefile
+++ b/fs/bcachefs/Makefile
@@ -90,3 +90,6 @@ bcachefs-y		:=	\
 	xattr.o
 
 obj-$(CONFIG_MEAN_AND_VARIANCE_UNIT_TEST)   += mean_and_variance_test.o
+
+# Silence "note: xyz changed in GCC X.X" messages
+subdir-ccflags-y += $(call cc-disable-warning, psabi)
-- 
2.43.0