linux-kernel - Re: [PATCH 1/2] iov_iter: iterate_folioq: fix handling of offset >= folio size

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Message-ID: <f389ac0d-de77-4443-9302-3d8895e39daf@paulmck-laptop>
Date: Wed, 13 Aug 2025 16:04:19 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: Dominique Martinet <asmadeus@...ewreck.org>,
	Nathan Chancellor <nathan@...nel.org>,
	kernel test robot <lkp@...el.com>,
	Dominique Martinet via B4 Relay <devnull+asmadeus.codewreck.org@...nel.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Christian Brauner <brauner@...nel.org>,
	David Howells <dhowells@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>, llvm@...ts.linux.dev,
	oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	Maximilian Bosch <maximilian@...sch.me>,
	Ryan Lahfa <ryan@...fa.xyz>, Christian Theune <ct@...ingcircus.io>,
	Arnout Engelen <arnout@...t.net>, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH 1/2] iov_iter: iterate_folioq: fix handling of offset >=
 folio size

On Wed, Aug 13, 2025 at 03:39:09PM +0200, Andy Shevchenko wrote:
> On Wed, Aug 13, 2025 at 02:34:25PM +0900, Dominique Martinet wrote:
> > Nathan Chancellor wrote on Tue, Aug 12, 2025 at 10:16:33PM -0700:
> > > >    1 warning generated.
> > > 
> > > I see this in -next now, should remain be zero initialized or is there
> > > some other fix that is needed?
> > 
> > A zero-initialization is fine, I sent a v2 with zero-initialization
> > fixed yesterday:
> > https://lkml.kernel.org/r/20250812-iot_iter_folio-v2-1-f99423309478@codewreck.org
> > 
> > (and I'll send a v3 with the goto replaced with a bigger if later today
> > as per David's request)
> > 
> > I assume Andrew will pick it up eventually?
> 
> I hope this to happen sooner as it broke my builds too (I always do now `make W=1`
> and suggest all developers should follow).

This build failure is showing up in my testing as well.

In the service of preventing bisection issues, would it be possible to
fold the fix into the original patch?

							Thanx, Paul