linux-kernel - Re: [GIT PULL] bcachefs

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Date:   Tue, 27 Jun 2023 04:19:33 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Kent Overstreet <kent.overstreet@...ux.dev>,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-bcachefs@...r.kernel.org,
        Christoph Hellwig <hch@....de>
Subject: Re: [GIT PULL] bcachefs

On Mon, Jun 26, 2023 at 08:59:44PM -0600, Jens Axboe wrote:
> On 6/26/23 8:33?PM, Kent Overstreet wrote:
> > On Mon, Jun 26, 2023 at 07:13:54PM -0600, Jens Axboe wrote:
> >> fs/bcachefs/alloc_background.c: In function ?bch2_check_alloc_info?:
> >> fs/bcachefs/alloc_background.c:1526:1: warning: the frame size of 2640 bytes is larger than 2048 bytes [-Wframe-larger-than=]
> >>  1526 | }
> >>       | ^
> >> fs/bcachefs/reflink.c: In function ?bch2_remap_range?:
> >> fs/bcachefs/reflink.c:388:1: warning: the frame size of 2352 bytes is larger than 2048 bytes [-Wframe-larger-than=]
> >>   388 | }
> >>       | ^
> > 
> > What version of gcc are you using? I'm not seeing either of those
> > warnings - I'm wondering if gcc recently got better about stack usage
> > when inlining.
> 
> Using:
> 
> gcc (Debian 13.1.0-6) 13.1.0
> 
> and it's on arm64, fwiw.

OOI what PAGE_SIZE do you have configured?  Sometimes fs data structures
are PAGE_SIZE dependent (haven't looked at this particular bcachefs data
structure).  We've also had weirdness with various gcc versions on some
architectures making different inlining decisions from x86.