Subject: Re: [PATCH] xfs: Fix 64-bit division on 32-bit in xlog_state_switch_iclogs()

From: "Darrick J. Wong" <[email-masked]>
Date: Thu, 10 Jun 2021 15:50:26 -0700

On Fri, Jun 11, 2021 at 08:01:55AM +1000, Dave Chinner wrote:
> On Thu, Jun 10, 2021 at 01:00:01PM +0200, Geert Uytterhoeven wrote:
> > On 32-bit (e.g. m68k):
> > 
> >     ERROR: modpost: "__udivdi3" [fs/xfs/xfs.ko] undefined!
> > 
> > Fix this by using a uint32_t intermediate, like before.
> > 
> > Reported-by: [email-masked]
> > Fixes: 7660a5b48fbef958 ("xfs: log stripe roundoff is a property of the log")
> > Signed-off-by: Geert Uytterhoeven <[email-masked]>
> > ---
> > Compile-tested only.
> > ---
> >  fs/xfs/xfs_log.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> <sigh>
> 
> 64 bit division on 32 bit platforms is still a problem in this day
> and age?
> 
> Reviewed-by: Dave Chinner <[email-masked]>
> 
> Maybe we should just put "requires 64 bit kernel" on XFS these days...

But then how will I recover my 100TB XFS using my TV?  It only has so
much framebuffer that I can abuse for swap memory...  >:O

Reviewed-by: Darrick J. Wong <[email-masked]>

--D

> -Dave.
> -- 
> Dave Chinner
> [email-masked]