Re: [PATCH v1 1/1] swap: Add exfat to filesystems requiring tst_fill_file

On Thu, Jun 18, 2026 at 12:04:27PM +0000, Andrea Cervesato wrote:
> Hi Jan,
>
> > Hi Andrea,
> >
> > just to add some context: the regression itself was on the kernel side.
> > The relevant upstream patch is
> > https://lore.kernel.org/all/20260603131950.321858-1-japo-tEXmvtCZX7AybS5Ee8rs3A@public.gmane.org/.
> > My understanding is that the kernel-side change did not resolve the issue
> > for the LTP test suite, and that there was also a separate LTP-relevant
> > aspect for exfat swapfiles, where actual data writes are required before
> > swapon() succeeds.
>
> Sorry, I forgot to properly reply to this email.
>
> Today I sent a patch to fix the kernel, you can take a look at it here:
> https://lore.kernel.org/all/20260618-exfat_swap_activate-v1-1-4c6a465df295-IBi9RG/[email protected]/
>
> This patch should fix the issue, let me know if you are still seeing a
> failure in the LTP tests after applying it.
>
> Thanks,
> --
> Andrea Cervesato
> SUSE QE Automation Engineer Linux
> andrea.cervesato-IBi9RG/[email protected]
Hi Andrea,

thanks, this fixes the swapping issue for me on s390.

There is just one remaining problem: when exfat is built as a module
(CONFIG_EXFAT_FS=m), the build fails because
generic_swapfile_activate() is not exported.

Please add EXPORT_SYMBOL_GPL(generic_swapfile_activate) in mm/page_io.c.

Best regards,
Jan

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