On 10.08.22 23:44, Andrew Morton wrote: > > The patch titled > Subject: mm: re-allow pinning of zero pfns (again) > has been added to the -mm mm-hotfixes-unstable branch. Its filename is > mm-re-allow-pinning-of-zero-pfns-again.patch > > This patch will shortly appear at > https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-re-allow-pinning-of-zero-pfns-again.patch > > This patch will later appear in the mm-hotfixes-unstable branch at > git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > > Before you just go and hit "reply", please: > a) Consider who else should be cc'ed > b) Prefer to cc a suitable mailing list as well > c) Ideally: find the original patch on the mailing list and do a > reply-to-all to that, adding suitable additional cc's > > *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** > > The -mm tree is included into linux-next via the mm-everything > branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > and is updated there every 2-3 working days > > ------------------------------------------------------ > From: Alex Williamson <alex.williamson@xxxxxxxxxx> > Subject: mm: re-allow pinning of zero pfns (again) > Date: Wed, 10 Aug 2022 10:53:59 -0600 > > The below referenced commit makes the same error as 1c563432588d ("mm: fix > is_pinnable_page against a cma page"), re-interpreting the logic to > exclude pinning of the zero page, which breaks device assignment with > vfio. > > To avoid further subtle mistakes, split the logic into discrete tests. > > Link: https://lkml.kernel.org/r/166015037385.760108.16881097713975517242.stgit@omen > Link: https://lore.kernel.org/all/165490039431.944052.12458624139225785964.stgit@omen > Fixes: f25cbb7a95a2 ("mm: add zone device coherent type memory support") > Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx> > Suggested-by: Matthew Wilcox <willy@xxxxxxxxxxxxx> > Suggested-by: Felix Kuehling <felix.kuehling@xxxxxxx> > Cc: Alex Sierra <alex.sierra@xxxxxxx> > Cc: Christoph Hellwig <hch@xxxxxx> > Cc: Alistair Popple <apopple@xxxxxxxxxx> > Cc: David Hildenbrand <david@xxxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> -- Thanks, David / dhildenb
