]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/commit
mm/thp: another PVMW_SYNC fix in page_vma_mapped_walk()
authorHugh Dickins <hughd@google.com>
Fri, 25 Jun 2021 01:39:30 +0000 (18:39 -0700)
committerStefan Bader <stefan.bader@canonical.com>
Fri, 13 Aug 2021 07:44:30 +0000 (09:44 +0200)
commit04a10d42293674c2e087d6a75c53a8f3f4d98816
tree1c0b48fca44874f12d82bd348371ae826fdb772d
parentd5669b626858b0385e8dd5cad792392da82f89ab
mm/thp: another PVMW_SYNC fix in page_vma_mapped_walk()

BugLink: https://bugs.launchpad.net/bugs/1936242
Aha! Shouldn't that quick scan over pte_none()s make sure that it holds
ptlock in the PVMW_SYNC case? That too might have been responsible for
BUGs or WARNs in split_huge_page_to_list() or its unmap_page(), though
I've never seen any.

Link: https://lkml.kernel.org/r/1bdf384c-8137-a149-2a1e-475a4791c3c@google.com
Link: https://lore.kernel.org/linux-mm/20210412180659.B9E3.409509F4@e16-tech.com/
Fixes: ace71a19cec5 ("mm: introduce page_vma_mapped_walk()")
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Wang Yugui <wangyugui@e16-tech.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
mm/page_vma_mapped.c