]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
hugetlb: take PMD sharing into account when flushing tlb/caches
authorMike Kravetz <mike.kravetz@oracle.com>
Fri, 5 Oct 2018 22:51:33 +0000 (15:51 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 5 Oct 2018 23:32:04 +0000 (16:32 -0700)
commitdff11abe280b47c21b804a8ace318e0638bb9a49
treedb5156b3f8602967aba6949c3ef389afd0055ac2
parent017b1660df89f5fb4bfe66c34e35f7d2031100c7
hugetlb: take PMD sharing into account when flushing tlb/caches

When fixing an issue with PMD sharing and migration, it was discovered via
code inspection that other callers of huge_pmd_unshare potentially have an
issue with cache and tlb flushing.

Use the routine adjust_range_if_pmd_sharing_possible() to calculate worst
case ranges for mmu notifiers.  Ensure that this range is flushed if
huge_pmd_unshare succeeds and unmaps a PUD_SUZE area.

Link: http://lkml.kernel.org/r/20180823205917.16297-3-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mm/hugetlb.c