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| author |   Ralph Campbell <rcampbell@nvidia.com> | 2020-01-30 22:14:44 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-01-31 10:30:39 -0800 |
| commit | 34290e2c6419d3a61391416b5ab6ceb37f857fde (patch) | |
| tree | ee0dd5a964a97796812e9e531b64950c34609e91 /mm/migrate.c | |
| parent | mm/migrate: clean up some minor coding style (diff) | |
| download | wireguard-linux-34290e2c6419d3a61391416b5ab6ceb37f857fde.tar.xz wireguard-linux-34290e2c6419d3a61391416b5ab6ceb37f857fde.zip | |
mm/migrate: add stable check in migrate_vma_insert_page()
migrate_vma_insert_page() closely follows the code in:
__handle_mm_fault()
handle_pte_fault()
do_anonymous_page()
Add a call to check_stable_address_space() after locking the page table
entry before inserting a ZONE_DEVICE private zero page mapping similar
to page faulting a new anonymous page.
Link: http://lkml.kernel.org/r/20200107211208.24595-4-rcampbell@nvidia.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Bharata B Rao <bharata@linux.ibm.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Chris Down <chris@chrisdown.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 0144e13c6b64..edf42ed90030 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -48,6 +48,7 @@ #include <linux/page_owner.h> #include <linux/sched/mm.h> #include <linux/ptrace.h> +#include <linux/oom.h> #include <asm/tlbflush.h> @@ -2695,6 +2696,14 @@ int migrate_vma_setup(struct migrate_vma *args) } EXPORT_SYMBOL(migrate_vma_setup); +/* + * This code closely matches the code in: + * __handle_mm_fault() + * handle_pte_fault() + * do_anonymous_page() + * to map in an anonymous zero page but the struct page will be a ZONE_DEVICE + * private page. + */ static void migrate_vma_insert_page(struct migrate_vma *migrate, unsigned long addr, struct page *page, @@ -2775,6 +2784,9 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate, ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl); + if (check_stable_address_space(mm)) + goto unlock_abort; + if (pte_present(*ptep)) { unsigned long pfn = pte_pfn(*ptep); |