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authorSteven Price <steven.price@arm.com>2020-05-13 18:37:49 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2020-09-04 14:46:07 +0300
commit8a84802e2a2b1a682761a31c2685506b9f4e1840 (patch)
treef1833efdf37bde1c4281f9864c38d2f53810a2c3 /mm/shmem.c
parentd563d678aa0be06e7bff2953c986f5ff0355f79c (diff)
downloadlinux-8a84802e2a2b1a682761a31c2685506b9f4e1840.tar.xz
mm: Add arch hooks for saving/restoring tags
Arm's Memory Tagging Extension (MTE) adds some metadata (tags) to every physical page, when swapping pages out to disk it is necessary to save these tags, and later restore them when reading the pages back. Add some hooks along with dummy implementations to enable the arch code to handle this. Three new hooks are added to the swap code: * arch_prepare_to_swap() and * arch_swap_invalidate_page() / arch_swap_invalidate_area(). One new hook is added to shmem: * arch_swap_restore() Signed-off-by: Steven Price <steven.price@arm.com> [catalin.marinas@arm.com: add unlock_page() on the error path] [catalin.marinas@arm.com: dropped the _tags suffix] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index ec94f4c7851e..e57d3314dc4b 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1734,6 +1734,12 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
}
wait_on_page_writeback(page);
+ /*
+ * Some architectures may have to restore extra metadata to the
+ * physical page after reading from swap.
+ */
+ arch_swap_restore(swap, page);
+
if (shmem_should_replace_page(page, gfp)) {
error = shmem_replace_page(&page, gfp, info, index);
if (error)