summaryrefslogtreecommitdiff
path: root/mm/page_io.c
diff options
context:
space:
mode:
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/page_io.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/page_io.c')
-rw-r--r--mm/page_io.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/mm/page_io.c b/mm/page_io.c
index e485a6e8a6cd..4ca28aad0d94 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -252,6 +252,16 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
unlock_page(page);
goto out;
}
+ /*
+ * Arch code may have to preserve more data than just the page
+ * contents, e.g. memory tags.
+ */
+ ret = arch_prepare_to_swap(page);
+ if (ret) {
+ set_page_dirty(page);
+ unlock_page(page);
+ goto out;
+ }
if (frontswap_store(page) == 0) {
set_page_writeback(page);
unlock_page(page);