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| author | Steven Price <steven.price@arm.com> | 2020-05-13 17:37:49 +0200 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-09-04 13:46:07 +0200 |
| commit | 8a84802e2a2b1a682761a31c2685506b9f4e1840 (patch) | |
| tree | f1833efdf37bde1c4281f9864c38d2f53810a2c3 /mm/swapfile.c | |
| parent | fs: Handle intra-page faults in copy_mount_options() (diff) | |
| download | linux-8a84802e2a2b1a682761a31c2685506b9f4e1840.tar.xz linux-8a84802e2a2b1a682761a31c2685506b9f4e1840.zip | |
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/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 12f59e641b5e..4b1d1a04e327 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -717,6 +717,7 @@ static void swap_range_free(struct swap_info_struct *si, unsigned long offset, else swap_slot_free_notify = NULL; while (offset <= end) { + arch_swap_invalidate_page(si->type, offset); frontswap_invalidate_page(si->type, offset); if (swap_slot_free_notify) swap_slot_free_notify(si->bdev, offset); @@ -2682,6 +2683,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile) frontswap_map = frontswap_map_get(p); spin_unlock(&p->lock); spin_unlock(&swap_lock); + arch_swap_invalidate_area(p->type); frontswap_invalidate_area(p->type); frontswap_map_set(p, NULL); mutex_unlock(&swapon_mutex); |