This requires the pagemap code to be able to recognize the newly introduced
swap special pte for uffd-wp, meanwhile the general case for hugetlb that we
recently start to support. It should make pagemap uffd-wp support complete.
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
fs/proc/task_mmu.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 9c5af77b5290..988e29fa1f00 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1389,6 +1389,8 @@ static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
flags |= PM_SWAP;
if (is_pfn_swap_entry(entry))
page = pfn_swap_entry_to_page(entry);
+ } else if (pte_swp_uffd_wp_special(pte)) {
+ flags |= PM_UFFD_WP;
}
if (page && !PageAnon(page))
@@ -1522,10 +1524,15 @@ static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
if (page_mapcount(page) == 1)
flags |= PM_MMAP_EXCLUSIVE;
+ if (huge_pte_uffd_wp(pte))
+ flags |= PM_UFFD_WP;
+
flags |= PM_PRESENT;
if (pm->show_pfn)
frame = pte_pfn(pte) +
((addr & ~hmask) >> PAGE_SHIFT);
+ } else if (pte_swp_uffd_wp_special(pte)) {
+ flags |= PM_UFFD_WP;
}
for (; addr != end; addr += PAGE_SIZE) {
--
2.31.1
