mm, /proc/pid/pagemap: fix soft dirty marking for PMD migration entry

[sfrench/cifs-2.6.git] / fs / proc / task_mmu.c

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 7b40e11ede9bbf718e31e23819bf36cfd1093b76..6744bd706ecf018f0db0a3e335449945b523ea74 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/mm.h>
 #include <linux/vmacache.h>
 #include <linux/hugetlb.h>
@@ -1310,13 +1311,15 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
                pmd_t pmd = *pmdp;
                struct page *page = NULL;
 
-               if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd))
+               if (vma->vm_flags & VM_SOFTDIRTY)
                        flags |= PM_SOFT_DIRTY;
 
                if (pmd_present(pmd)) {
                        page = pmd_page(pmd);
 
                        flags |= PM_PRESENT;
+                       if (pmd_soft_dirty(pmd))
+                               flags |= PM_SOFT_DIRTY;
                        if (pm->show_pfn)
                                frame = pmd_pfn(pmd) +
                                        ((addr & ~PMD_MASK) >> PAGE_SHIFT);
@@ -1328,6 +1331,8 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
                        frame = swp_type(entry) |
                                (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
                        flags |= PM_SWAP;
+                       if (pmd_swp_soft_dirty(pmd))
+                               flags |= PM_SOFT_DIRTY;
                        VM_BUG_ON(!is_pmd_migration_entry(pmd));
                        page = migration_entry_to_page(entry);
                }
@@ -1474,7 +1479,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
        pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN);
 
        pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
-       pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY);
+       pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_KERNEL);
        ret = -ENOMEM;
        if (!pm.buffer)
                goto out_mm;