linux-kernel - [PATCH RFC] mm: pagemap: add vma(VM_PFNMAP) support in pagemap_pte

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Message-Id: <20230213020807.1985422-1-sunke@kylinos.cn>
Date:   Mon, 13 Feb 2023 10:08:07 +0800
From:   Ke Sun <sunke@...inos.cn>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Ke Sun <sunke@...inos.cn>
Subject: [PATCH RFC] mm: pagemap: add vma(VM_PFNMAP) support in pagemap_pte_hole()

pagemap currently does not support vma(FIXMAP), add support
in pagemap_pte_hole().

Signed-off-by: Ke Sun <sunke@...inos.cn>
---
 fs/proc/task_mmu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index af1c49ae11b1..297c7b9dc630 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1400,6 +1400,11 @@ static int pagemap_pte_hole(unsigned long start, unsigned long end,
 		if (vma->vm_flags & VM_SOFTDIRTY)
 			pme = make_pme(0, PM_SOFT_DIRTY);
 		for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
+			if ((vma->vm_flags & VM_PFNMAP) && vma->vm_pgoff) {
+				unsigned long pgoff = (addr - vma->vm_start) >> PAGE_SHIFT;
+
+				pme = make_pme(vma->vm_pgoff + pgoff, PM_PRESENT);
+			}
 			err = add_to_pagemap(addr, &pme, pm);
 			if (err)
 				goto out;
-- 
2.25.1