Messages in this thread Patch in this message | | | From | Chih-En Lin <> | Subject | [PATCH v3 12/14] fs/proc: Support COW PTE with clear_refs_write | Date | Tue, 20 Dec 2022 15:27:41 +0800 |
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Before clearing the entry in COW-ed PTE, break COW PTE first.
Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com> --- fs/proc/task_mmu.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 8a74cdcc9af00..7d34b036c1b96 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1190,6 +1190,9 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, if (pmd_trans_unstable(pmd)) return 0; + if (break_cow_pte(vma, pmd, addr) < 0) + return 0; + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) { ptent = *pte; -- 2.37.3
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