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Subject: [RFC PATCH v2 1/9] mm: Add new mm flags for Copy-On-Write PTE table
Date:   Wed, 28 Sep 2022 00:29:49 +0800
Message-Id: <20220927162957.270460-2-shiyn.lin@gmail.com>
In-Reply-To: <20220927162957.270460-1-shiyn.lin@gmail.com>
References: <20220927162957.270460-1-shiyn.lin@gmail.com>
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Add MMF_COW_PTE{, _READY} flags to prepare the subsequent
implementation of Copy-On-Write for the page table.

Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com>
---
 include/linux/sched/coredump.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h
index 4d0a5be28b70f..f03ff69c90c8c 100644
--- a/include/linux/sched/coredump.h
+++ b/include/linux/sched/coredump.h
@@ -84,7 +84,13 @@ static inline int get_dumpable(struct mm_struct *mm)
 #define MMF_HAS_PINNED		28	/* FOLL_PIN has run, never cleared */
 #define MMF_DISABLE_THP_MASK	(1 << MMF_DISABLE_THP)
 
+#define MMF_COW_PTE_READY	29
+#define MMF_COW_PTE_READY_MASK	(1 << MMF_COW_PTE_READY)
+
+#define MMF_COW_PTE		30
+#define MMF_COW_PTE_MASK	(1 << MMF_COW_PTE)
+
 #define MMF_INIT_MASK		(MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\
-				 MMF_DISABLE_THP_MASK)
+				 MMF_DISABLE_THP_MASK | MMF_COW_PTE_MASK)
 
 #endif /* _LINUX_SCHED_COREDUMP_H */
-- 
2.37.3