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[RFC,1/6] mm: Add a new mm flag for Copy-On-Write PTE table

Message ID 20220519183127.3909598-2-shiyn.lin@gmail.com (mailing list archive)
State New
Headers show
Series Introduce Copy-On-Write to Page Table | expand

Commit Message

Chih-En Lin May 19, 2022, 6:31 p.m. UTC 
Add MMF_COW_PGTABLE flag 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 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h
index 4d9e3a656875..19e9f2b71398 100644
--- a/include/linux/sched/coredump.h
+++ b/include/linux/sched/coredump.h
@@ -83,7 +83,10 @@  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_PGTABLE		29
+#define MMF_COW_PGTABLE_MASK	(1 << MMF_COW_PGTABLE)
+
 #define MMF_INIT_MASK		(MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\
-				 MMF_DISABLE_THP_MASK)
+				 MMF_DISABLE_THP_MASK | MMF_COW_PGTABLE_MASK)
 
 #endif /* _LINUX_SCHED_COREDUMP_H */