linux-kernel - [PATCH v3 21/22] mm/mshare: provide a way to identify an mm as an mshare host mm

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Message-ID: <20250820010415.699353-22-anthony.yznaga@oracle.com>
Date: Tue, 19 Aug 2025 18:04:14 -0700
From: Anthony Yznaga <anthony.yznaga@...cle.com>
To: linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, andreyknvl@...il.com, arnd@...db.de,
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Subject: [PATCH v3 21/22] mm/mshare: provide a way to identify an mm as an mshare host mm

Add new mm flag, MMF_MSHARE.

Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 include/linux/mm_types.h | 2 ++
 mm/mshare.c              | 1 +
 2 files changed, 3 insertions(+)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index da5a7a31a81d..4586a3f384f1 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -1847,6 +1847,8 @@ enum {
 #define MMF_TOPDOWN		31	/* mm searches top down by default */
 #define MMF_TOPDOWN_MASK	_BITUL(MMF_TOPDOWN)
 
+#define MMF_MSHARE		32	/* mm is an mshare host mm */
+
 #define MMF_INIT_LEGACY_MASK	(MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\
 				 MMF_DISABLE_THP_MASK | MMF_HAS_MDWE_MASK |\
 				 MMF_VM_MERGE_ANY_MASK | MMF_TOPDOWN_MASK)
diff --git a/mm/mshare.c b/mm/mshare.c
index ddcf7bb2e956..22e2aedb74d3 100644
--- a/mm/mshare.c
+++ b/mm/mshare.c
@@ -578,6 +578,7 @@ msharefs_fill_mm(struct inode *inode)
 	if (!mm)
 		return -ENOMEM;
 
+	mm_flags_set(MMF_MSHARE, mm);
 	mm->mmap_base = mshare_base;
 	mm->task_size = 0;
 
-- 
2.47.1