linux-kernel - [PATCH 18/20] mm/mshare: provide a way to identify an mm as an mshare host mm

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Message-ID: <20250124235454.84587-19-anthony.yznaga@oracle.com>
Date: Fri, 24 Jan 2025 15:54:52 -0800
From: Anthony Yznaga <anthony.yznaga@...cle.com>
To: akpm@...ux-foundation.org, willy@...radead.org, markhemm@...glemail.com,
        viro@...iv.linux.org.uk, david@...hat.com, khalid@...nel.org
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Subject: [PATCH 18/20] 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 5f1b2dc788e2..dfbeb50e4c9b 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -1642,6 +1642,8 @@ enum {
 #define MMF_TOPDOWN		31	/* mm searches top down by default */
 #define MMF_TOPDOWN_MASK	(1 << MMF_TOPDOWN)
 
+#define MMF_MSHARE		32	/* mm is an mshare host mm */
+
 #define MMF_INIT_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 8f53b8132895..4c3f6c2410d6 100644
--- a/mm/mshare.c
+++ b/mm/mshare.c
@@ -365,6 +365,7 @@ msharefs_fill_mm(struct inode *inode)
 		goto err_free;
 	}
 
+	set_bit(MMF_MSHARE, &mm->flags);
 	mm->mmap_base = mm->task_size = 0;
 
 	m_data = kzalloc(sizeof(*m_data), GFP_KERNEL);
-- 
2.43.5