linux-kernel - [PATCH 01/16] mm/shmem: update shmem to use mmap

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Message-ID: <2f84230f9087db1c62860c1a03a90416b8d7742e.1757329751.git.lorenzo.stoakes@oracle.com>
Date: Mon,  8 Sep 2025 12:10:32 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
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Subject: [PATCH 01/16] mm/shmem: update shmem to use mmap_prepare

This simply assigns the vm_ops so is easily updated - do so.

Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
---
 mm/shmem.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 29e1eb690125..cfc33b99a23a 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2950,16 +2950,17 @@ int shmem_lock(struct file *file, int lock, struct ucounts *ucounts)
 	return retval;
 }
 
-static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
+static int shmem_mmap_prepare(struct vm_area_desc *desc)
 {
+	struct file *file = desc->file;
 	struct inode *inode = file_inode(file);
 
 	file_accessed(file);
 	/* This is anonymous shared memory if it is unlinked at the time of mmap */
 	if (inode->i_nlink)
-		vma->vm_ops = &shmem_vm_ops;
+		desc->vm_ops = &shmem_vm_ops;
 	else
-		vma->vm_ops = &shmem_anon_vm_ops;
+		desc->vm_ops = &shmem_anon_vm_ops;
 	return 0;
 }
 
@@ -5229,7 +5230,7 @@ static const struct address_space_operations shmem_aops = {
 };
 
 static const struct file_operations shmem_file_operations = {
-	.mmap		= shmem_mmap,
+	.mmap_prepare	= shmem_mmap_prepare,
 	.open		= shmem_file_open,
 	.get_unmapped_area = shmem_get_unmapped_area,
 #ifdef CONFIG_TMPFS
-- 
2.51.0