linux-kernel - [PATCH 7/9] iomem: remove the iomem file system

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Date:   Tue,  9 Mar 2021 16:53:46 +0100
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Vetter <daniel@...ll.ch>, Nadav Amit <namit@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 7/9] iomem: remove the iomem file system

Just use the generic anon_inode file system.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 kernel/resource.c | 30 ++++--------------------------
 1 file changed, 4 insertions(+), 26 deletions(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index 0fd091a3f2fc66..12560553c26796 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -26,6 +26,7 @@
 #include <linux/mm.h>
 #include <linux/mount.h>
 #include <linux/resource_ext.h>
+#include <linux/anon_inodes.h>
 #include <uapi/linux/magic.h>
 #include <asm/io.h>
 
@@ -1838,37 +1839,14 @@ static int __init strict_iomem(char *str)
 	return 1;
 }
 
-static int iomem_fs_init_fs_context(struct fs_context *fc)
-{
-	return init_pseudo(fc, DEVMEM_MAGIC) ? 0 : -ENOMEM;
-}
-
-static struct file_system_type iomem_fs_type = {
-	.name		= "iomem",
-	.owner		= THIS_MODULE,
-	.init_fs_context = iomem_fs_init_fs_context,
-	.kill_sb	= kill_anon_super,
-};
-
 static int __init iomem_init_inode(void)
 {
-	static struct vfsmount *iomem_vfs_mount;
-	static int iomem_fs_cnt;
 	struct inode *inode;
-	int rc;
-
-	rc = simple_pin_fs(&iomem_fs_type, &iomem_vfs_mount, &iomem_fs_cnt);
-	if (rc < 0) {
-		pr_err("Cannot mount iomem pseudo filesystem: %d\n", rc);
-		return rc;
-	}
 
-	inode = alloc_anon_inode_sb(iomem_vfs_mount->mnt_sb);
+	inode = alloc_anon_inode();
 	if (IS_ERR(inode)) {
-		rc = PTR_ERR(inode);
-		pr_err("Cannot allocate inode for iomem: %d\n", rc);
-		simple_release_fs(&iomem_vfs_mount, &iomem_fs_cnt);
-		return rc;
+		pr_err("Cannot allocate inode for iomem: %zd\n", PTR_ERR(inode));
+		return PTR_ERR(inode);
 	}
 
 	/*
-- 
2.30.1