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From: Christoph Hellwig <hch@lst.de>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Daniel Vetter <daniel@ffwll.ch>, Nadav Amit <namit@vmware.com>,
	"VMware, Inc." <pv-drivers@vmware.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	David Hildenbrand <david@redhat.com>,
	Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>,
	Jason Gunthorpe <jgg@nvidia.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org,
	virtualization@lists.linux-foundation.org,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH 7/9] iomem: remove the iomem file system
Date: Tue,  9 Mar 2021 16:53:46 +0100
Message-ID: <20210309155348.974875-8-hch@lst.de> (raw)
In-Reply-To: <20210309155348.974875-1-hch@lst.de>

Just use the generic anon_inode file system.

Signed-off-by: Christoph Hellwig <hch@lst.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


  parent reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-09 15:53 make alloc_anon_inode more useful Christoph Hellwig
2021-03-09 15:53 ` [PATCH 1/9] fs: rename alloc_anon_inode to alloc_anon_inode_sb Christoph Hellwig
2021-03-09 16:21   ` David Hildenbrand
2021-03-09 19:33   ` Gao Xiang
2021-03-10  6:39   ` Minchan Kim
2021-03-10  8:30     ` Christoph Hellwig
2021-03-10  9:33   ` Christian Brauner
2021-03-09 15:53 ` [PATCH 2/9] fs: add an argument-less alloc_anon_inode Christoph Hellwig
2021-03-09 16:22   ` David Hildenbrand
2021-03-09 19:34   ` Gao Xiang
2021-03-10  9:35   ` Christian Brauner
2021-03-09 15:53 ` [PATCH 3/9] powerpc/pseries: remove the ppc-cmm file system Christoph Hellwig
2021-03-09 16:26   ` David Hildenbrand
2021-03-09 16:30   ` Jason Gunthorpe
2021-03-10 16:29   ` Al Viro
2021-03-11  8:42     ` Christoph Hellwig
2021-03-09 15:53 ` [PATCH 4/9] drm: remove the drm " Christoph Hellwig
2021-03-10 16:32   ` Al Viro
2021-03-11  8:35     ` Christoph Hellwig
2021-03-09 15:53 ` [PATCH 5/9] vmw_balloon: remove the balloon-vmware " Christoph Hellwig
2021-03-09 16:28   ` David Hildenbrand
2021-03-09 15:53 ` [PATCH 6/9] virtio_balloon: remove the balloon-kvm " Christoph Hellwig
2021-03-09 16:29   ` David Hildenbrand
2021-03-09 15:53 ` Christoph Hellwig [this message]
2021-03-14 13:55   ` [iomem] e14497b88f: BUG:KASAN:null-ptr-deref_in_alloc_anon_inode kernel test robot
2021-03-09 15:53 ` [PATCH 8/9] z3fold: remove the z3fold file system Christoph Hellwig
2021-03-09 15:53 ` [PATCH 9/9] zsmalloc: remove the zsmalloc " Christoph Hellwig
2021-03-10  6:44   ` Minchan Kim
2021-03-09 16:54 ` make alloc_anon_inode more useful Jason Gunthorpe
2021-03-10  8:32   ` Christoph Hellwig
2021-03-10  4:05 ` Matthew Wilcox
2021-03-10  8:37   ` Christoph Hellwig

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