linux-kernel - [PATCH 3/9] powerpc/pseries: remove the ppc-cmm file system

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Date:   Tue,  9 Mar 2021 16:53:42 +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 3/9] powerpc/pseries: remove the ppc-cmm file system

Just use the generic anon_inode file system.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/powerpc/platforms/pseries/cmm.c | 27 ++-------------------------
 1 file changed, 2 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c
index 6d36b858b14df1..9d07e6bea7126c 100644
--- a/arch/powerpc/platforms/pseries/cmm.c
+++ b/arch/powerpc/platforms/pseries/cmm.c
@@ -6,6 +6,7 @@
  * Author(s): Brian King (brking@...ux.vnet.ibm.com),
  */
 
+#include <linux/anon_inodes.h>
 #include <linux/ctype.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
@@ -502,19 +503,6 @@ static struct notifier_block cmm_mem_nb = {
 };
 
 #ifdef CONFIG_BALLOON_COMPACTION
-static struct vfsmount *balloon_mnt;
-
-static int cmm_init_fs_context(struct fs_context *fc)
-{
-	return init_pseudo(fc, PPC_CMM_MAGIC) ? 0 : -ENOMEM;
-}
-
-static struct file_system_type balloon_fs = {
-	.name = "ppc-cmm",
-	.init_fs_context = cmm_init_fs_context,
-	.kill_sb = kill_anon_super,
-};
-
 static int cmm_migratepage(struct balloon_dev_info *b_dev_info,
 			   struct page *newpage, struct page *page,
 			   enum migrate_mode mode)
@@ -573,19 +561,10 @@ static int cmm_balloon_compaction_init(void)
 	balloon_devinfo_init(&b_dev_info);
 	b_dev_info.migratepage = cmm_migratepage;
 
-	balloon_mnt = kern_mount(&balloon_fs);
-	if (IS_ERR(balloon_mnt)) {
-		rc = PTR_ERR(balloon_mnt);
-		balloon_mnt = NULL;
-		return rc;
-	}
-
-	b_dev_info.inode = alloc_anon_inode_sb(balloon_mnt->mnt_sb);
+	b_dev_info.inode = alloc_anon_inode();
 	if (IS_ERR(b_dev_info.inode)) {
 		rc = PTR_ERR(b_dev_info.inode);
 		b_dev_info.inode = NULL;
-		kern_unmount(balloon_mnt);
-		balloon_mnt = NULL;
 		return rc;
 	}
 
@@ -597,8 +576,6 @@ static void cmm_balloon_compaction_deinit(void)
 	if (b_dev_info.inode)
 		iput(b_dev_info.inode);
 	b_dev_info.inode = NULL;
-	kern_unmount(balloon_mnt);
-	balloon_mnt = NULL;
 }
 #else /* CONFIG_BALLOON_COMPACTION */
 static int cmm_balloon_compaction_init(void)
-- 
2.30.1