Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
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 3/9] powerpc/pseries: remove the ppc-cmm file system
Date:   Tue,  9 Mar 2021 16:53:42 +0100
Message-Id: <20210309155348.974875-4-hch@lst.de>
In-Reply-To: <20210309155348.974875-1-hch@lst.de>
References: <20210309155348.974875-1-hch@lst.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Just use the generic anon_inode file system.

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