[PATCH RFC PKS/PMEM 34/58] fs/erofs: Utilize new kmap_thread()

[ira.weiny@xxxxxxxxx]

From: Ira Weiny <ira.weiny@xxxxxxxxx>

The kmap() calls in this FS are localized to a single thread.  To avoid
the over head of global PKRS updates use the new kmap_thread() call.

Cc: Gao Xiang <xiang@xxxxxxxxxx>
Cc: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
 fs/erofs/super.c | 4 ++--
 fs/erofs/xattr.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index ddaa516c008a..41696b60f1b3 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -139,7 +139,7 @@ static int erofs_read_superblock(struct super_block *sb)
 
        sbi = EROFS_SB(sb);
 
-       data = kmap(page);
+       data = kmap_thread(page);
        dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
 
        ret = -EINVAL;
@@ -189,7 +189,7 @@ static int erofs_read_superblock(struct super_block *sb)
        }
        ret = 0;
 out:
-       kunmap(page);
+       kunmap_thread(page);
        put_page(page);
        return ret;
 }
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index c8c381eadcd6..1771baa99d77 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -20,7 +20,7 @@ static inline void xattr_iter_end(struct xattr_iter *it, bool 
atomic)
 {
        /* the only user of kunmap() is 'init_inode_xattrs' */
        if (!atomic)
-               kunmap(it->page);
+               kunmap_thread(it->page);
        else
                kunmap_atomic(it->kaddr);
 
@@ -96,7 +96,7 @@ static int init_inode_xattrs(struct inode *inode)
        }
 
        /* read in shared xattr array (non-atomic, see kmalloc below) */
-       it.kaddr = kmap(it.page);
+       it.kaddr = kmap_thread(it.page);
        atomic_map = false;
 
        ih = (struct erofs_xattr_ibody_header *)(it.kaddr + it.ofs);
-- 
2.28.0.rc0.12.gb6a658bd00c9