cifs: remove kmap lock and rsize limit

Now that we aren't abusing the kmap address space, there's no need for
this lock or to impose a limit on the rsize.

Signed-off-by: Jeff Layton <jlayton@redhat.com>

1 files changed, 0 insertions, 39 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 79e8b6f06021..b2bb941d8ddd 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -638,45 +638,6 @@ get_next_mid(struct TCP_Server_Info *server)
 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
 
 /*
- * On hosts with high memory, we can't currently support wsize/rsize that are
- * larger than we can kmap at once. Cap the rsize/wsize at
- * LAST_PKMAP * PAGE_SIZE. We'll never be able to fill a read or write request
- * larger than that anyway.
- */
-#ifdef CONFIG_HIGHMEM
-#define CIFS_KMAP_SIZE_LIMIT   (LAST_PKMAP * PAGE_CACHE_SIZE)
-#else /* CONFIG_HIGHMEM */
-#define CIFS_KMAP_SIZE_LIMIT   (1<<24)
-#endif /* CONFIG_HIGHMEM */
-
-#ifdef CONFIG_HIGHMEM
-/*
- * On arches that have high memory, kmap address space is limited. By
- * serializing the kmap operations on those arches, we ensure that we don't
- * end up with a bunch of threads in writeback with partially mapped page
- * arrays, stuck waiting for kmap to come back. That situation prevents
- * progress and can deadlock.
- */
-
-extern struct mutex cifs_kmap_mutex;
-
-static inline void
-cifs_kmap_lock(void)
-{
-        mutex_lock(&cifs_kmap_mutex);
-}
-
-static inline void
-cifs_kmap_unlock(void)
-{
-        mutex_unlock(&cifs_kmap_mutex);
-}
-#else /* !CONFIG_HIGHMEM */
-#define cifs_kmap_lock() do { ; } while (0)
-#define cifs_kmap_unlock() do { ; } while (0)
-#endif /* CONFIG_HIGHMEM */
-
-/*
  * Macros to allow the TCP_Server_Info->net field and related code to drop out
  * when CONFIG_NET_NS isn't set.
  */