staging: lustre: remove unused variable warning

A recent patch to simplify the lustre large memory allocation
causes new warnings as an unintended side-effect:

lustre/lov/lov_request.c: In function 'lov_finish_set':
lustre/lov/lov_request.c:78:7: warning: unused variable 'len' [-Wunused-variable]
   int len = set->set_oabufs * sizeof(*set->set_pga);
       ^
lustre/obdclass/acl.c: In function 'lustre_ext_acl_xattr_reduce_space':
lustre/obdclass/acl.c:123:6: warning: unused variable 'old_size' [-Wunused-variable]
  int old_size = CFS_ACL_XATTR_SIZE(old_count, ext_acl_xattr);
      ^

The reason is that the 'size' argument to OBD_FREE_LARGE()
is never needed, which was previously hidden by the extra
abstractions.

This avoids the warnings by adding a cast to void, to tell
the compiler that the argument is intentionally unused.
A better fix is probably to remove the entire set of allocation
macros and open-code the normal kernel interface calls.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 99d56ff7c1c ("staging/lustre: Always try kmalloc first for OBD_ALLOC_LARGE")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/include/obd_support.h b/drivers/staging/lustre/lustre/include/obd_support.h
index 379266d6bcd9b15b988c5850a37f5f209fd072ed..c0136ee778e32e478b08f9a9089afe98956cc343 100644 (file)
--- a/drivers/staging/lustre/lustre/include/obd_support.h
+++ b/drivers/staging/lustre/lustre/include/obd_support.h
@@ -688,6 +688,7 @@ do {                                                                              \
 
 #define OBD_FREE_LARGE(ptr, size)                                           \
 do {                                                                     \
+       (void)(size);                                                   \
        kvfree(ptr);                                                      \
 } while (0)