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(a)arndb.de&gt; Fixes: 99d56ff7c1c ("staging/lustre: Always try kmalloc first for OBD_ALLOC_LARGE") diff --git a/drivers/staging/lustre/lustre/include/obd_support.h b/drivers/staging/lustre/lustre/include/obd_support.h index 379266d6bcd9..c0136ee778e3 100644 --- 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)