fs: dlm: use READ_ONCE for config var

This patch will use READ_ONCE to signal the compiler to read this
variable only one time. If we don't do that it could be that the
compiler read this value more than one time, because some optimizations,
from the configure data which might can be changed during this time.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index d71aba8c3e64b917201fc22ed4511e4da1ef57db..23c2d7308050f65682fda7860bf7df10b05021f7 100644 (file)
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -498,7 +498,7 @@ static int new_lockspace(const char *name, const char *cluster,
        ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS |
                                    DLM_LSFL_NEWEXCL));
 
-       size = dlm_config.ci_rsbtbl_size;
+       size = READ_ONCE(dlm_config.ci_rsbtbl_size);
        ls->ls_rsbtbl_size = size;
 
        ls->ls_rsbtbl = vmalloc(array_size(size, sizeof(struct dlm_rsbtable)));