Allow CONFIG_foo COMPARISON-OP CONFIG_bar in preprocessor conditionals.

* parse.cxx (eval_pp_conditional): If rhs and lhs are both CONFIG_...
  identifiers try to convert them both to numbers or otherwise threat
  them both as strings for eval_comparison.
* testsuite/semok/config_config.stp: New test.

1 files changed, 17 insertions, 0 deletions

diff --git a/testsuite/semok/config_config.stp b/testsuite/semok/config_config.stp
new file mode 100755
index 00000000..287931e2
--- /dev/null
+++ b/testsuite/semok/config_config.stp
@@ -0,0 +1,17 @@
+#! stap -p2
+
+# check that CONFIGs can match other CONFIGS.
+probe
+  %( CONFIG_HZ == CONFIG_NR_CPUS
+     || CONFIG_NR_CPUS > CONFIG_HZ
+     || CONFIG_NR_CPUS < CONFIG_HZ %?
+    %( CONFIG_NFSD == CONFIG_NFS_COMMON
+       || CONFIG_NFS_COMMON != CONFIG_NFSD
+    %? begin
+    %: noprobe
+    %)
+  %: nonoprobe
+  %)
+{
+  exit()
+}