signal.c: revert part of r46100

* signal.c (check_stack_overflow): revert part of r46100, the
  previous condition was correct, and fix compilation error on
  other architecture linux.  [ruby-core:62746] [Bug #9862]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46113 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 7 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index e1b873e83d..3b73defa02 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun May 25 20:00:23 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* signal.c (check_stack_overflow): revert part of r46100, the
+	  previous condition was correct, and fix compilation error on
+	  other architecture linux.  [ruby-core:62746] [Bug #9862]
+
 Sun May 25 17:09:13 2014  Tanaka Akira  <akr@fsij.org>
 
 	* test/lib/minitest/unit.rb: Less ObjectSpace.each_object(Tempfile)
diff --git a/signal.c b/signal.c
index 5af01fe087..675076094f 100644
--- a/signal.c
+++ b/signal.c
@@ -702,7 +702,7 @@ rb_get_next_signal(void)
 
 #if defined(USE_SIGALTSTACK) || defined(_WIN32)
 NORETURN(void ruby_thread_stack_overflow(rb_thread_t *th));
-#if (defined(HAVE_UCONTEXT_H) && (defined __i386__ || defined __x86_64__))
+#if !(defined(HAVE_UCONTEXT_H) && (defined __i386__ || defined __x86_64__))
 #elif defined __linux__
 # define USE_UCONTEXT_REG 1
 #elif defined __APPLE__