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authorDavid Daney <ddaney@caviumnetworks.com>2009-12-05 04:44:50 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-05 20:10:12 +0300
commit38938c879eb0c39edf85d5164aa0cffe2874304c (patch)
treefdcc22972a02219dcb385dae868f6e708523dfe7 /include/linux/compiler-gcc4.h
parent22763c5cf3690a681551162c15d34d935308c8d7 (diff)
downloadlinux-38938c879eb0c39edf85d5164aa0cffe2874304c.tar.xz
Add support for GCC-4.5's __builtin_unreachable() to compiler.h (v2)
Starting with version 4.5, GCC has a new built-in function __builtin_unreachable() that can be used in places like the kernel's BUG() where inline assembly is used to transfer control flow. This eliminated the need for an endless loop in these places. The patch adds a new macro 'unreachable()' that will expand to either __builtin_unreachable() or an endless loop depending on the compiler version. Change from v1: Simplify unreachable() for non-GCC 4.5 case. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/compiler-gcc4.h')
-rw-r--r--include/linux/compiler-gcc4.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
index 450fa597c94d..ab3af40a53c6 100644
--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
@@ -36,4 +36,18 @@
the kernel context */
#define __cold __attribute__((__cold__))
+
+#if __GNUC_MINOR__ >= 5
+/*
+ * Mark a position in code as unreachable. This can be used to
+ * suppress control flow warnings after asm blocks that transfer
+ * control elsewhere.
+ *
+ * Early snapshots of gcc 4.5 don't support this and we can't detect
+ * this in the preprocessor, but we can live with this because they're
+ * unreleased. Really, we need to have autoconf for the kernel.
+ */
+#define unreachable() __builtin_unreachable()
+#endif
+
#endif