]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
Add support for GCC-4.5's __builtin_unreachable() to compiler.h (v2)
authorDavid Daney <ddaney@caviumnetworks.com>
Sat, 5 Dec 2009 01:44:50 +0000 (17:44 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 5 Dec 2009 17:10:12 +0000 (09:10 -0800)
commit38938c879eb0c39edf85d5164aa0cffe2874304c
treefdcc22972a02219dcb385dae868f6e708523dfe7
parent22763c5cf3690a681551162c15d34d935308c8d7
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>
include/linux/compiler-gcc4.h
include/linux/compiler.h