tree fdcc22972a02219dcb385dae868f6e708523dfe7
parent 22763c5cf3690a681551162c15d34d935308c8d7
author David Daney <ddaney@caviumnetworks.com> 1259977490 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1260033012 -0800

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>