Add 'volatile' to the unreachable annotation macro inline asm
statements.  They're already implicitly volatile because they don't have
output constraints, but it's clearer and more robust to make them
explicitly volatile.
Suggested-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/28659257b7a6adf4a7f65920dad70b2b0226e996.1509974104.git.jpoimboe@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>