tree b5ad2f63da4c1caa5d20487cf370d51e4392111c
parent 6ec274750c99448c3412bbc10c97ce0c993f8a4e
author David S. Miller <davem@davemloft.net> 1282197206 -0700
committer David S. Miller <davem@davemloft.net> 1282197206 -0700

sparc64: Make lock backoff really a NOP on UP builds.

As noticed by Mikulas Patocka, the backoff macros don't
completely nop out for UP builds, we still get a
branch always and a delay slot nop.

Fix this by making the branch to the backoff spin loop
selective, then we can nop out the spin loop completely.

Signed-off-by: David S. Miller <davem@davemloft.net>