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(parent: 6ec2747) | patch
sparc64: Make lock backoff really a NOP on UP builds.
authorDavid S. Miller <davem@davemloft.net>
Thu, 19 Aug 2010 05:53:26 +0000 (22:53 -0700)
committerDavid S. Miller <davem@davemloft.net>
Thu, 19 Aug 2010 05:53:26 +0000 (22:53 -0700)
commit0f58189d4a3ca96d7959501ecb203177efdbc5bd
treeb5ad2f63da4c1caa5d20487cf370d51e4392111ctree
parent6ec274750c99448c3412bbc10c97ce0c993f8a4ecommit | diff
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>
arch/sparc/include/asm/backoff.h diff | blob | history
arch/sparc/lib/atomic_64.S diff | blob | history
arch/sparc/lib/bitops.S diff | blob | history
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