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

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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>

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This commit is contained in:

David S. Miller 2010-08-18 22:53:26 -07:00

parent 6ec274750c

commit 0f58189d4a

3 changed files with 22 additions and 17 deletions

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11

arch/sparc/include/asm/backoff.h

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16

arch/sparc/lib/atomic_64.S

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12

arch/sparc/lib/bitops.S

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