sparc64: Use pause instruction when available.

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In atomic backoff and cpu_relax(), use the pause instruction
found on SPARC-T4 and later.

It makes the cpu strand unselectable for the given number of
cycles, unless an intervening disrupting trap occurs.

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

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This commit is contained in:

David S. Miller 2012-10-27 23:00:41 -07:00

parent 270c10e00a

commit e9b9eb59ff

5 changed files with 62 additions and 16 deletions

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32

arch/sparc/include/asm/backoff.h

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13

arch/sparc/include/asm/processor_64.h

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7

arch/sparc/kernel/entry.h

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21

arch/sparc/kernel/setup_64.c

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5

arch/sparc/kernel/vmlinux.lds.S

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