21 Dec, 2010
1 commit
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The cnt32_to_63 algorithm relies on proper counter data evaluation
ordering to work properly. This was missing from the provided
documentation.Let's augment the documentation with the missing usage constraint and
fix the only instance that got it wrong.Signed-off-by: Nicolas Pitre
Acked-by: David Howells
Signed-off-by: Linus Torvalds
10 Nov, 2008
1 commit
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Currently, all existing users of cnt32_to_63() are fine since the CPU
architectures where it is used don't do read access reordering, and user
mode preemption is disabled already. It is nevertheless a good idea to
better elaborate usage requirements wrt preemption, and use an explicit
memory barrier on SMP to avoid different CPUs accessing the counter
value in the wrong order. On UP a simple compiler barrier is
sufficient.Signed-off-by: Nicolas Pitre
Acked-by: Mathieu Desnoyers
Signed-off-by: Linus Torvalds
25 Sep, 2008
1 commit
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Move asm-arm/cnt32_to_63.h to include/linux/ so that MN10300 can make
use of it too.Signed-off-by: David Howells
Signed-off-by: Linus Torvalds