alpha: half done futex implementation
segher at kernel.crashing.org
Tue Apr 14 19:40:50 EST 2009
> Also, there's a bug in the powerpc implementation. It appears that
> oparg is clobbered, and if stwcx fails the operation will be
> repeated with incorrect inputs.
If either the lwarx or the stwcx. faults, the routine returns -EFAULT
and doesn't retry (label "3" is the end of the asm).
If the stwcx. fails because the CPU lost the reservation, %1 isn't
clobbered as far as I see?
More information about the Linuxppc-dev