[Bug build/13844] `nptl/sysdeps/unix/sysv/linux/sparc/sparc32/libc-lowlevellock.c' missing in glibc sources

[davem at davemloft dot net]

http://sourceware.org/bugzilla/show_bug.cgi?id=13844

--- Comment #4 from David S. Miller <davem at davemloft dot net> 2012-03-16 03:51:14 UTC ---
Sparc needs a custom lowlevellock.c on 32-bit sparc because
we have a situation where we don't know if we have the
proper atomic instructions available or not.

For example, if we don't have the v9 compare-and-swap available
we use spinlocks instead.  And for futexes we use a special
24-bit atomic, which embeds the spinlock in the remaining
8-bits.  That's what all of those atomic_compare_and_exchange_val_24_acq
etc. routines are all about.

I'll just add the necessary sparc32/libc-lowlevellock.c file
to fix this, thanks for the report.

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