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2007-03-09[POWERPC] EDAC ECC software scrubberDave Jiang
Implements the per arch atomic_scrub() that EDAC uses for software ECC scrubbing. It reads memory and then writes back the original value, allowing the hardware to detect and correct memory errors. Signed-off-by: Dave Jiang <djiang@mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>