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The result of xchg() is not used, and in addition it is used on a one byte memory area which leads to inefficient code. Use WRITE_ONCE() instead to achieve the same result with much less generated code. Acked-by: Harald Freudenberger <freude@linux.ibm.com> Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>