[PARISC] Only write to memory in test_and_set_bit/test_and_clear_bit if we're
going to change the bit. Signed-off-by: NMatthew Wilcox <matthew@wil.cx> Signed-off-by: NKyle McMartin <kyle@parisc-linux.org>
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going to change the bit. Signed-off-by: NMatthew Wilcox <matthew@wil.cx> Signed-off-by: NKyle McMartin <kyle@parisc-linux.org>