Commits
Martin Schwidefsky committed acdc9fc9a81
s390/bitops: implement cache friendly test_and_set_bit_lock The generic implementation for test_and_set_bit_lock in include/asm-generic uses the standard test_and_set_bit operation. This is done with either a 'csg' or a 'loag' instruction. For both version the cache line is fetched exclusively, even if the bit is already set. The result is an increase in cache traffic, for a contented lock this is a bad idea. Acked-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>