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In order to prevent compiler from merging or refetching load/store operations or unwanted reordering, we take the implemetation of READ_ONCE()/WRITE_ONCE() from kernel sources under "/include/asm-generic/rwonce.h". Use WRITE_ONCE() in function flip_sys_cpu_util() to ensure the compiler doesn't perform unnecessary optimization so the compiler won't make incorrect assumptions when performing the operation of modifying of bit flipping. Signed-off-by: I Hsin Cheng <richard120310@gmail.com> |
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vmlinux |