On Mon, Jan 20, 2020 at 03:40:48PM +0100, Peter Zijlstra wrote: > On Mon, Jan 20, 2020 at 03:19:25PM +0100, Marco Elver wrote: > > Add explicit KCSAN checks for bitops. > > > > Note that test_bit() is an atomic bitop, and we instrument it as such, > > Well, it is 'atomic' in the same way that atomic_read() is. Both are > very much not atomic ops, but are part of an interface that facilitates > atomic operations. True, but they all are either inline assembly or have either an implicit or explicit cast to volatile, so they could be treated the same as atomic_read(), correct? If not, what am I missing? (There is one exception, but it is in arch/x86/boot/bitops.h, which I UP-only, correct?) Thanx, Paul
