Include <sys/systm.h> for (at least) the definition of atomic functions which are sometimes used by the macros in <sys/mutex.h>; don't depend on not-quite-necessary namespace pollution in <sys/mutex.h>.
Include <sys/systm.h> for (at least) the definition of atomic functions
which are sometimes used by the macros in <sys/mutex.h>; don't depend
on not-quite-necessary namespace pollution in <sys/mutex.h>.

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