cpumask: Mark functions as pure
cpumask_next_and() and cpumask_any_but() are pure, and marking them as such seems to generate different and presumably better code for native_flush_tlb_multi(). Signed-off-by: NNadav Amit <namit@vmware.com> Signed-off-by: NIngo Molnar <mingo@kernel.org> Reviewed-by: NDave Hansen <dave.hansen@linux.intel.com> Link: https://lore.kernel.org/r/20210220231712.2475218-8-namit@vmware.com
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