x86/mm/tlb: Also remove local CPU from mm_cpumask if stale

The code in flush_tlb_func() that removes a remote CPU from the
cpumask if it is no longer running the target mm is also needed
on the originating CPU of a TLB flush, now that CPUs are no
longer cleared from the mm_cpumask at context switch time.

Flushing the TLB when we are not running the target mm is
harmless, because the CPU's tlb_gen only gets updated to
match the mm_tlb_gen, but it does hit this warning:

        WARN_ON_ONCE(local_tlb_gen > mm_tlb_gen);

  [ 210.343902][ T4668] WARNING: CPU: 38 PID: 4668 at arch/x86/mm/tlb.c:815 flush_tlb_func (arch/x86/mm/tlb.c:815)

Removing both local and remote CPUs from the mm_cpumask
when doing a flush for a not currently loaded mm avoids
that warning.

Reported-by: kernel test robot <[email protected]>
Tested-by: kernel test robot <[email protected]>
Signed-off-by: Rik van Riel <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: https://lore.kernel.org/r/20241205104630.755706ca@fangorn
Closes: https://lore.kernel.org/oe-lkp/[email protected]

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