x86/mm/tlb: Unify flush_tlb_func_local() and flush_tlb_func_remote()

The unification of these two functions allows to use them in the updated
SMP infrastrucutre.

To do so, remove the reason argument from flush_tlb_func_local(), add
a member to struct tlb_flush_info that says which CPU initiated the
flush and act accordingly. Optimize the size of flush_tlb_info while we
are at it.

Unfortunately, this prevents us from using a constant tlb_flush_info for
arch_tlbbatch_flush(), but in a later stage we may be able to inline
tlb_flush_info into the IPI data, so it should not have an impact
eventually.

Signed-off-by: Nadav Amit <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Dave Hansen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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