rmap: parisc __flush_dcache_page

[Hugh Dickins]

Something to notice about that parisc __flush_dcache_page I sent you:
there's no locking around searching the tree for vmas; there was never
any locking around searching the list for vmas.  arm is similar, but
at least has no CONFIG_SMP, just a preemption issue.  Any ideas?

Thanks,
Hugh

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