Re: [PATCH] mm/userfaultfd: fix memory corruption due to writeprotect

From: Andrea Arcangeli
Date: Thu Dec 24 2020 - 14:19:13 EST

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On Thu, Dec 24, 2020 at 01:49:45PM -0500, Andrea Arcangeli wrote:
> Without the above, can't the CPU decrement the tlb_flush_pending while
> the IPI to ack didn't arrive yet in csd_lock_wait?

Ehm: csd_lock_wait has smp_acquire__after_ctrl_dep() so the write side
looks ok after all sorry.

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