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Date: Thu, 24 Dec 2020 14:16:16 -0500 From: Andrea Arcangeli <aarcange@...hat.com> To: Nadav Amit <nadav.amit@...il.com> Cc: Yu Zhao <yuzhao@...gle.com>, Andy Lutomirski <luto@...capital.net>, Andy Lutomirski <luto@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Xu <peterx@...hat.com>, linux-mm <linux-mm@...ck.org>, lkml <linux-kernel@...r.kernel.org>, Pavel Emelyanov <xemul@...nvz.org>, Mike Kravetz <mike.kravetz@...cle.com>, Mike Rapoport <rppt@...ux.vnet.ibm.com>, stable <stable@...r.kernel.org>, Minchan Kim <minchan@...nel.org>, Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org> Subject: Re: [PATCH] mm/userfaultfd: fix memory corruption due to writeprotect 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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