From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Kanoj Sarcar <kanoj@google.engr.sgi.com>
Cc: Manfred Spraul <manfreds@colorfullife.com>,
linux-kernel@vger.rutgers.edu, linux-mm@kvack.org,
torvalds@transmeta.com, davem@redhat.com,
alan@lxorguk.ukuu.org.uk
Subject: Re: zap_page_range(): TLB flush race
Date: Sun, 9 Apr 2000 00:37:05 +0100 (BST) [thread overview]
Message-ID: <E12e4mo-0003Pn-00@the-village.bc.nu> (raw)
In-Reply-To: <200004082331.QAA78522@google.engr.sgi.com> from "Kanoj Sarcar" at Apr 08, 2000 04:31:38 PM
> > Yes, establish_pte() is broken. We should reverse the calls:
> >
> > set_pte(); /* update the kernel page tables */
> > update_mmu(); /* update architecture specific page tables. */
> > flush_tlb(); /* and flush the hardware tlb */
> >
>
> People are aware of this too, it was introduced during the 390 merge.
> I tried talking to the IBM guy about this, I didn't see a response from
> him ...
Strange since I did and it included you
> I think what we now need is a critical mass, something that will make us
> go "okay, lets just fix these races once and for all".
Basically establish_pte() has to be architecture specific, as some processors
need different orders either to avoid races or to handle cpu specific
limitations.
Alan
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next prev parent reply other threads:[~2000-04-08 23:37 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-04-08 20:06 Manfred Spraul
2000-04-08 21:11 ` Kanoj Sarcar
2000-04-08 22:46 ` Manfred Spraul
2000-04-08 23:31 ` Kanoj Sarcar
2000-04-08 23:37 ` Alan Cox [this message]
2000-04-08 23:54 ` Kanoj Sarcar
2000-04-09 9:10 ` Manfred Spraul
2000-04-09 9:19 ` David S. Miller
2000-04-10 22:21 ` Stephen C. Tweedie
2000-04-10 23:12 ` David S. Miller
2000-04-11 9:14 ` Stephen C. Tweedie
2000-04-11 14:41 ` Manfred Spraul
2000-04-11 16:40 ` Andrea Arcangeli
2000-04-11 17:45 ` Manfred Spraul
2000-04-11 18:14 ` Kanoj Sarcar
2000-04-12 10:02 ` Jamie Lokier
2000-04-11 11:56 ` Alan Cox
2000-04-08 23:44 ` David S. Miller
2000-04-09 0:20 ` Kanoj Sarcar
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