Re: [PATCH] add delay between port write and port read

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To: Sinan Kaya <Okaya@xxxxxxxxxx>
Subject: Re: [PATCH] add delay between port write and port read
From: "Maciej W. Rozycki" <macro@xxxxxxxxxxxxxx>
Date: Wed, 27 Feb 2019 18:12:18 +0000 (GMT)
Cc: Mikulas Patocka <mpatocka@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Sinan Kaya <okaya@xxxxxxxxxxxxxx>, Matt Turner <mattst88@xxxxxxxxx>, alpha <linux-alpha@xxxxxxxxxxxxxxx>, Will Deacon <will.deacon@xxxxxxx>
In-reply-to: <ecfd96c3-bc10-b1ed-6863-9bccc4c05e67@kernel.org>
References: <alpine.LRH.2.02.1808161556450.13597@file01.intranet.prod.int.rdu2.redhat.com> <alpine.LFD.2.21.1902191652400.2486@eddie.linux-mips.org> <alpine.LRH.2.02.1902191234040.20738@file01.intranet.prod.int.rdu2.redhat.com> <alpine.LFD.2.21.1902191933170.2486@eddie.linux-mips.org> <alpine.LRH.2.02.1902201000370.18786@file01.intranet.prod.int.rdu2.redhat.com> <alpine.LFD.2.21.1902201526380.2486@eddie.linux-mips.org> <CAK8P3a3erCa177cp7ap_JqRREQqwj9sTQi7JZH_=1601qT90AQ@mail.gmail.com> <alpine.LRH.2.02.1902201229490.18962@file01.intranet.prod.int.rdu2.redhat.com> <alpine.LFD.2.21.1902202004240.2486@eddie.linux-mips.org> <alpine.LRH.2.02.1902211426590.12431@file01.intranet.prod.int.rdu2.redhat.com> <alpine.LFD.2.21.1902211948200.2486@eddie.linux-mips.org> <CAHk-=wgF2oP2o8eSA5CRmo-O8K9xZPM0wmGddE6F1W-T4qGapg@mail.gmail.com> <alpine.LRH.2.02.1902271205360.9163@file01.intranet.prod.int.rdu2.redhat.com> <ecfd96c3-bc10-b1ed-6863-9bccc4c05e67@kernel.org>
User-agent: Alpine 2.21 (LFD 202 2017-01-01)

On Wed, 27 Feb 2019, Sinan Kaya wrote:

> What we missed is the fact that alpha reorders accesses across two
> register accesses. This is guaranteed in other architectures.

 Not for MIPS either.

  Maciej

References:
- Alpha Avanti broken by 9ce8654323d69273b4977f76f11c9e2d345ab130
  - From: Mikulas Patocka
- Re: [PATCH] add delay between port write and port read
  - From: Maciej W. Rozycki
- Re: [PATCH] add delay between port write and port read
  - From: Mikulas Patocka
- Re: [PATCH] add delay between port write and port read
  - From: Maciej W. Rozycki
- Re: [PATCH] add delay between port write and port read
  - From: Mikulas Patocka
- Re: [PATCH] add delay between port write and port read
  - From: Maciej W. Rozycki
- Re: [PATCH] add delay between port write and port read
  - From: Arnd Bergmann
- Re: [PATCH] add delay between port write and port read
  - From: Mikulas Patocka
- Re: [PATCH] add delay between port write and port read
  - From: Maciej W. Rozycki
- Re: [PATCH] add delay between port write and port read
  - From: Mikulas Patocka
- Re: [PATCH] add delay between port write and port read
  - From: Maciej W. Rozycki
- Re: [PATCH] add delay between port write and port read
  - From: Linus Torvalds
- Re: [PATCH] add delay between port write and port read
  - From: Mikulas Patocka
- Re: [PATCH] add delay between port write and port read
  - From: Sinan Kaya

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