Re: [PATCH] alpha: add udelay to io port paths

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To: Sinan Kaya <Okaya@xxxxxxxxxx>
Subject: Re: [PATCH] alpha: add udelay to io port paths
From: "Maciej W. Rozycki" <macro@xxxxxxxxxxxxxx>
Date: Fri, 5 Apr 2019 19:28:11 +0100 (BST)
Cc: Mikulas Patocka <mpatocka@xxxxxxxxxx>, Richard Henderson <rth@xxxxxxxxxxx>, Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Sinan Kaya <okaya@xxxxxxxxxxxxxx>, Matt Turner <mattst88@xxxxxxxxx>, alpha <linux-alpha@xxxxxxxxxxxxxxx>
In-reply-to: <14889d8d-c9d7-019d-ade7-476d83f755f9@kernel.org>
References: <alpine.LRH.2.02.1808161556450.13597@file01.intranet.prod.int.rdu2.redhat.com> <alpine.LRH.2.02.1902190842550.8064@file01.intranet.prod.int.rdu2.redhat.com> <alpine.LRH.2.02.1902190844210.9111@file01.intranet.prod.int.rdu2.redhat.com> <CAK8P3a0zA91kLVsrWpsKWV_W0XnsOMmhdc4RV5BAgu9NcfhOLA@mail.gmail.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> <alpine.LRH.2.02.1904031244520.4480@file01.intranet.prod.int.rdu2.redhat.com> <alpine.LFD.2.21.1904042316320.5650@eddie.linux-mips.org> <alpine.LRH.2.02.1904050535001.5958@file01.intranet.prod.int.rdu2.redhat.com> <alpine.LFD.2.21.1904051748580.5650@eddie.linux-mips.org> <14889d8d-c9d7-019d-ade7-476d83f755f9@kernel.org>
User-agent: Alpine 2.21 (LFD 202 2017-01-01)

On Fri, 5 Apr 2019, Sinan Kaya wrote:

> You basically can't remove the mb() after __ioread() and before
> __iowrite() unless your architecture guarantees IO vs. memory ordering.

 I never suggested that; please check my example too.

  Maciej

Follow-Ups:
- Re: [PATCH] alpha: add udelay to io port paths
  - From: Sinan Kaya

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

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