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

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To: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Subject: Re: [PATCH] add delay between port write and port read
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 27 Feb 2019 09:28:56 -0800
Cc: Will Deacon <will.deacon@xxxxxxx>, "Maciej W. Rozycki" <macro@xxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Sinan Kaya <okaya@xxxxxxxxxxxxxx>, Matt Turner <mattst88@xxxxxxxxx>, alpha <linux-alpha@xxxxxxxxxxxxxxx>, Sinan Kaya <okaya@xxxxxxxxxx>
In-reply-to: <alpine.LRH.2.02.1902271202390.9163@file01.intranet.prod.int.rdu2.redhat.com>
References: <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> <20190226183755.GD28709@fuggles.cambridge.arm.com> <CAHk-=wjMTeS=GkrRrsfTEo3UxRQ4YcXKM_h1RSFdjYQM7jyMcw@mail.gmail.com> <alpine.LRH.2.02.1902271202390.9163@file01.intranet.prod.int.rdu2.redhat.com>

On Wed, Feb 27, 2019 at 9:05 AM Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote:
>
> Should "writeb_relaxed" on Alpha also use the barrier?

I think they should.  Only the double-underscore (__raw_xyz()) ones
are entirely unordered, the relaxed ones are just unordered wrt
regular memory and DMA.

That said, I doubt anything much cares, and I'm not sure alpha has
ever done that.

                 Linus

Follow-Ups:
- Re: [PATCH] add delay between port write and port read
  - From: Maciej W. Rozycki

References:
- 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: Will Deacon
- 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

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