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From: "Koenig, Christian" <Christian.Koenig-5C7GfCeVMHo@public.gmane.org>
To: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
	"Zhou1, Tao" <Tao.Zhou1-5C7GfCeVMHo@public.gmane.org>
Cc: "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	"kernel-build-reports-cunTk1MwBs8s++Sfvej+rw@public.gmane.org"
	<kernel-build-reports-cunTk1MwBs8s++Sfvej+rw@public.gmane.org>,
	"amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org"
	<amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>,
	"broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org"
	<broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	"linux-next-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-next-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"Deucher,
	Alexander" <Alexander.Deucher-5C7GfCeVMHo@public.gmane.org>,
	"akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org"
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	"Li, Dennis" <Dennis.Li-5C7GfCeVMHo@public.gmane.org>,
	"Zhang, Hawking" <Hawking.Zhang-5C7GfCeVMHo@public.gmane.org>
Subject: Re: [PATCH] drm/amdgpu: replace readq/writeq with atomic64 operations
Date: Wed, 7 Aug 2019 08:53:25 +0000	[thread overview]
Message-ID: <daff9fc7-ead8-40e0-9a16-cb3b90b01722@amd.com> (raw)
In-Reply-To: <20190807070834.GA24792-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>

Am 07.08.19 um 09:08 schrieb Christoph Hellwig:
> On Wed, Aug 07, 2019 at 10:56:40AM +0800, Tao Zhou wrote:
>> readq/writeq are not supported on all architectures
> NAK.  You must not use atomic_* on __iomem (MMIO) memory.

Well then what's the right thing to do here?

Essentially writeq/readq doesn't seems to be available on all 
architectures either.

Regards,
Christian.
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  parent reply	other threads:[~2019-08-07  8:53 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-07  2:56 [PATCH] drm/amdgpu: replace readq/writeq with atomic64 operations Tao Zhou
2019-08-07  3:09 ` Jisheng Zhang
     [not found]   ` <20190807105759.58a28ef0-XW7BGIvHH6X931TTwiNRCw@public.gmane.org>
2019-08-07  4:02     ` Alex Deucher
     [not found] ` <20190807025640.682-1-tao.zhou1-5C7GfCeVMHo@public.gmane.org>
2019-08-07  4:03   ` Alex Deucher
2019-08-07  7:08 ` Christoph Hellwig
     [not found]   ` <20190807070834.GA24792-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2019-08-07  8:53     ` Koenig, Christian [this message]
2019-08-07 10:41       ` Christoph Hellwig
2019-08-07 10:55         ` Koenig, Christian
2019-08-07 12:59           ` Mark Brown
     [not found]             ` <20190807125928.GC4048-7j8lgAiuQgnQXOPxS62xeg@public.gmane.org>
2019-08-07 13:00               ` Koenig, Christian
2019-08-07 13:07                 ` Christoph Hellwig
2019-08-07 13:00           ` Christoph Hellwig
     [not found]             ` <20190807130043.GA6023-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2019-08-07 13:03               ` Koenig, Christian
     [not found]                 ` <c613ca25-4443-f275-ea8d-6d55af10ac77-5C7GfCeVMHo@public.gmane.org>
2019-08-07 18:00                   ` Alex Deucher
2019-08-08 19:25 ` Guenter Roeck
     [not found]   ` <20190808192535.GA18697-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2019-08-08 19:33     ` Alex Deucher
     [not found]       ` <CADnq5_ONGvL0yMybsXCyYJO6zKRAi4aEPo8LwEwQjSP3aVbdJQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-08-09  9:04         ` Koenig, Christian

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