From: Christoph Hellwig <hch@lst.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Christoph Hellwig <hch@lst.de>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
linux-arch@vger.kernel.org, "Kani,
Toshimitsu" <toshi.kani@hp.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Russell King <rmk+kernel@arm.linux.org.uk>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 25/25] pmem: convert to generic memremap
Date: Mon, 27 Jul 2015 07:14:13 +0200 [thread overview]
Message-ID: <20150727051413.GC15836@lst.de> (raw)
In-Reply-To: <CAPcyv4jsnQ1CzgXkkpzJnfjnKMmxiwyhQ_3osgo9vmjceP+rZA@mail.gmail.com>
On Sun, Jul 26, 2015 at 11:11:44AM -0700, Dan Williams wrote:
> I don't follow. We have __iomem for the cpu mapping of a resource and
> dma_map() for a PCI device. __pmem works the same and is there to
> make sure someone doesn't simply de-reference a pointer to pmem and
> hope that the write is persistent.
But no deference of a kernel pointer is magily persistent, so I'm
not really worried about that. It just means whenever we want to
pass it to anything we'll need to cast. And anything that does
I/O falls into that category.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Christoph Hellwig <hch@lst.de>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
linux-arch@vger.kernel.org, "Kani,
Toshimitsu" <toshi.kani@hp.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Russell King <rmk+kernel@arm.linux.org.uk>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 25/25] pmem: convert to generic memremap
Date: Mon, 27 Jul 2015 07:14:13 +0200 [thread overview]
Message-ID: <20150727051413.GC15836@lst.de> (raw)
In-Reply-To: <CAPcyv4jsnQ1CzgXkkpzJnfjnKMmxiwyhQ_3osgo9vmjceP+rZA@mail.gmail.com>
On Sun, Jul 26, 2015 at 11:11:44AM -0700, Dan Williams wrote:
> I don't follow. We have __iomem for the cpu mapping of a resource and
> dma_map() for a PCI device. __pmem works the same and is there to
> make sure someone doesn't simply de-reference a pointer to pmem and
> hope that the write is persistent.
But no deference of a kernel pointer is magily persistent, so I'm
not really worried about that. It just means whenever we want to
pass it to anything we'll need to cast. And anything that does
I/O falls into that category.
WARNING: multiple messages have this Message-ID (diff)
From: hch@lst.de (Christoph Hellwig)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 25/25] pmem: convert to generic memremap
Date: Mon, 27 Jul 2015 07:14:13 +0200 [thread overview]
Message-ID: <20150727051413.GC15836@lst.de> (raw)
In-Reply-To: <CAPcyv4jsnQ1CzgXkkpzJnfjnKMmxiwyhQ_3osgo9vmjceP+rZA@mail.gmail.com>
On Sun, Jul 26, 2015 at 11:11:44AM -0700, Dan Williams wrote:
> I don't follow. We have __iomem for the cpu mapping of a resource and
> dma_map() for a PCI device. __pmem works the same and is there to
> make sure someone doesn't simply de-reference a pointer to pmem and
> hope that the write is persistent.
But no deference of a kernel pointer is magily persistent, so I'm
not really worried about that. It just means whenever we want to
pass it to anything we'll need to cast. And anything that does
I/O falls into that category.
next prev parent reply other threads:[~2015-07-27 5:14 UTC|newest]
Thread overview: 208+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-25 2:37 [PATCH v2 00/25] replace ioremap_{cache|wt} with memremap Dan Williams
2015-07-25 2:37 ` Dan Williams
2015-07-25 2:37 ` Dan Williams
2015-07-25 2:37 ` Dan Williams
2015-07-25 2:37 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 01/25] mm, x86: Fix warning in ioremap RAM check Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 02/25] mm, x86: Remove region_is_ram() call from ioremap Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 03/25] mm: Fix bugs in region_is_ram() Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 04/25] mm: enhance region_is_ram() to distinguish 'unknown' vs 'mixed' Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-27 22:50 ` Luis R. Rodriguez
2015-07-27 22:50 ` Luis R. Rodriguez
2015-07-27 22:50 ` Luis R. Rodriguez
2015-07-28 21:33 ` Toshi Kani
2015-07-28 21:33 ` Toshi Kani
2015-07-28 21:33 ` Toshi Kani
2015-07-25 2:38 ` [PATCH v2 05/25] arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 06/25] cleanup IORESOURCE_CACHEABLE vs ioremap() Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 07/25] intel_iommu: fix leaked ioremap mapping Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 08/25] arch: introduce memremap() Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-26 17:25 ` Christoph Hellwig
2015-07-26 17:25 ` Christoph Hellwig
2015-07-26 17:25 ` Christoph Hellwig
2015-07-26 17:49 ` Dan Williams
2015-07-26 17:49 ` Dan Williams
2015-07-26 17:49 ` Dan Williams
2015-07-27 5:12 ` Christoph Hellwig
2015-07-27 5:12 ` Christoph Hellwig
2015-07-27 5:12 ` Christoph Hellwig
2015-07-27 5:12 ` Christoph Hellwig
2015-07-27 5:12 ` Christoph Hellwig
2015-07-27 5:12 ` Christoph Hellwig
2015-07-27 23:26 ` Dan Williams
2015-07-27 23:26 ` Dan Williams
2015-07-27 23:26 ` Dan Williams
2015-07-29 6:50 ` Christoph Hellwig
2015-07-29 6:50 ` Christoph Hellwig
2015-07-29 6:50 ` Christoph Hellwig
2015-07-29 18:27 ` Luis R. Rodriguez
2015-07-29 18:27 ` Luis R. Rodriguez
2015-07-29 18:27 ` Luis R. Rodriguez
2015-07-29 18:33 ` Dan Williams
2015-07-29 18:33 ` Dan Williams
2015-07-29 18:33 ` Dan Williams
2015-07-29 21:00 ` Toshi Kani
2015-07-29 21:00 ` Toshi Kani
2015-07-29 21:00 ` Toshi Kani
2015-07-29 21:11 ` Toshi Kani
2015-07-29 21:11 ` Toshi Kani
2015-07-29 21:11 ` Toshi Kani
2015-07-29 21:43 ` Luis R. Rodriguez
2015-07-29 21:43 ` Luis R. Rodriguez
2015-07-29 21:43 ` Luis R. Rodriguez
2015-07-29 21:47 ` Dan Williams
2015-07-29 21:47 ` Dan Williams
2015-07-29 21:47 ` Dan Williams
2015-07-29 21:52 ` Luis R. Rodriguez
2015-07-29 21:52 ` Luis R. Rodriguez
2015-07-29 21:52 ` Luis R. Rodriguez
2015-07-30 0:00 ` Toshi Kani
2015-07-30 0:00 ` Toshi Kani
2015-07-30 0:00 ` Toshi Kani
2015-08-11 21:30 ` Luis R. Rodriguez
2015-08-11 21:30 ` Luis R. Rodriguez
2015-08-11 21:30 ` Luis R. Rodriguez
2015-08-11 22:40 ` Toshi Kani
2015-08-11 22:40 ` Toshi Kani
2015-08-11 22:40 ` Toshi Kani
2015-08-11 22:52 ` Luis R. Rodriguez
2015-08-11 22:52 ` Luis R. Rodriguez
2015-08-11 22:52 ` Luis R. Rodriguez
2015-08-11 23:13 ` Dan Williams
2015-08-11 23:13 ` Dan Williams
2015-08-11 23:13 ` Dan Williams
2016-04-21 12:47 ` Luis R. Rodriguez
2016-04-21 12:47 ` Luis R. Rodriguez
2016-04-21 12:47 ` Luis R. Rodriguez
2016-04-21 12:47 ` Luis R. Rodriguez
2015-07-27 23:17 ` Luis R. Rodriguez
2015-07-27 23:17 ` Luis R. Rodriguez
2015-07-27 23:17 ` Luis R. Rodriguez
2015-07-27 23:31 ` Dan Williams
2015-07-27 23:31 ` Dan Williams
2015-07-27 23:31 ` Dan Williams
2015-07-27 23:31 ` Dan Williams
2015-07-27 23:43 ` Luis R. Rodriguez
2015-07-27 23:43 ` Luis R. Rodriguez
2015-07-27 23:43 ` Luis R. Rodriguez
2015-07-28 0:32 ` Dan Williams
2015-07-28 0:32 ` Dan Williams
2015-07-28 0:32 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 09/25] arm: switch from ioremap_cache to memremap Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 10/25] x86: " Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` [PATCH v2 11/25] gma500: switch from acpi_os_ioremap to ioremap Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-25 2:39 ` [PATCH v2 12/25] i915: " Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-27 7:50 ` [Intel-gfx] " Daniel Vetter
2015-07-27 7:50 ` Daniel Vetter
2015-07-27 7:50 ` Daniel Vetter
2015-07-27 7:50 ` Daniel Vetter
2015-07-25 2:39 ` [PATCH v2 13/25] acpi: switch from ioremap_cache to memremap Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 23:55 ` Rafael J. Wysocki
2015-07-25 23:55 ` Rafael J. Wysocki
2015-07-25 23:55 ` Rafael J. Wysocki
2015-07-25 2:39 ` [PATCH v2 14/25] toshiba laptop: replace ioremap_cache with ioremap Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` [PATCH v2 15/25] memconsole: fix __iomem mishandling, switch to memremap Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 22:02 ` Sergei Shtylyov
2015-07-25 22:02 ` Sergei Shtylyov
2015-07-25 22:02 ` Sergei Shtylyov
2015-07-25 2:39 ` [PATCH v2 16/25] visorbus: switch from ioremap_cache " Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` [PATCH v2 17/25] intel-iommu: " Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-08-03 14:27 ` Joerg Roedel
2015-08-03 14:27 ` Joerg Roedel
2015-08-03 14:27 ` Joerg Roedel
2015-07-25 2:39 ` [PATCH v2 18/25] libnvdimm, pmem: " Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-28 22:51 ` Ross Zwisler
2015-07-28 22:51 ` Ross Zwisler
2015-07-28 22:51 ` Ross Zwisler
2015-07-28 23:06 ` Dan Williams
2015-07-28 23:06 ` Dan Williams
2015-07-28 23:06 ` Dan Williams
2015-07-25 2:39 ` [PATCH v2 19/25] pxa2xx-flash: " Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-10-02 17:51 ` Brian Norris
2015-10-02 17:51 ` Brian Norris
2015-10-02 17:51 ` Brian Norris
2015-10-09 21:33 ` Dan Williams
2015-10-09 21:33 ` Dan Williams
2015-10-09 21:33 ` Dan Williams
2015-07-25 2:39 ` [PATCH v2 20/25] sfi: " Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` [PATCH v2 21/25] fbdev: switch from ioremap_wt " Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:39 ` Dan Williams
2015-07-25 2:40 ` [PATCH v2 22/25] pmem: " Dan Williams
2015-07-25 2:40 ` Dan Williams
2015-07-25 2:40 ` Dan Williams
2015-07-29 19:12 ` Ross Zwisler
2015-07-29 19:12 ` Ross Zwisler
2015-07-29 19:12 ` Ross Zwisler
2015-07-25 2:40 ` [PATCH v2 23/25] arch: remove ioremap_cache, replace with arch_memremap Dan Williams
2015-07-25 2:40 ` Dan Williams
2015-07-25 2:40 ` Dan Williams
2015-07-26 17:31 ` Christoph Hellwig
2015-07-26 17:31 ` Christoph Hellwig
2015-07-26 17:31 ` Christoph Hellwig
2015-07-25 2:40 ` [PATCH v2 24/25] arch: remove ioremap_wt, " Dan Williams
2015-07-25 2:40 ` Dan Williams
2015-07-25 2:40 ` Dan Williams
2015-07-26 17:31 ` Christoph Hellwig
2015-07-26 17:31 ` Christoph Hellwig
2015-07-26 17:31 ` Christoph Hellwig
2015-07-27 8:03 ` Christoph Hellwig
2015-07-27 8:03 ` Christoph Hellwig
2015-07-27 8:03 ` Christoph Hellwig
2015-07-29 22:21 ` Dan Williams
2015-07-29 22:21 ` Dan Williams
2015-07-29 22:21 ` Dan Williams
2015-07-25 2:40 ` [PATCH v2 25/25] pmem: convert to generic memremap Dan Williams
2015-07-25 2:40 ` Dan Williams
2015-07-25 2:40 ` Dan Williams
2015-07-26 17:33 ` Christoph Hellwig
2015-07-26 17:33 ` Christoph Hellwig
2015-07-26 17:33 ` Christoph Hellwig
2015-07-26 18:11 ` Dan Williams
2015-07-26 18:11 ` Dan Williams
2015-07-26 18:11 ` Dan Williams
2015-07-27 5:14 ` Christoph Hellwig [this message]
2015-07-27 5:14 ` Christoph Hellwig
2015-07-27 5:14 ` Christoph Hellwig
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