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>, Arnd Bergmann <arnd@arndb.de>,
"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>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 08/25] arch: introduce memremap()
Date: Wed, 29 Jul 2015 08:50:04 +0200 [thread overview]
Message-ID: <20150729065004.GA17162@lst.de> (raw)
In-Reply-To: <CAPcyv4jN6jYzw11qOOR-xd_w6s5dguQSoHyvmPFSWtL9S+tz3w@mail.gmail.com>
On Mon, Jul 27, 2015 at 04:26:03PM -0700, Dan Williams wrote:
> Oh, because all we have at this point is ioremap_cache() which
> silently falls back. It's not until the introduction of
> arch_memremp() where we update the arch code to break that behavior.
Ok, makes sense. Might be worth to document in the changelog.
> That said, I think it may be beneficial to allow a fallback if the
> user cares. So maybe memremap() can call plain ioremap() if
> MEMREMAP_STRICT is not set and none of the other mapping types are
> satisfied.
Is there a real use case for it? Fallback APIs always seem confusing
and it might make more sense to do this in the caller(s) that actually
need it.
next prev parent reply other threads:[~2015-07-29 6:50 UTC|newest]
Thread overview: 102+ 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 2:38 ` [PATCH v2 01/25] mm, x86: Fix warning in ioremap RAM check 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 ` [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 ` [PATCH v2 04/25] mm: enhance region_is_ram() to distinguish 'unknown' vs 'mixed' Dan Williams
2015-07-25 2:38 ` Dan Williams
2015-07-27 22:50 ` Luis R. Rodriguez
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 ` [PATCH v2 06/25] cleanup IORESOURCE_CACHEABLE vs ioremap() 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 ` [PATCH v2 08/25] arch: introduce memremap() 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 17:49 ` 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 23:26 ` Dan Williams
2015-07-29 6:50 ` Christoph Hellwig [this message]
2015-07-29 18:27 ` Luis R. Rodriguez
2015-07-29 18:33 ` Dan Williams
2015-07-29 21:00 ` Toshi Kani
2015-07-29 21:11 ` Toshi Kani
2015-07-29 21:43 ` Luis R. Rodriguez
2015-07-29 21:47 ` Dan Williams
2015-07-29 21:52 ` Luis R. Rodriguez
2015-07-30 0:00 ` Toshi Kani
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 22:52 ` Luis R. Rodriguez
2015-08-11 22:52 ` Luis R. Rodriguez
2015-08-11 23:13 ` Dan Williams
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 23:31 ` 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
2015-07-28 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 ` [PATCH v2 10/25] x86: " 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 2:39 ` [PATCH v2 12/25] i915: " 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
2015-07-25 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 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 ` [PATCH v2 15/25] memconsole: fix __iomem mishandling, switch to memremap Dan Williams
2015-07-25 2:39 ` Dan Williams
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 ` [PATCH v2 17/25] intel-iommu: " Dan Williams
2015-07-25 2:39 ` Dan Williams
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
2015-07-28 22:51 ` Ross Zwisler
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
2015-10-02 17:51 ` Brian Norris
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 ` [PATCH v2 21/25] fbdev: switch from ioremap_wt " Dan Williams
2015-07-25 2:40 ` [PATCH v2 22/25] pmem: " Dan Williams
2015-07-25 2:40 ` Dan Williams
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
2015-07-26 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
2015-07-26 17:31 ` Christoph Hellwig
2015-07-27 8:03 ` Christoph Hellwig
2015-07-29 22:21 ` Dan Williams
2015-07-29 22:21 ` Dan Williams
2015-07-25 2:40 ` [PATCH v2 25/25] pmem: convert to generic memremap Dan Williams
2015-07-25 2:40 ` Dan Williams
2015-07-26 17:33 ` Christoph Hellwig
2015-07-26 18:11 ` Dan Williams
2015-07-26 18:11 ` Dan Williams
2015-07-27 5:14 ` Christoph Hellwig
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