From: Christoph Hellwig <hch@lst.de>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Christoph Hellwig <hch@lst.de>,
Dan Williams <dan.j.williams@intel.com>,
Arnd Bergmann <arnd@arndb.de>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Juergen Gross <jgross@suse.com>, X86 ML <x86@kernel.org>,
"Kani, Toshimitsu" <toshi.kani@hp.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Luis Rodriguez <mcgrof@suse.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Stefan Bader <stefan.bader@canonical.com>,
Andy Lutomirski <luto@amacapital.net>,
Linux MM <linux-mm@kvack.org>, Ralf Baechle <ralf@linux-mips.org>,
Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
Michael Ellerman <mpe@ellerman.id.au>, Tejun Heo <tj@kernel.org>,
Paul Mackerras <paulus@samba.org>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v5 2/6] arch: unify ioremap prototypes and macro aliases
Date: Wed, 1 Jul 2015 08:59:48 +0200 [thread overview]
Message-ID: <20150701065948.GA4355@lst.de> (raw)
In-Reply-To: <CAMuHMdUO4uSWH1Qc0SfDTLuXbiG2N9fq8Tf6j+3RoqVKdPugbA@mail.gmail.com>
On Wed, Jul 01, 2015 at 08:55:57AM +0200, Geert Uytterhoeven wrote:
> >
> > I think doing this at runtime might be a better idea. E.g. a
> > ioremap_flags with the CACHED argument will return -EOPNOTSUP unless
> > actually implemented. On various architectures different CPUs or
> > boards will have different capabilities in this area.
>
> So it would be the responsibility of the caller to fall back from
> ioremap(..., CACHED) to ioremap(..., UNCACHED)?
> I.e. all drivers using it should be changed...
All of the zero users we currently have will need to be changed, yes.
Note that I propose to leave ioremap(), aka ioremap_flags(..., 0) as
a default that always has to work, -EOPNOTSUP is only a valid return
value for non-default flaga.
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next prev parent reply other threads:[~2015-07-01 6:59 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-22 8:24 [PATCH v5 0/6] pmem api, generic ioremap_cache, and memremap Dan Williams
2015-06-22 8:24 ` [PATCH v5 1/6] arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead Dan Williams
2015-06-22 16:01 ` Christoph Hellwig
2015-06-22 8:24 ` [PATCH v5 2/6] arch: unify ioremap prototypes and macro aliases Dan Williams
2015-06-22 16:10 ` Christoph Hellwig
2015-06-22 17:12 ` Dan Williams
2015-06-23 10:07 ` Christoph Hellwig
2015-06-23 15:04 ` Dan Williams
2015-06-24 12:24 ` Christoph Hellwig
2015-06-30 22:57 ` Dan Williams
2015-07-01 6:23 ` Christoph Hellwig
2015-07-01 6:55 ` Geert Uytterhoeven
2015-07-01 6:59 ` Christoph Hellwig [this message]
2015-07-01 7:19 ` Geert Uytterhoeven
2015-07-01 7:28 ` Christoph Hellwig
2015-07-07 9:50 ` Luis R. Rodriguez
2015-07-07 10:13 ` Russell King - ARM Linux
2015-07-07 10:27 ` Geert Uytterhoeven
2015-07-07 16:07 ` Luis R. Rodriguez
2015-07-07 23:10 ` Toshi Kani
2015-07-09 1:40 ` Luis R. Rodriguez
2015-07-09 23:43 ` Toshi Kani
2015-07-01 8:09 ` Russell King - ARM Linux
2015-07-01 16:47 ` Dan Williams
2015-07-09 18:54 ` Luis R. Rodriguez
2015-06-22 8:24 ` [PATCH v5 3/6] cleanup IORESOURCE_CACHEABLE vs ioremap() Dan Williams
2015-06-22 8:24 ` [PATCH v5 4/6] devm: fix ioremap_cache() usage Dan Williams
2015-06-22 8:24 ` [PATCH v5 5/6] arch: introduce memremap_cache() and memremap_wt() Dan Williams
2015-06-22 8:24 ` [PATCH v5 6/6] arch, x86: pmem api for ensuring durability of persistent memory updates Dan Williams
2015-06-22 16:17 ` Christoph Hellwig
2015-06-22 17:51 ` Dan Williams
2015-06-23 10:09 ` Christoph Hellwig
2015-06-23 10:39 ` Richard Weinberger
2015-06-24 12:08 ` Christoph Hellwig
2015-06-24 12:35 ` Richard Weinberger
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