From: Thomas Gleixner <tglx@linutronix.de>
To: Toshi Kani <toshi.kani@hp.com>
Cc: hpa@zytor.com, mingo@redhat.com, akpm@linux-foundation.org,
arnd@arndb.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
x86@kernel.org, linux-nvdimm@ml01.01.org, jgross@suse.com,
stefan.bader@canonical.com, luto@amacapital.net, hmh@hmh.eng.br,
yigal@plexistor.com, konrad.wilk@oracle.com, Elliott@hp.com,
mcgrof@suse.com, hch@lst.de
Subject: Re: [PATCH v9 3/10] x86, asm: Change is_new_memtype_allowed() for WT
Date: Fri, 22 May 2015 09:02:39 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.11.1505220901380.5457@nanos> (raw)
In-Reply-To: <1431551151-19124-4-git-send-email-toshi.kani@hp.com>
On Wed, 13 May 2015, Toshi Kani wrote:
> __ioremap_caller() calls reserve_memtype() to set new_pcm
> (existing map type if any), and then calls
> is_new_memtype_allowed() to verify if converting to new_pcm
> is allowed when pcm (request type) is different from new_pcm.
>
> When WT is requested, the caller expects that writes are
> ordered and uncached. Therefore, this patch changes
> is_new_memtype_allowed() to disallow the following cases.
>
> - If the request is WT, mapping type cannot be WB
> - If the request is WT, mapping type cannot be WC
>
> Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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next prev parent reply other threads:[~2015-05-22 7:02 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-13 21:05 [PATCH v9 0/10] Support Write-Through mapping on x86 Toshi Kani
2015-05-13 21:05 ` [PATCH v9 1/10] x86, mm, pat: Set WT to PA7 slot of PAT MSR Toshi Kani
2015-05-22 6:55 ` Thomas Gleixner
2015-05-13 21:05 ` [PATCH v9 2/10] x86, mm, pat: Change reserve_memtype() for WT Toshi Kani
2015-05-22 7:01 ` Thomas Gleixner
2015-05-13 21:05 ` [PATCH v9 3/10] x86, asm: Change is_new_memtype_allowed() " Toshi Kani
2015-05-22 7:02 ` Thomas Gleixner [this message]
2015-05-13 21:05 ` [PATCH v9 4/10] x86, mm, asm-gen: Add ioremap_wt() " Toshi Kani
2015-05-22 7:08 ` Thomas Gleixner
2015-05-13 21:05 ` [PATCH v9 5/10] arch/*/asm/io.h: Add ioremap_wt() to all architectures Toshi Kani
2015-05-22 7:15 ` Thomas Gleixner
2015-05-22 14:08 ` Toshi Kani
2015-05-13 21:05 ` [PATCH v9 6/10] x86, mm, pat: Add pgprot_writethrough() for WT Toshi Kani
2015-05-22 7:16 ` Thomas Gleixner
2015-05-13 21:05 ` [PATCH v9 7/10] x86, mm, asm: Add WT support to set_page_memtype() Toshi Kani
2015-05-22 7:35 ` Thomas Gleixner
2015-05-22 15:04 ` Toshi Kani
2015-05-13 21:05 ` [PATCH v9 8/10] x86, mm: Add set_memory_wt() for WT Toshi Kani
2015-05-22 7:48 ` Thomas Gleixner
2015-05-22 15:30 ` Toshi Kani
2015-05-13 21:05 ` [PATCH v9 9/10] x86, mm, pat: Refactor !pat_enabled handling Toshi Kani
2015-05-22 8:34 ` Thomas Gleixner
2015-05-22 16:27 ` Toshi Kani
2015-05-13 21:05 ` [PATCH v9 10/10] drivers/block/pmem: Map NVDIMM with ioremap_wt() Toshi Kani
2015-05-14 21:52 ` Dan Williams
2015-05-14 22:20 ` Toshi Kani
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