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From: james.morse@arm.com (James Morse)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v24 2/9] memblock: add memblock_cap_memory_range()
Date: Wed, 10 Aug 2016 17:26:44 +0100	[thread overview]
Message-ID: <57AB55C4.1070200@arm.com> (raw)
In-Reply-To: <20160809015526.28479-1-takahiro.akashi@linaro.org>

Hi Akashi,

On 09/08/16 02:55, AKASHI Takahiro wrote:
> Crash dump kernel uses only a limited range of memory as System RAM.
> On arm64 implementation, a new device tree property,
> "linux,usable-memory-range," is used to notify crash dump kernel of
> this range.[1]
> But simply excluding all the other regions, whatever their memory types
> are, doesn't work, especially, on the systems with ACPI. Since some of
> such regions will be later mapped as "device memory" by ioremap()/
> acpi_os_ioremap(), it can cause errors like unalignment accesses.[2]
> This issue is akin to the one reported in [3].
> 
> So this patch follows Chen's approach, and implements a new function,
> memblock_cap_memory_range(), which will exclude only the memory regions
> that are not marked "NOMAP" from memblock.memory.

This (and the next patch) fixes the acpi related unaligned access problem I had.
I've tested it on a Juno r1 and Seattle B0.

Tested-by: James Morse <james.morse@arm.com>


Thanks,

James

  reply	other threads:[~2016-08-10 16:26 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-09  1:52 [PATCH v24 0/9] arm64: add kdump support AKASHI Takahiro
2016-08-09  1:52 ` [PATCH v24 1/9] arm64: kdump: reserve memory for crash dump kernel AKASHI Takahiro
2016-08-09  1:55   ` [PATCH v24 2/9] memblock: add memblock_cap_memory_range() AKASHI Takahiro
2016-08-10 16:26     ` James Morse [this message]
2016-08-09  1:56   ` [PATCH v24 3/9] arm64: limit memory regions based on DT property, usable-memory-range AKASHI Takahiro
2016-08-09  1:56     ` [PATCH v24 4/9] arm64: kdump: implement machine_crash_shutdown() AKASHI Takahiro
2016-08-09  1:56     ` [PATCH v24 5/9] arm64: kdump: add kdump support AKASHI Takahiro
2016-08-10 16:38       ` James Morse
2016-08-10 18:18         ` Pratyush Anand
2016-08-11 10:03           ` Pratyush Anand
2016-08-16 10:13             ` James Morse
2016-08-17 15:33               ` [PATCH] fixup! " James Morse
2016-08-18  7:32                 ` AKASHI Takahiro
2016-08-19  8:00                 ` Pratyush Anand
2016-08-19 13:34                   ` James Morse
2016-08-19 15:19                     ` Pratyush Anand
2016-08-18  7:15         ` [PATCH v24 5/9] " AKASHI Takahiro
2016-08-18  7:19           ` Dave Young
2016-08-19  1:26           ` AKASHI Takahiro
2016-08-19 11:22             ` Pratyush Anand
2016-08-22  1:29               ` AKASHI Takahiro
2016-08-22  7:07                 ` Pratyush Anand
2016-08-22 13:47                 ` James Morse
2016-08-23  0:38                   ` AKASHI Takahiro
2016-08-23 11:23                     ` Pratyush Anand
2016-08-24  8:04                       ` Dave Young
2016-08-24 10:25                         ` James Morse
2016-08-25  1:04                           ` Dave Young
2016-08-19 13:28             ` James Morse
2016-08-22  1:23               ` AKASHI Takahiro
2016-08-24 14:44       ` Ard Biesheuvel
2016-08-26  6:22         ` AKASHI Takahiro
2016-08-09  1:56     ` [PATCH v24 6/9] arm64: kdump: add VMCOREINFO's for user-space coredump tools AKASHI Takahiro
2016-08-09  1:56     ` [PATCH v24 7/9] arm64: kdump: enable kdump in the arm64 defconfig AKASHI Takahiro
2016-08-09  1:56     ` [PATCH v24 8/9] arm64: kdump: update a kernel doc AKASHI Takahiro
2016-08-09  1:57   ` [PATCH v24 9/9] Documentation: dt: chosen properties for arm64 kdump AKASHI Takahiro
2016-08-19 13:26     ` Rob Herring
2016-08-22  4:28       ` AKASHI Takahiro
2016-08-30 16:34         ` Rob Herring
2016-08-30 23:45           ` AKASHI Takahiro
2016-08-31  5:02             ` AKASHI Takahiro
2016-09-02 10:11               ` AKASHI Takahiro
2016-09-27 23:39       ` Mark Rutland
2016-08-09  2:04 ` [PATCH v24 0/9] arm64: add kdump support AKASHI Takahiro
2016-08-31  3:41 ` Manish Jaggi
2016-08-31  5:31   ` AKASHI Takahiro
2016-09-02 12:53     ` Manish Jaggi
2016-09-05  8:15       ` AKASHI Takahiro
2016-09-05 12:42         ` Manish Jaggi
2016-09-06 15:33           ` Marc Zyngier
2016-09-06 16:15             ` Manish Jaggi
2016-09-06 16:42               ` Marc Zyngier

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