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From: takahiro.akashi@linaro.org (AKASHI Takahiro)
To: linux-arm-kernel@lists.infradead.org
Subject: Memory range end be inclusive or exclusive? Re: [PATCH v1 1/4] kexec: (bugfix) calc correct end address of memory ranges in device tree
Date: Tue, 6 Sep 2016 09:29:59 +0900	[thread overview]
Message-ID: <20160906002958.GB16712@linaro.org> (raw)
In-Reply-To: <20160801045240.GD7995@linaro.org>

Simon,

What is your opinion on this issue?

On Mon, Aug 01, 2016 at 01:52:40PM +0900, AKASHI Takahiro wrote:
> On Fri, Jul 29, 2016 at 06:23:56PM +0100, Russell King - ARM Linux wrote:
> > On Fri, Jul 29, 2016 at 10:12:26AM -0700, Geoff Levand wrote:
> > > On Fri, 2016-07-29 at 09:27 +0100, Russell King - ARM Linux wrote:
> > > 
> > > > So, these functions are a mess and need fixing.
> > > 
> > > Since this change isn't really related to arm64 support, I'll
> > > drop this patch from my series.
> > 
> > Do you have a case which triggers bugs in this code?
> 
> Actually, this patch was necessary when my kdump used "usable-memory"
> properties in "memory" nodes, as on ppc64, to limit the usable memory
> regions that can be used by crash dump kernel.
> Since then, I've moved to the approach of using "mem=" kernel parameter,
> then introducing a new property, "linux,usable-memory-range," under /chosen
> and now we don't need this patch any more.
> 
> So, we can drop it but I still believe that it is buggy.

Due to the discussions[1], I may want to re-enable "usable-memory"
property on arm64. In addition, I would like to add a function,
dtb_add_usable_memory_properties(), a variant of
add_usable_memory_properties(), to kexec/dt-ops.c.
So this issue is quite crucial now.

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-August/452685.html

-Takahiro AKASHI

> Thanks,
> -Takahiro AKASHI
> 
> > -- 
> > RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
> > FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
> > according to speedtest.net.

  reply	other threads:[~2016-09-06  0:29 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-19 23:28 [PATCH v1 0/4] arm64 kexec-tools patches Geoff Levand
2016-07-19 23:28 ` [PATCH v1 1/4] kexec: (bugfix) calc correct end address of memory ranges in device tree Geoff Levand
2016-07-27 22:45   ` Thiago Jung Bauermann
2016-07-27 23:23     ` Russell King - ARM Linux
2016-07-28 23:54       ` Thiago Jung Bauermann
2016-07-29  8:27         ` Russell King - ARM Linux
2016-07-29 17:12           ` Geoff Levand
2016-07-29 17:23             ` Russell King - ARM Linux
2016-08-01  4:52               ` AKASHI Takahiro
2016-09-06  0:29                 ` AKASHI Takahiro [this message]
2016-10-31  8:50                   ` Memory range end be inclusive or exclusive? " AKASHI Takahiro
2016-11-07  8:17                     ` Simon Horman
2016-07-19 23:28 ` [PATCH v1 2/4] kexec: Add common device tree routines Geoff Levand
2016-07-22  7:19   ` AKASHI Takahiro
2016-07-27 18:11     ` Geoff Levand
2016-07-19 23:28 ` [PATCH v1 4/4] arm64: Add support for binary image files Geoff Levand
2016-07-19 23:28 ` [PATCH v1 3/4] arm64: Add arm64 kexec support Geoff Levand
2016-07-20 15:39   ` Mark Rutland
2016-07-20 19:19     ` Geoff Levand
2016-07-21 10:31       ` Mark Rutland
2016-07-21 10:50         ` Robin Murphy
2016-07-21 21:49           ` Geoff Levand
2016-07-22  4:08             ` Pratyush Anand
2016-07-22  5:33               ` AKASHI Takahiro
2016-07-22  9:54               ` Mark Rutland
2016-07-22 10:03               ` Robin Murphy
2016-07-22 13:56                 ` Pratyush Anand
2016-07-22 17:59                   ` Robin Murphy
2016-07-25 21:56                 ` Geoff Levand
2016-07-20 17:53   ` Pratyush Anand
2016-07-20 20:33     ` Geoff Levand
2016-07-20 20:54   ` [PATCH v1.2 " Geoff Levand
2016-07-22  7:12     ` AKASHI Takahiro
2016-07-26  0:37       ` Geoff Levand
2016-07-25 14:28     ` Ruslan Bilovol
2016-07-25 20:50       ` Geoff Levand
2016-07-26  1:36         ` Ruslan Bilovol
2016-07-26  8:16           ` AKASHI Takahiro
2016-07-26 21:26             ` Ruslan Bilovol
2016-07-26 21:54               ` Geoff Levand
2016-07-20  4:30 ` [PATCH v1 0/4] arm64 kexec-tools patches AKASHI Takahiro
2016-07-26 23:05 ` Simon Horman
2016-07-27  5:57   ` AKASHI Takahiro
2016-07-28 18:09   ` Geoff Levand
2016-07-29  0:31     ` Simon Horman

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