From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 5/6] ARM, mm: change meaning of max_low_pfn to maximum pfn for nobootmem
Date: Mon, 25 Mar 2013 09:48:16 +0000 [thread overview]
Message-ID: <20130325094816.GO4977@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1364184674-13798-6-git-send-email-iamjoonsoo.kim@lge.com>
On Mon, Mar 25, 2013 at 01:11:13PM +0900, Joonsoo Kim wrote:
> nobootmem use max_low_pfn for computing boundary in free_all_bootmem()
> So we need proper value to max_low_pfn.
>
> But, there is some difficulty related to max_low_pfn. max_low_pfn is used
> for two meanings in various architectures. One is for number of pages
> in lowmem and the other is for maximum lowmem pfn. Now, in ARM, it is used
> as number of pages in lowmem. You can get more information in below link.
> http://lwn.net/Articles/543408/
> http://lwn.net/Articles/543424/
>
> As I investigated, architectures which use max_low_pfn as maximum pfn are
> more than others, so to change meaning of max_low_pfn to maximum pfn
> is preferable solution to me. This patch change max_low_pfn as maximum
> lowmem pfn in ARM. In addition, min_low_pfn, max_pfn is assigned according
> to this criteria.
>
> There is no real user for max_low_pfn except block/blk-setting.c and
> blk-setting.c assume that max_low_pfn is maximum lowmem pfn,
> so this patch may not harm anything.
This will need some very rigorous testing before it can go into mainline.
next prev parent reply other threads:[~2013-03-25 9:48 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-25 4:11 [RFC PATCH 0/6] ARM: use NO_BOOTMEM on default configuration Joonsoo Kim
2013-03-25 4:11 ` [RFC PATCH 1/6] ARM, TCM: initialize TCM in paging_init(), instead of setup_arch() Joonsoo Kim
2013-03-25 21:18 ` Linus Walleij
2013-03-25 4:11 ` [RFC PATCH 2/6] ARM, crashkernel: use ___alloc_bootmem_node_nopanic() for reserving memory Joonsoo Kim
2013-03-25 4:11 ` [RFC PATCH 3/6] ARM, crashkernel: correct total_mem size in reserve_crashkernel() Joonsoo Kim
2013-03-25 4:11 ` [RFC PATCH 4/6] ARM, mm: don't do arm_bootmem_init() if CONFIG_NO_BOOTMEM Joonsoo Kim
2013-03-25 4:11 ` [RFC PATCH 5/6] ARM, mm: change meaning of max_low_pfn to maximum pfn for nobootmem Joonsoo Kim
2013-03-25 9:48 ` Russell King - ARM Linux [this message]
2013-04-01 8:28 ` Joonsoo Kim
2013-07-01 14:14 ` Santosh Shilimkar
2013-07-01 17:09 ` Russell King - ARM Linux
2013-07-02 17:38 ` Santosh Shilimkar
2013-07-02 1:28 ` Joonsoo Kim
2013-03-25 4:11 ` [RFC PATCH 6/6] ARM, mm: enable NO_BOOTMEM for default ARM build Joonsoo Kim
2013-04-22 8:22 ` [RFC PATCH 0/6] ARM: use NO_BOOTMEM on default configuration Joonsoo Kim
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