From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Russell King <linux@arm.linux.org.uk>,
Will Deacon <will.deacon@arm.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Nicolas Pitre <nico@linaro.org>
Subject: Re: [RFC PATCH 5/6] ARM, mm: change meaning of max_low_pfn to maximum pfn for nobootmem
Date: Tue, 2 Jul 2013 10:28:19 +0900 [thread overview]
Message-ID: <20130702012819.GA31505@lge.com> (raw)
In-Reply-To: <51D18ED5.50103@ti.com>
On Mon, Jul 01, 2013 at 10:14:45AM -0400, Santosh Shilimkar wrote:
> Joonsoo,
>
> On Monday 25 March 2013 12:11 AM, 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.
> >
> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> >
> I have been also carrying similar patch as yours in an attempt
> to make LPAE kernel work on ARM. Your patch carries better
> description, so will your version and include in my series
> which I plan to post on the list after some more testing.
> Will copy you. The changes are very similar to your series.
Okay!
Thanks.
>
> Regards,
> Santosh
>
>
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next prev parent reply other threads:[~2013-07-02 1:28 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
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 [this message]
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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