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From: Larry Bassel <lbassel@codeaurora.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org,
	Russell King - ARM Linux <linux@arm.linux.org.uk>,
	Nicolas Pitre <nico@fluxnic.net>
Subject: Re: how can I cleanly exclude memory from the kernel memory allocator?
Date: Tue, 19 Apr 2011 16:33:36 -0700	[thread overview]
Message-ID: <20110419233336.GF29359@labbmf-linux.qualcomm.com> (raw)
In-Reply-To: <20110325202755.GA13574@n2100.arm.linux.org.uk>

On 25 Mar 11 20:27, Russell King - ARM Linux wrote:
> On Fri, Mar 25, 2011 at 10:39:28AM -0700, Larry Bassel wrote:
> > OK, please ignore my previous mail, I see that .fixup can be
> > used to adjust tags. It appears to me, however, that using a
> > .reserve function calling memblock_reserve will be an
> > easier way of doing what I need.
> 
> Absolutely.

Hopefully I'm just missing something obvious, but
when I call memblock_reserve (in .38) to reserve a block
of memory away from the general kernel memory pool,
I find that an ioremap of memory within the reserved block
still fails because pte_valid() is apparently true.

Is this intended behavior? If so, what would the
correct way of separating memory from the system be
so that there is no longer a 1-to-1 1M mapping for
this memory and ioremap (creating the *only* mapping
for this memory) is allowed?

Thanks.

Larry

> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

WARNING: multiple messages have this Message-ID (diff)
From: lbassel@codeaurora.org (Larry Bassel)
To: linux-arm-kernel@lists.infradead.org
Subject: how can I cleanly exclude memory from the kernel memory allocator?
Date: Tue, 19 Apr 2011 16:33:36 -0700	[thread overview]
Message-ID: <20110419233336.GF29359@labbmf-linux.qualcomm.com> (raw)
In-Reply-To: <20110325202755.GA13574@n2100.arm.linux.org.uk>

On 25 Mar 11 20:27, Russell King - ARM Linux wrote:
> On Fri, Mar 25, 2011 at 10:39:28AM -0700, Larry Bassel wrote:
> > OK, please ignore my previous mail, I see that .fixup can be
> > used to adjust tags. It appears to me, however, that using a
> > .reserve function calling memblock_reserve will be an
> > easier way of doing what I need.
> 
> Absolutely.

Hopefully I'm just missing something obvious, but
when I call memblock_reserve (in .38) to reserve a block
of memory away from the general kernel memory pool,
I find that an ioremap of memory within the reserved block
still fails because pte_valid() is apparently true.

Is this intended behavior? If so, what would the
correct way of separating memory from the system be
so that there is no longer a 1-to-1 1M mapping for
this memory and ioremap (creating the *only* mapping
for this memory) is allowed?

Thanks.

Larry

> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

  reply	other threads:[~2011-04-19 23:33 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-24 22:18 how can I cleanly exclude memory from the kernel memory allocator? Larry Bassel
2011-03-24 22:18 ` Larry Bassel
2011-03-24 23:14 ` Colin Cross
2011-03-24 23:14   ` Colin Cross
2011-03-25 17:37   ` Larry Bassel
2011-03-25 17:37     ` Larry Bassel
2011-03-24 23:27 ` Nicolas Pitre
2011-03-24 23:27   ` Nicolas Pitre
2011-03-25 15:28   ` Larry Bassel
2011-03-25 15:28     ` Larry Bassel
2011-03-25 17:39   ` Larry Bassel
2011-03-25 17:39     ` Larry Bassel
2011-03-25 20:27     ` Russell King - ARM Linux
2011-03-25 20:27       ` Russell King - ARM Linux
2011-04-19 23:33       ` Larry Bassel [this message]
2011-04-19 23:33         ` Larry Bassel
2011-04-19 23:40         ` Larry Bassel
2011-04-19 23:40           ` Larry Bassel
2011-04-20  6:48         ` Colin Cross
2011-04-20  6:48           ` Colin Cross
2011-04-20 19:22           ` Larry Bassel
2011-04-20 19:22             ` Larry Bassel

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