linux-kernel - Re: [PATCH] n_tty: use kmalloc() instead of vmalloc() to avoid crash on armada-xp

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Date:	Wed, 11 Mar 2015 18:22:42 +0300
From:	Stas Sergeev <stsp@...t.ru>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Linux kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] n_tty: use kmalloc() instead of vmalloc() to avoid crash
 on armada-xp

11.03.2015 18:13, Gregory CLEMENT пишет:
> On 11/03/2015 16:01, Stas Sergeev wrote:
>> 11.03.2015 16:14, Russell King - ARM Linux пишет:
>>> On Wed, Mar 11, 2015 at 01:44:57PM +0100, Gregory CLEMENT wrote:
>>>> Hi Stas,
>>>>
>>>> On 10/03/2015 17:54, Stas Sergeev wrote:
>>>>> Hello, the patch below is needed for a successful boot on armada-xp.
>>>>>
>>>> I am really surprised by this patch because I used the Armada XP based
>>>> board in a daily base and I never saw this issue.
>>> Can you provide some details about your board - does it have 8GB of
>>> memory, ranging from 0-0xf0000000, and 4G-8G ?
>> I wonder about this 256Mb memory hole.
> This is where the SoC registers are.
OK but it seems I am loosing this region of _physical_ memory:
---

[    0.000000]  memory size = 0x1f0000000
[    0.000000]  memory.cnt  = 0x2
[    0.000000]  memory[0x0]     [0x00000000000000-0x000000efffffff],
0xf0000000 bytes
[    0.000000]  memory[0x1]     [0x00000100000000-0x000001ffffffff],
0x100000000 bytes

---

As you can see, memory size is 0x1f0000000 instead of 0x20000000.
Why 256Mb are lost?
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