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

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Message-ID: <20150312130635.GP8656@n2100.arm.linux.org.uk>
Date:	Thu, 12 Mar 2015 13:06:35 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stas Sergeev <stsp@...t.ru>
Cc:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	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

On Wed, Mar 11, 2015 at 06:22:42PM +0300, Stas Sergeev wrote:
> 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:

Correct, because the kernel can't see that physical memory.

If it tries to access the physical memory at those locations, it hits
the SoC registers and PCI instead of memory.

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