linux-kernel - Re: [PATCH 1/3] memblock, nobootmem: Add memblock_virt_alloc

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Date:	Tue, 28 Jan 2014 07:30:03 -0800
From:	Kevin Hilman <khilman@...aro.org>
To:	Olof Johansson <olof@...om.net>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 1/3] memblock, nobootmem: Add memblock_virt_alloc_low()

On Tue, Jan 28, 2014 at 12:02 AM, Olof Johansson <olof@...om.net> wrote:
> Hi,
>
> On Fri, Jan 24, 2014 at 11:11 AM, Yinghai Lu <yinghai@...nel.org> wrote:
>> The new memblock_virt APIs are used to replaced old bootmem API.
>>
>> We need to allocate page below 4G for swiotlb.
>>
>> That should fix regression on Andrew's system that is using swiotlb.
>>
>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>> Cc: Russell King <linux@....linux.org.uk>
>> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
>
> This seems to have been merged by Linus tonight as ad6492b80f, and it
> had fallout on ARM systems (boot failures with no console output on
> all but 5 of my machine/config combos).
>
> Seems like it didn't have a chance to sit in -next, which is somewhat
> understandable given that it's considered a bugfix and it indeed fixed
> the bug it was meant to.
>
> i'm out of time to debug this tonight (I noticed the failures as I was
> heading to bed and figured I'd at least bisect them), so I wouldn't
> mind seeing a revert of the ARM side change of ad6492b80f until it's
> been sorted out so we keep bisectabilty intact for the rest of the
> kernel.

Like Olof, I noticed multiple boot failures on various ARM boards.
I've confirmed that reverting the arch/arm part of this patch makes
them all happily booting again.

Kevin
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