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

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Date:	Tue, 28 Jan 2014 00:02:15 -0800
From:	Olof Johansson <olof@...om.net>
To:	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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()

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.

Thanks,

-Olof
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