linux-kernel - Re: [PATCH 10/13] arch, mm: set high_memory in free_area

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Message-ID: <Z9Cl8JKkRGhaRrgM@kernel.org>
Date: Tue, 11 Mar 2025 23:06:56 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Andreas Larsson <andreas@...sler.com>,
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Subject: Re: [PATCH 10/13] arch, mm: set high_memory in free_area_init()

Hi Mark,

On Tue, Mar 11, 2025 at 05:51:06PM +0000, Mark Brown wrote:
> On Thu, Mar 06, 2025 at 08:51:20PM +0200, Mike Rapoport wrote:
> > From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> > 
> > high_memory defines upper bound on the directly mapped memory.
> > This bound is defined by the beginning of ZONE_HIGHMEM when a system has
> > high memory and by the end of memory otherwise.
> > 
> > All this is known to generic memory management initialization code that
> > can set high_memory while initializing core mm structures.
> > 
> > Remove per-architecture calculation of high_memory and add a generic
> > version to free_area_init().
> 
> This patch appears to be causing breakage on a number of 32 bit arm
> platforms, including qemu's virt-2.11,gic-version=3.  Affected platforms
> die on boot with no output, a bisect with qemu points at this commit and
> those for physical platforms appear to be converging on the same place.

Can you share how this can be reproduced with qemu?

-- 
Sincerely yours,
Mike.