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

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Message-ID: <CAMuHMdUGnBeo69NkYsv35YHp6H9GJSu-hoES2A8_0WhpX1zFhQ@mail.gmail.com>
Date: Tue, 11 Mar 2025 22:41:28 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Mark Brown <broonie@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Alexander Gordeev <agordeev@...ux.ibm.com>, 
	Andreas Larsson <andreas@...sler.com>, Andy Lutomirski <luto@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
	Borislav Petkov <bp@...en8.de>, Brian Cain <bcain@...nel.org>, 
	Catalin Marinas <catalin.marinas@....com>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	"David S. Miller" <davem@...emloft.net>, Dinh Nguyen <dinguyen@...nel.org>, 
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>, Guo Ren <guoren@...nel.org>, 
	Heiko Carstens <hca@...ux.ibm.com>, Helge Deller <deller@....de>, Huacai Chen <chenhuacai@...nel.org>, 
	Ingo Molnar <mingo@...hat.com>, Jiaxun Yang <jiaxun.yang@...goat.com>, 
	Johannes Berg <johannes@...solutions.net>, 
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>, Madhavan Srinivasan <maddy@...ux.ibm.com>, 
	Matt Turner <mattst88@...il.com>, Max Filippov <jcmvbkbc@...il.com>, 
	Michael Ellerman <mpe@...erman.id.au>, Michal Simek <monstr@...str.eu>, 
	Palmer Dabbelt <palmer@...belt.com>, Peter Zijlstra <peterz@...radead.org>, 
	Richard Weinberger <richard@....at>, Russell King <linux@...linux.org.uk>, 
	Stafford Horne <shorne@...il.com>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
	Thomas Gleixner <tglx@...utronix.de>, Vasily Gorbik <gor@...ux.ibm.com>, Vineet Gupta <vgupta@...nel.org>, 
	Will Deacon <will@...nel.org>, linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-snps-arc@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
	linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org, 
	loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org, 
	linux-mips@...r.kernel.org, linux-openrisc@...r.kernel.org, 
	linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
	linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org, 
	linux-sh@...r.kernel.org, sparclinux@...r.kernel.org, 
	linux-um@...ts.infradead.org, linux-arch@...r.kernel.org, linux-mm@...ck.org, 
	x86@...nel.org, Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH 10/13] arch, mm: set high_memory in free_area_init()

Hi Mark,

On Tue, 11 Mar 2025 at 22:33, Mark Brown <broonie@...nel.org> wrote:
> On Tue, Mar 11, 2025 at 11:06:56PM +0200, Mike Rapoport wrote:
> > On Tue, Mar 11, 2025 at 05:51:06PM +0000, Mark Brown wrote:
> > > 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?
>
> https://lava.sirena.org.uk/scheduler/job/1184953
>
> Turns out it's actually producing output on qemu:
>
> [    0.000000] Booting Linux on physical CPU 0x0
> [    0.000000] Linux version 6.14.0-rc6-next-20250311 (tuxmake@...make) (arm-linux-gnueabihf-gcc (Debian 13.3.0-5) 13.3.0, GNU ld (GNU Binutils for Debian) 2.43.1) #1 SMP @1741691801
> [    0.000000] CPU: ARMv7 Processor [414fc0f0] revision 0 (ARMv7), cr=10c5387d
> [    0.000000] CPU: div instructions available: patching division code
> [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
> [    0.000000] OF: fdt: Machine model: linux,dummy-virt
> [    0.000000] random: crng init done
> [    0.000000] earlycon: pl11 at MMIO 0x09000000 (options '')
> [    0.000000] printk: legacy bootconsole [pl11] enabled
> [    0.000000] Memory policy: Data cache writealloc
> [    0.000000] efi: UEFI not found.
> [    0.000000] cma: Reserved 64 MiB at 0x00000000
>
> - I'd only been sampling the logs for the physical platforms, none of
> which had shown anything.

Hangs that early need "earlycon", which the qemu boot above does have.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds