Re: [PATCH 10/13] arch, mm: set high_memory in free_area_init()

Geert Uytterhoeven <[email protected]> Tue, 11 Mar 2025 22:41:28 +0100

Newsgroups	gmane.linux.ports.m68k,gmane.linux.ports.alpha,gmane.linux.kernel,gmane.linux.kernel.arc,gmane.linux.ports.arm.kernel,gmane.linux.ports.hexagon,gmane.linux.ports.mips,gmane.linux.ports.parisc,gmane.linux.ports.ppc64.devel,gmane.linux.ports.riscv,gmane.linux.ports.sh.devel,gmane.linux.ports.sparc,gmane.linux.uml.devel,gmane.linux.kernel.cross-arch,gmane.linux.kernel.mm
Message-ID	<CAMuHMdUGnBeo69NkYsv35YHp6H9GJSu-hoES2A8_0WhpX1zFhQ@mail.gmail.com>

Hi Mark,

On Tue, 11 Mar 2025 at 22:33, Mark Brown <[email protected]> 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@tuxmake) (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 -- [email protected]

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