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Date: Tue, 31 May 2022 21:04:12 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc: Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
Greg Ungerer <gerg@...ux-m68k.org>,
Joshua Thompson <funaho@...ai.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Sebastian Reichel <sre@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Greentime Hu <green.hu@...il.com>,
Vincent Chen <deanbo422@...il.com>,
"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
Helge Deller <deller@....de>,
Michael Ellerman <mpe@...erman.id.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
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Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Rich Felker <dalias@...c.org>,
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Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"the arch/x86 maintainers" <x86@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
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Ulf Hansson <ulf.hansson@...aro.org>,
Michał Mirosław <mirq-linux@...e.qmqm.pl>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-csky@...r.kernel.org,
"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
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linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v8 16/27] m68k: Switch to new sys-off handler API
Hi Dmitry,
On Tue, May 10, 2022 at 1:34 AM Dmitry Osipenko
<dmitry.osipenko@...labora.com> wrote:
> Kernel now supports chained power-off handlers. Use
> register_power_off_handler() that registers power-off handlers and
> do_kernel_power_off() that invokes chained power-off handlers. Legacy
> pm_power_off() will be removed once all drivers will be converted to
> the new sys-off API.
>
> Normally arch code should adopt only the do_kernel_power_off() at first,
> but m68k is a special case because it uses pm_power_off() "inside out",
> i.e. pm_power_off() invokes machine_power_off() [in fact it does nothing],
> while it's machine_power_off() that should invoke the pm_power_off(), and
> thus, we can't convert platforms to the new API separately. There are only
> two platforms changed here, so it's not a big deal.
>
> Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Reviewed-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Thanks for your patch, which is now commit f0f7e5265b3b37b0
("m68k: Switch to new sys-off handler API") upstream.
> --- a/arch/m68k/emu/natfeat.c
> +++ b/arch/m68k/emu/natfeat.c
> @@ -15,6 +15,7 @@
> #include <linux/string.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> +#include <linux/reboot.h>
> #include <linux/io.h>
> #include <asm/machdep.h>
> #include <asm/natfeat.h>
> @@ -90,5 +91,5 @@ void __init nf_init(void)
> pr_info("NatFeats found (%s, %lu.%lu)\n", buf, version >> 16,
> version & 0xffff);
>
> - mach_power_off = nf_poweroff;
> + register_platform_power_off(nf_poweroff);
Unfortunately nothing is registered, as this is called very early
(from setup_arch(), before the memory allocator is available.
Hence register_sys_off_handler() fails with -ENOMEM, and poweroff
stops working.
Possible solutions:
- As at most one handler can be registered,
register_platform_power_off() could use a static struct sys_off_handler
instance,
- Keep mach_power_off, and call register_platform_power_off() later.
Anything else?
Thanks!
> --- a/arch/m68k/mac/config.c
> +++ b/arch/m68k/mac/config.c
> @@ -12,6 +12,7 @@
>
> #include <linux/errno.h>
> #include <linux/module.h>
> +#include <linux/reboot.h>
> #include <linux/types.h>
> #include <linux/mm.h>
> #include <linux/tty.h>
> @@ -140,7 +141,6 @@ void __init config_mac(void)
> mach_hwclk = mac_hwclk;
> mach_reset = mac_reset;
> mach_halt = mac_poweroff;
> - mach_power_off = mac_poweroff;
> #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP)
> mach_beep = mac_mksound;
> #endif
> @@ -160,6 +160,8 @@ void __init config_mac(void)
>
> if (macintosh_config->ident == MAC_MODEL_IICI)
> mach_l2_flush = via_l2_flush;
> +
> + register_platform_power_off(mac_poweroff);
> }
This must have the same problem.
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
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