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bcb48185ed
The passed parameter to sysrq handlers is a key (a character). So change the type from 'int' to 'u8'. Let it specifically be 'u8' for two reasons: * unsigned: unsigned values come from the upper layers (devices) and the tty layer assumes unsigned on most places, and * 8-bit: as that what's supposed to be one day in all the layers built on the top of tty. (Currently, we use mostly 'unsigned char' and somewhere still only 'char'. (But that also translates to the former thanks to -funsigned-char.)) Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Cc: Richard Henderson <richard.henderson@linaro.org> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: "David S. Miller" <davem@davemloft.net> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: David Airlie <airlied@gmail.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Daniel Thompson <daniel.thompson@linaro.org> Cc: Douglas Anderson <dianders@chromium.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Len Brown <len.brown@intel.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: "Paul E. McKenney" <paulmck@kernel.org> Cc: Frederic Weisbecker <frederic@kernel.org> Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Zqiang <qiang.zhang1211@gmail.com> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> # DRM Acked-by: WANG Xuerui <git@xen0n.name> # loongarch Acked-by: Paul E. McKenney <paulmck@kernel.org> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Link: https://lore.kernel.org/r/20230712081811.29004-3-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
45 lines
991 B
C
45 lines
991 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* poweroff.c - sysrq handler to gracefully power down machine.
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*/
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#include <linux/kernel.h>
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#include <linux/sysrq.h>
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#include <linux/init.h>
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#include <linux/pm.h>
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#include <linux/workqueue.h>
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#include <linux/reboot.h>
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#include <linux/cpumask.h>
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/*
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* When the user hits Sys-Rq o to power down the machine this is the
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* callback we use.
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*/
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static void do_poweroff(struct work_struct *dummy)
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{
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kernel_power_off();
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}
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static DECLARE_WORK(poweroff_work, do_poweroff);
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static void handle_poweroff(u8 key)
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{
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/* run sysrq poweroff on boot cpu */
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schedule_work_on(cpumask_first(cpu_online_mask), &poweroff_work);
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}
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static const struct sysrq_key_op sysrq_poweroff_op = {
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.handler = handle_poweroff,
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.help_msg = "poweroff(o)",
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.action_msg = "Power Off",
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.enable_mask = SYSRQ_ENABLE_BOOT,
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};
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static int __init pm_sysrq_init(void)
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{
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register_sysrq_key('o', &sysrq_poweroff_op);
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return 0;
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}
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subsys_initcall(pm_sysrq_init);
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