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975b80702f
commitd1155e4132upstream. __setup() handlers should return 1 to obsolete_checksetup() in init/main.c to indicate that the boot option has been handled. A return of 0 causes the boot option/value to be listed as an Unknown kernel parameter and added to init's (limited) argument or environment strings. Also, error return codes don't mean anything to obsolete_checksetup() -- only non-zero (usually 1) or zero. So return 1 from nmi_debug_setup(). Fixes:1e1030dccb("sh: nmi_debug support.") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reported-by: Igor Zhbanov <izh1979@gmail.com> Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Cc: linux-sh@vger.kernel.org Cc: stable@vger.kernel.org Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Link: https://lore.kernel.org/r/20230306040037.20350-3-rdunlap@infradead.org Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Atmel Corporation
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*/
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#include <linux/delay.h>
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#include <linux/kdebug.h>
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#include <linux/notifier.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/hardirq.h>
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enum nmi_action {
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NMI_SHOW_STATE = 1 << 0,
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NMI_SHOW_REGS = 1 << 1,
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NMI_DIE = 1 << 2,
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NMI_DEBOUNCE = 1 << 3,
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};
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static unsigned long nmi_actions;
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static int nmi_debug_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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struct die_args *args = data;
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if (likely(val != DIE_NMI))
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return NOTIFY_DONE;
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if (nmi_actions & NMI_SHOW_STATE)
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show_state();
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if (nmi_actions & NMI_SHOW_REGS)
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show_regs(args->regs);
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if (nmi_actions & NMI_DEBOUNCE)
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mdelay(10);
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if (nmi_actions & NMI_DIE)
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return NOTIFY_BAD;
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return NOTIFY_OK;
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}
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static struct notifier_block nmi_debug_nb = {
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.notifier_call = nmi_debug_notify,
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};
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static int __init nmi_debug_setup(char *str)
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{
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char *p, *sep;
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register_die_notifier(&nmi_debug_nb);
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if (*str != '=')
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return 1;
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for (p = str + 1; *p; p = sep + 1) {
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sep = strchr(p, ',');
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if (sep)
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*sep = 0;
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if (strcmp(p, "state") == 0)
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nmi_actions |= NMI_SHOW_STATE;
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else if (strcmp(p, "regs") == 0)
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nmi_actions |= NMI_SHOW_REGS;
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else if (strcmp(p, "debounce") == 0)
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nmi_actions |= NMI_DEBOUNCE;
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else if (strcmp(p, "die") == 0)
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nmi_actions |= NMI_DIE;
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else
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printk(KERN_WARNING "NMI: Unrecognized action `%s'\n",
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p);
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if (!sep)
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break;
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}
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return 1;
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}
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__setup("nmi_debug", nmi_debug_setup);
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