8 files changed, 107 insertions, 145 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 25dc4a0e7e48..75236f1972d9 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2681,9 +2681,17 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                         Run specified binary instead of /init from the ramdisk,
                         used for early userspace startup. See initrd.
 
-        reboot=         [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
-                        Format: <reboot_mode>[,<reboot_mode2>[,...]]
-                        See arch/*/kernel/reboot.c or arch/*/kernel/process.c
+        reboot=         [KNL]
+                        Format (x86 or x86_64):
+                                [w[arm] | c[old] | h[ard] | s[oft] | g[pio]] \
+                                [[,]s[mp]#### \
+                                [[,]b[ios] | a[cpi] | k[bd] | t[riple] | e[fi] | p[ci]] \
+                                [[,]f[orce]
+                        Where reboot_mode is one of warm (soft) or cold (hard) or gpio,
+                              reboot_type is one of bios, acpi, kbd, triple, efi, or pci,
+                              reboot_force is either force or not specified,
+                              reboot_cpu is s[mp]#### with #### being the processor
+                                        to be used for rebooting.
 
         relax_domain_level=
                         [KNL, SMP] Set scheduler's default relax_domain_level.
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index b7fdd864c839..d3ca4f6915af 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -176,16 +176,6 @@ void arch_cpu_idle(void)
                 default_idle();
 }
 
-enum reboot_mode reboot_mode = REBOOT_HARD;
-
-static int __init reboot_setup(char *str)
-{
-        if ('s' == str[0])
-                reboot_mode = REBOOT_SOFT;
-        return 1;
-}
-__setup("reboot=", reboot_setup);
-
 /*
  * Called by kexec, immediately prior to machine_kexec().
  *
diff --git a/arch/unicore32/kernel/process.c b/arch/unicore32/kernel/process.c
index 93dd035a8c33..778ebba80827 100644
--- a/arch/unicore32/kernel/process.c
+++ b/arch/unicore32/kernel/process.c
@@ -51,16 +51,6 @@ void arch_cpu_idle(void)
         local_irq_enable();
 }
 
-static enum reboot_mode reboot_mode = REBOOT_HARD;
-
-int __init reboot_setup(char *str)
-{
-        if ('s' == str[0])
-                reboot_mode = REBOOT_SOFT;
-        return 1;
-}
-__setup("reboot=", reboot_setup);
-
 void machine_halt(void)
 {
         gpio_set_value(GPO_SOFT_OFF, 0);
diff --git a/arch/x86/include/asm/emergency-restart.h b/arch/x86/include/asm/emergency-restart.h
index 75ce3f47d204..77a99ac06d00 100644
--- a/arch/x86/include/asm/emergency-restart.h
+++ b/arch/x86/include/asm/emergency-restart.h
@@ -1,18 +1,6 @@
 #ifndef _ASM_X86_EMERGENCY_RESTART_H
 #define _ASM_X86_EMERGENCY_RESTART_H
 
-enum reboot_type {
-        BOOT_TRIPLE = 't',
-        BOOT_KBD = 'k',
-        BOOT_BIOS = 'b',
-        BOOT_ACPI = 'a',
-        BOOT_EFI = 'e',
-        BOOT_CF9 = 'p',
-        BOOT_CF9_COND = 'q',
-};
-
-extern enum reboot_type reboot_type;
-
 extern void machine_emergency_restart(void);
 
 #endif /* _ASM_X86_EMERGENCY_RESTART_H */
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 39cc7f7acab3..63092afb142e 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -25,6 +25,7 @@
 #include <linux/kdebug.h>
 #include <linux/delay.h>
 #include <linux/crash_dump.h>
+#include <linux/reboot.h>
 
 #include <asm/uv/uv_mmrs.h>
 #include <asm/uv/uv_hub.h>
@@ -36,7 +37,6 @@
 #include <asm/ipi.h>
 #include <asm/smp.h>
 #include <asm/x86_init.h>
-#include <asm/emergency-restart.h>
 #include <asm/nmi.h>
 
 /* BMC sets a bit this MMR non-zero before sending an NMI */
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index f7703401d6cb..563ed91e6faa 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -36,22 +36,6 @@ void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
 static const struct desc_ptr no_idt = {};
-static enum reboot_mode reboot_mode;
-enum reboot_type reboot_type = BOOT_ACPI;
-int reboot_force;
-
-/*
- * This variable is used privately to keep track of whether or not
- * reboot_type is still set to its default value (i.e., reboot= hasn't
- * been set on the command line).  This is needed so that we can
- * suppress DMI scanning for reboot quirks.  Without it, it's
- * impossible to override a faulty reboot quirk without recompiling.
- */
-static int reboot_default = 1;
-
-#ifdef CONFIG_SMP
-static int reboot_cpu = -1;
-#endif
 
 /*
  * This is set if we need to go through the 'emergency' path.
@@ -64,79 +48,6 @@ static int reboot_emergency;
 bool port_cf9_safe = false;
 
 /*
- * reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
- * warm   Don't set the cold reboot flag
- * cold   Set the cold reboot flag
- * bios   Reboot by jumping through the BIOS
- * smp    Reboot by executing reset on BSP or other CPU
- * triple Force a triple fault (init)
- * kbd    Use the keyboard controller. cold reset (default)
- * acpi   Use the RESET_REG in the FADT
- * efi    Use efi reset_system runtime service
- * pci    Use the so-called "PCI reset register", CF9
- * force  Avoid anything that could hang.
- */
-static int __init reboot_setup(char *str)
-{
-        for (;;) {
-                /*
-                 * Having anything passed on the command line via
-                 * reboot= will cause us to disable DMI checking
-                 * below.
-                 */
-                reboot_default = 0;
-
-                switch (*str) {
-                case 'w':
-                        reboot_mode = REBOOT_WARM;
-                        break;
-
-                case 'c':
-                        reboot_mode = REBOOT_COLD;
-                        break;
-
-#ifdef CONFIG_SMP
-                case 's':
-                        if (isdigit(*(str+1))) {
-                                reboot_cpu = (int) (*(str+1) - '0');
-                                if (isdigit(*(str+2)))
-                                        reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
-                        }
-                        /*
-                         * We will leave sorting out the final value
-                         * when we are ready to reboot, since we might not
-                         * have detected BSP APIC ID or smp_num_cpu
-                         */
-                        break;
-#endif /* CONFIG_SMP */
-
-                case 'b':
-                case 'a':
-                case 'k':
-                case 't':
-                case 'e':
-                case 'p':
-                        reboot_type = *str;
-                        break;
-
-                case 'f':
-                        reboot_force = 1;
-                        break;
-                }
-
-                str = strchr(str, ',');
-                if (str)
-                        str++;
-                else
-                        break;
-        }
-        return 1;
-}
-
-__setup("reboot=", reboot_setup);
-
-
-/*
  * Reboot options and system auto-detection code provided by
  * Dell Inc. so their systems "just work". :-)
  */
@@ -616,26 +527,10 @@ void native_machine_shutdown(void)
 {
         /* Stop the cpus and apics */
 #ifdef CONFIG_SMP
-
-        /* The boot cpu is always logical cpu 0 */
-        int reboot_cpu_id = 0;
-
-        /* See if there has been given a command line override */
-        if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
-                cpu_online(reboot_cpu))
-                reboot_cpu_id = reboot_cpu;
-
-        /* Make certain the cpu I'm about to reboot on is online */
-        if (!cpu_online(reboot_cpu_id))
-                reboot_cpu_id = smp_processor_id();
-
-        /* Make certain I only run on the appropriate processor */
-        set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
-
         /*
-         * O.K Now that I'm on the appropriate processor, stop all of the
-         * others. Also disable the local irq to not receive the per-cpu
-         * timer interrupt which may trigger scheduler's load balance.
+         * Stop all of the others. Also disable the local irq to
+         * not receive the per-cpu timer interrupt which may trigger
+         * scheduler's load balance.
          */
         local_irq_disable();
         stop_other_cpus();
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 5a5d7f7e81b7..8e00f9f6f963 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -17,6 +17,23 @@ enum reboot_mode {
         REBOOT_SOFT,
         REBOOT_GPIO,
 };
+extern enum reboot_mode reboot_mode;
+
+enum reboot_type {
+        BOOT_TRIPLE = 't',
+        BOOT_KBD = 'k',
+        BOOT_BIOS = 'b',
+        BOOT_ACPI = 'a',
+        BOOT_EFI = 'e',
+        BOOT_CF9 = 'p',
+        BOOT_CF9_COND = 'q',
+};
+extern enum reboot_type reboot_type;
+
+extern int reboot_default;
+extern int reboot_cpu;
+extern int reboot_force;
+
 
 extern int register_reboot_notifier(struct notifier_block *);
 extern int unregister_reboot_notifier(struct notifier_block *);
diff --git a/kernel/reboot.c b/kernel/reboot.c
index abb6a0483716..269ed9384cc4 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -6,6 +6,7 @@
 
 #define pr_fmt(fmt)     "reboot: " fmt
 
+#include <linux/ctype.h>
 #include <linux/export.h>
 #include <linux/kexec.h>
 #include <linux/kmod.h>
@@ -24,6 +25,18 @@ int C_A_D = 1;
 struct pid *cad_pid;
 EXPORT_SYMBOL(cad_pid);
 
+#if defined(CONFIG_ARM) || defined(CONFIG_UNICORE32)
+#define DEFAULT_REBOOT_MODE             = REBOOT_HARD
+#else
+#define DEFAULT_REBOOT_MODE
+#endif
+enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;
+
+int reboot_default;
+int reboot_cpu;
+enum reboot_type reboot_type = BOOT_ACPI;
+int reboot_force;
+
 /*
  * If set, this is used for preparing the system to power off.
  */
@@ -87,7 +100,7 @@ EXPORT_SYMBOL(unregister_reboot_notifier);
 static void migrate_to_reboot_cpu(void)
 {
         /* The boot cpu is always logical cpu 0 */
-        int cpu = 0;
+        int cpu = reboot_cpu;
 
         cpu_hotplug_disable();
 
@@ -343,3 +356,64 @@ int orderly_poweroff(bool force)
         return 0;
 }
 EXPORT_SYMBOL_GPL(orderly_poweroff);
+
+static int __init reboot_setup(char *str)
+{
+        for (;;) {
+                /*
+                 * Having anything passed on the command line via
+                 * reboot= will cause us to disable DMI checking
+                 * below.
+                 */
+                reboot_default = 0;
+
+                switch (*str) {
+                case 'w':
+                        reboot_mode = REBOOT_WARM;
+                        break;
+
+                case 'c':
+                        reboot_mode = REBOOT_COLD;
+                        break;
+
+                case 'h':
+                        reboot_mode = REBOOT_HARD;
+                        break;
+
+                case 's':
+                        if (isdigit(*(str+1)))
+                                reboot_cpu = simple_strtoul(str+1, NULL, 0);
+                        else if (str[1] == 'm' && str[2] == 'p' &&
+                                                        isdigit(*(str+3)))
+                                reboot_cpu = simple_strtoul(str+3, NULL, 0);
+                        else
+                                reboot_mode = REBOOT_SOFT;
+                        break;
+
+                case 'g':
+                        reboot_mode = REBOOT_GPIO;
+                        break;
+
+                case 'b':
+                case 'a':
+                case 'k':
+                case 't':
+                case 'e':
+                case 'p':
+                        reboot_type = *str;
+                        break;
+
+                case 'f':
+                        reboot_force = 1;
+                        break;
+                }
+
+                str = strchr(str, ',');
+                if (str)
+                        str++;
+                else
+                        break;
+        }
+        return 1;
+}
+__setup("reboot=", reboot_setup);