+ reboot-x86-prepare-reboot_mode-for-moving-to-generic-kernel-code.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: reboot: x86, prepare reboot_mode for moving to generic kernel code
has been added to the -mm tree.  Its filename is
     reboot-x86-prepare-reboot_mode-for-moving-to-generic-kernel-code.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/SubmitChecklist when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Robin Holt <holt@sgi.com>
Subject: reboot: x86, prepare reboot_mode for moving to generic kernel code

Prepare for the moving the parsing of reboot= to the generic kernel code
by making reboot_mode into a more generic form.

Signed-off-by: Robin Holt <holt@sgi.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Russ Anderson <rja@sgi.com>
Cc: Robin Holt <holt@sgi.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/x86/kernel/reboot.c |   12 +++++++-----
 include/linux/reboot.h   |    5 +++++
 2 files changed, 12 insertions(+), 5 deletions(-)

diff -puN arch/x86/kernel/reboot.c~reboot-x86-prepare-reboot_mode-for-moving-to-generic-kernel-code arch/x86/kernel/reboot.c
--- a/arch/x86/kernel/reboot.c~reboot-x86-prepare-reboot_mode-for-moving-to-generic-kernel-code
+++ a/arch/x86/kernel/reboot.c
@@ -36,7 +36,7 @@ void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
 static const struct desc_ptr no_idt = {};
-static int reboot_mode;
+static enum reboot_mode reboot_mode = REBOOT_COLD;
 enum reboot_type reboot_type = BOOT_ACPI;
 int reboot_force;
 
@@ -88,11 +88,11 @@ static int __init reboot_setup(char *str
 
 		switch (*str) {
 		case 'w':
-			reboot_mode = 0x1234;
+			reboot_mode = REBOOT_WARM;
 			break;
 
 		case 'c':
-			reboot_mode = 0;
+			reboot_mode = REBOOT_COLD;
 			break;
 
 #ifdef CONFIG_SMP
@@ -536,6 +536,7 @@ static void native_machine_emergency_res
 	int i;
 	int attempt = 0;
 	int orig_reboot_type = reboot_type;
+	unsigned short mode;
 
 	if (reboot_emergency)
 		emergency_vmx_disable_all();
@@ -543,7 +544,8 @@ static void native_machine_emergency_res
 	tboot_shutdown(TB_SHUTDOWN_REBOOT);
 
 	/* Tell the BIOS if we want cold or warm reboot */
-	*((unsigned short *)__va(0x472)) = reboot_mode;
+	mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
+	*((unsigned short *)__va(0x472)) = mode;
 
 	for (;;) {
 		/* Could also try the reset bit in the Hammer NB */
@@ -585,7 +587,7 @@ static void native_machine_emergency_res
 
 		case BOOT_EFI:
 			if (efi_enabled(EFI_RUNTIME_SERVICES))
-				efi.reset_system(reboot_mode ?
+				efi.reset_system(reboot_mode == REBOOT_WARM ?
 						 EFI_RESET_WARM :
 						 EFI_RESET_COLD,
 						 EFI_SUCCESS, 0, NULL);
diff -puN include/linux/reboot.h~reboot-x86-prepare-reboot_mode-for-moving-to-generic-kernel-code include/linux/reboot.h
--- a/include/linux/reboot.h~reboot-x86-prepare-reboot_mode-for-moving-to-generic-kernel-code
+++ a/include/linux/reboot.h
@@ -10,6 +10,11 @@
 #define SYS_HALT	0x0002	/* Notify of system halt */
 #define SYS_POWER_OFF	0x0003	/* Notify of system power off */
 
+enum reboot_mode {
+	REBOOT_COLD = 0,
+	REBOOT_WARM,
+};
+
 extern int register_reboot_notifier(struct notifier_block *);
 extern int unregister_reboot_notifier(struct notifier_block *);
 
_

Patches currently in -mm which might be from holt@sgi.com are

origin.patch
mm-mmu_notifier-re-fix-freed-page-still-mapped-in-secondary-mmu.patch
mm-mmu_notifier-re-fix-freed-page-still-mapped-in-secondary-mmu-fix.patch
cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug.patch
migrate-shutdown-reboot-to-boot-cpu.patch
kernel-sysc-remove-stable-friendly-pf_thread_bound-define.patch
reboot-move-shutdown-reboot-related-functions-to-kernel-rebootc.patch
reboot-checkpatchpl-the-new-kernel-rebootc-file.patch
reboot-x86-prepare-reboot_mode-for-moving-to-generic-kernel-code.patch
reboot-unicore32-prepare-reboot_mode-for-moving-to-generic-kernel-code.patch
reboot-arm-remove-unused-restart_mode-fields-from-some-arm-subarchs.patch
reboot-arm-prepare-reboot_mode-for-moving-to-generic-kernel-code.patch
reboot-arm-change-reboot_mode-to-use-enum-reboot_mode.patch
reboot-move-arch-x86-reboot=-handling-to-generic-kernel.patch