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Commit 3194904b authored by David Keitel's avatar David Keitel Committed by Matt Wagantall
Browse files

sysctl: add cold_boot sysctl entry 



Add a cold_boot parameter which supplements the
boot_reason sysctl entry with information about
whether the system was booted from cold or warm state.

/proc/sys/kernel/cold_boot entry is updated with 1 or 0 when
system was booted from cold or warm boot state respecitively.

CRs-Fixed: 461256
Change-Id: I2bc5d80c8f26eb9e9dbb4b34960d991a51a224e4
Signed-off-by: default avatarDavid Keitel <dkeitel@codeaurora.org>
[abhimany: fixup minor merge conflict and drop changes to
kernel/sysctl.c and Documentation since it was brought in via
snapshot commit]
Signed-off-by: default avatarAbhimanyu Kapur <abhimany@codeaurora.org>
parent 372d39f8

arch/arm/include/asm/processor.h

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#endif



extern unsigned int boot_reason;

extern unsigned int cold_boot;



struct debug_info {

#ifdef CONFIG_HAVE_HW_BREAKPOINT

arch/arm/kernel/setup.c

+3 −0
Original line number Diff line number Diff line
@@ -111,6 +111,9 @@ EXPORT_SYMBOL(arch_read_hardware_id); 
unsigned int boot_reason;

EXPORT_SYMBOL(boot_reason);



unsigned int cold_boot;

EXPORT_SYMBOL(cold_boot);



#ifdef MULTI_CPU

struct processor processor __read_mostly;

#endif

include/uapi/linux/sysctl.h

+1 −0
Original line number Diff line number Diff line
@@ -153,6 +153,7 @@ enum 
	KERN_MAX_LOCK_DEPTH=74, /* int: rtmutex's maximum lock depth */

	KERN_NMI_WATCHDOG=75, /* int: enable/disable nmi watchdog */

	KERN_PANIC_ON_NMI=76, /* int: whether we will panic on an unrecovered */

	KERN_COLD_BOOT = 78, /* int: identify if system cold booted */

};

kernel/sysctl_binary.c

+1 −0
Original line number Diff line number Diff line
@@ -138,6 +138,7 @@ static const struct bin_table bin_kern_table[] = { 
	{ CTL_INT,	KERN_MAX_LOCK_DEPTH,		"max_lock_depth" },

	{ CTL_INT,	KERN_PANIC_ON_NMI,		"panic_on_unrecovered_nmi" },

	{ CTL_INT,	KERN_BOOT_REASON,		"boot_reason" },

	{ CTL_INT,	KERN_COLD_BOOT,			"cold_boot" },

	{}

};