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Commit 381adf36 authored by David Keitel's avatar David Keitel Committed by David Collins
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>
parent ea449ffe

Documentation/sysctl/kernel.txt

+11 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ show up in /proc/sys/kernel: 
- boot_reason		     [ ARM only ]

- callhome		     [ S390 only ]

- cap_last_cap

- cold_boot		     [ ARM only ]

- core_pattern

- core_pipe_limit

- core_uses_pid
@@ -198,6 +199,16 @@ cap_last_cap 
Highest valid capability of the running kernel.  Exports

CAP_LAST_CAP from the kernel.



===============================================================



cold_boot



ARM -- indicator for system cold boot



A single bit will be set in the unsigned integer value to identify

whether the device was booted from a cold or warm state. Zero

indicating a warm boot and one indicating a cold boot.



==============================================================



core_pattern:

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
@@ -119,6 +119,9 @@ 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 __ro_after_init;

#endif

include/uapi/linux/sysctl.h

+1 −0
Original line number Diff line number Diff line
@@ -153,6 +153,7 @@ enum 
	KERN_PANIC_ON_NMI=76, /* int: whether we will panic on an unrecovered */

	KERN_PANIC_ON_WARN=77, /* int: call panic() in WARN() functions */

	KERN_BOOT_REASON=78, /* int: identify reason system was booted */

	KERN_COLD_BOOT=79, /* int: identify if system cold booted */

};

kernel/sysctl.c

+9 −1
Original line number Diff line number Diff line
@@ -1406,6 +1406,14 @@ static struct ctl_table kern_table[] = { 
		.mode		= 0444,

		.proc_handler	= proc_dointvec,

	},



	{

		.procname	= "cold_boot",

		.data		= &cold_boot,

		.maxlen		= sizeof(int),

		.mode		= 0444,

		.proc_handler	= proc_dointvec,

	},

#endif

	{ }

};