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Commit 69361eef authored by Josh Hunt's avatar Josh Hunt Committed by Linus Torvalds
Browse files

panic: add TAINT_SOFTLOCKUP 



This taint flag will be set if the system has ever entered a softlockup
state.  Similar to TAINT_WARN it is useful to know whether or not the
system has been in a softlockup state when debugging.

[akpm@linux-foundation.org: apply the taint before calling panic()]
Signed-off-by: default avatarJosh Hunt <johunt@akamai.com>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1da85fdf

Documentation/oops-tracing.txt

+2 −0
Original line number Diff line number Diff line
@@ -268,6 +268,8 @@ characters, each representing a particular tainted value. 
 14: 'E' if an unsigned module has been loaded in a kernel supporting

     module signature.



 15: 'L' if a soft lockup has previously occurred on the system.



The primary reason for the 'Tainted: ' string is to tell kernel

debuggers if this is a clean kernel or if anything unusual has

occurred.  Tainting is permanent: even if an offending module is

Documentation/sysctl/kernel.txt

+1 −0
Original line number Diff line number Diff line
@@ -826,6 +826,7 @@ can be ORed together: 
4096 - An out-of-tree module has been loaded.

8192 - An unsigned module has been loaded in a kernel supporting module

       signature.

16384 - A soft lockup has previously occurred on the system.



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

include/linux/kernel.h

+1 −0
Original line number Diff line number Diff line
@@ -470,6 +470,7 @@ extern enum system_states { 
#define TAINT_FIRMWARE_WORKAROUND	11

#define TAINT_OOT_MODULE		12

#define TAINT_UNSIGNED_MODULE		13

#define TAINT_SOFTLOCKUP		14



extern const char hex_asc[];

#define hex_asc_lo(x)	hex_asc[((x) & 0x0f)]

kernel/panic.c

+1 −0
Original line number Diff line number Diff line
@@ -224,6 +224,7 @@ static const struct tnt tnts[] = { 
	{ TAINT_FIRMWARE_WORKAROUND,	'I', ' ' },

	{ TAINT_OOT_MODULE,		'O', ' ' },

	{ TAINT_UNSIGNED_MODULE,	'E', ' ' },

	{ TAINT_SOFTLOCKUP,		'L', ' ' },

};



/**

kernel/watchdog.c

+1 −0
Original line number Diff line number Diff line
@@ -368,6 +368,7 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer) 
			smp_mb__after_atomic();

		}



		add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK);

		if (softlockup_panic)

			panic("softlockup: hung tasks");

		__this_cpu_write(soft_watchdog_warn, true);