The patch titled
Subject: panic: add TAINT_SOFTLOCKUP
has been added to the -mm tree. Its filename is
panic-add-taint_softlockup.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/panic-add-taint_softlockup.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/panic-add-taint_softlockup.patch
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*** 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: Josh Hunt <johunt@xxxxxxxxxx>
Subject: 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.
Signed-off-by: Josh Hunt <johunt@xxxxxxxxxx>
Cc: Jason Baron <jbaron@xxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/oops-tracing.txt | 2 ++
Documentation/sysctl/kernel.txt | 1 +
include/linux/kernel.h | 1 +
kernel/panic.c | 1 +
kernel/watchdog.c | 1 +
5 files changed, 6 insertions(+)
diff -puN Documentation/oops-tracing.txt~panic-add-taint_softlockup Documentation/oops-tracing.txt
--- a/Documentation/oops-tracing.txt~panic-add-taint_softlockup
+++ a/Documentation/oops-tracing.txt
@@ -268,6 +268,8 @@ characters, each representing a particul
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
diff -puN Documentation/sysctl/kernel.txt~panic-add-taint_softlockup Documentation/sysctl/kernel.txt
--- a/Documentation/sysctl/kernel.txt~panic-add-taint_softlockup
+++ a/Documentation/sysctl/kernel.txt
@@ -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.
==============================================================
diff -puN include/linux/kernel.h~panic-add-taint_softlockup include/linux/kernel.h
--- a/include/linux/kernel.h~panic-add-taint_softlockup
+++ a/include/linux/kernel.h
@@ -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)]
diff -puN kernel/panic.c~panic-add-taint_softlockup kernel/panic.c
--- a/kernel/panic.c~panic-add-taint_softlockup
+++ a/kernel/panic.c
@@ -224,6 +224,7 @@ static const struct tnt tnts[] = {
{ TAINT_FIRMWARE_WORKAROUND, 'I', ' ' },
{ TAINT_OOT_MODULE, 'O', ' ' },
{ TAINT_UNSIGNED_MODULE, 'E', ' ' },
+ { TAINT_SOFTLOCKUP, 'L', ' ' },
};
/**
diff -puN kernel/watchdog.c~panic-add-taint_softlockup kernel/watchdog.c
--- a/kernel/watchdog.c~panic-add-taint_softlockup
+++ a/kernel/watchdog.c
@@ -370,6 +370,7 @@ static enum hrtimer_restart watchdog_tim
if (softlockup_panic)
panic("softlockup: hung tasks");
+ add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK);
__this_cpu_write(soft_watchdog_warn, true);
} else
__this_cpu_write(soft_watchdog_warn, false);
_
Patches currently in -mm which might be from johunt@xxxxxxxxxx are
block-restore-proc-partitions-to-not-display-non-partitionable-removable-devices.patch
panic-add-taint_softlockup.patch
panic-add-taint_softlockup-fix.patch
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