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Taint kernel after WARN_ON(condition)

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The kernel is sent to tainted within the warn_on_slowpath() function, and
whenever a warning occurs the new taint flag 'W' is set.  This is useful to
know if a warning occurred before a BUG by preserving the warning as a flag
in the taint state.

This does not work on architectures where WARN_ON has its own definition.
These archs are:
	1. s390
	2. superh
	3. avr32
	4. parisc

The maintainers of these architectures have been added in the Cc: list
in this email to alert them to the situation.

The documentation in oops-tracing.txt has been updated to include the
new flag.

Signed-off-by: Nur Hussein <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: "Randy.Dunlap" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Kyle McMartin <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Haavard Skinnemoen <[email protected]>
Cc: Paul Mundt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nur Hussein 2008-04-29 00:58:39 -07:00 • committed by Linus Torvalds
commit 95b570c9ce
3 changed files with 11 additions and 2 deletions
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1
include/linux/kernel.h
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@ -255,6 +255,7 @@ extern enum system_states {
#define TAINT_USER (1<<6)
#define TAINT_DIE (1<<7)
#define TAINT_OVERRIDDEN_ACPI_TABLE (1<<8)
#define TAINT_WARN (1<<9)
extern void dump_stack(void) __cold;