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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
Download patch file Download diff file Expand all files Collapse all files

8
kernel/panic.c
View file

@ -153,6 +153,8 @@ EXPORT_SYMBOL(panic);
* 'M' - System experienced a machine check exception.
* 'B' - System has hit bad_page.
* 'U' - Userspace-defined naughtiness.
* 'A' - ACPI table overridden.
* 'W' - Taint on warning.
*
* The string is overwritten by the next call to print_taint().
*/
@ -161,7 +163,7 @@ const char *print_tainted(void)
{
static char buf[20];
if (tainted) {
snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c",
snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c%c",
tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
@ -170,7 +172,8 @@ const char *print_tainted(void)
tainted & TAINT_BAD_PAGE ? 'B' : ' ',
tainted & TAINT_USER ? 'U' : ' ',
tainted & TAINT_DIE ? 'D' : ' ',
tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ');
tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ',
tainted & TAINT_WARN ? 'W' : ' ');
}
else
snprintf(buf, sizeof(buf), "Not tainted");
@ -312,6 +315,7 @@ void warn_on_slowpath(const char *file, int line)
print_modules();
dump_stack();
print_oops_end_marker();
add_taint(TAINT_WARN);
}
EXPORT_SYMBOL(warn_on_slowpath);
#endif