Taint kernel after WARN_ON(condition)
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 <nurhussein@gmail.com> Cc: Arjan van de Ven <arjan@infradead.org> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -253,6 +253,10 @@ characters, each representing a particular tainted value.
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8: 'D' if the kernel has died recently, i.e. there was an OOPS or BUG.
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9: 'A' if the ACPI table has been overridden.
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10: 'W' if a warning has previously been issued by the kernel.
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The primary reason for the 'Tainted: ' string is to tell kernel
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debuggers if this is a clean kernel or if anything unusual has
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occurred. Tainting is permanent: even if an offending module is
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@ -255,6 +255,7 @@ extern enum system_states {
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#define TAINT_USER (1<<6)
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#define TAINT_DIE (1<<7)
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#define TAINT_OVERRIDDEN_ACPI_TABLE (1<<8)
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#define TAINT_WARN (1<<9)
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extern void dump_stack(void) __cold;
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@ -153,6 +153,8 @@ EXPORT_SYMBOL(panic);
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* 'M' - System experienced a machine check exception.
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* 'B' - System has hit bad_page.
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* 'U' - Userspace-defined naughtiness.
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* 'A' - ACPI table overridden.
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* 'W' - Taint on warning.
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*
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* The string is overwritten by the next call to print_taint().
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*/
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@ -161,7 +163,7 @@ const char *print_tainted(void)
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{
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static char buf[20];
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if (tainted) {
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snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c",
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snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c%c",
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tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
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tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
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tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
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@ -170,7 +172,8 @@ const char *print_tainted(void)
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tainted & TAINT_BAD_PAGE ? 'B' : ' ',
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tainted & TAINT_USER ? 'U' : ' ',
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tainted & TAINT_DIE ? 'D' : ' ',
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tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ');
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tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ',
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tainted & TAINT_WARN ? 'W' : ' ');
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}
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else
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snprintf(buf, sizeof(buf), "Not tainted");
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@ -312,6 +315,7 @@ void warn_on_slowpath(const char *file, int line)
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print_modules();
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dump_stack();
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print_oops_end_marker();
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add_taint(TAINT_WARN);
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}
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EXPORT_SYMBOL(warn_on_slowpath);
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#endif
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