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| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-06 16:10:23 -0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-13 16:04:14 -0400 |
| commit | 3ef23111546df9e9dab2e2befb412a9563db0628 (patch) | |
| tree | ec72fa0e8d5d22a1390a486e1bf9308c4cbffd34 /arch/tile/include/asm/processor.h | |
| parent | 2f9ac29eec71a696cb0dcc5fb82c0f8d4dac28c9 (diff) | |
| download | lwn-3ef23111546df9e9dab2e2befb412a9563db0628.tar.gz lwn-3ef23111546df9e9dab2e2befb412a9563db0628.zip | |
tile: avoid recursive backtrace faults
This change adds support for avoiding recursive backtracer crashes;
we haven't seen this in practice other than when things are seriously
corrupt, but it may help avoid losing the root cause of a crash.
Also, don't abort kernel backtracers for invalid userspace PC's.
If we do, we lose the ability to backtrace through a userspace
call to a bad address above PAGE_OFFSET, even though that it can
be perfectly reasonable to continue the backtrace in such a case.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/include/asm/processor.h')
| -rw-r--r-- | arch/tile/include/asm/processor.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h index cda27243fb09..fed1c044fec8 100644 --- a/arch/tile/include/asm/processor.h +++ b/arch/tile/include/asm/processor.h @@ -110,6 +110,8 @@ struct thread_struct { unsigned long long interrupt_mask; /* User interrupt-control 0 state */ unsigned long intctrl_0; + /* Is this task currently doing a backtrace? */ + bool in_backtrace; #if CHIP_HAS_PROC_STATUS_SPR() /* Any other miscellaneous processor state bits */ unsigned long proc_status; |