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| author | Nicholas Piggin <npiggin@gmail.com> | 2022-01-24 17:39:28 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-01-25 08:50:10 +0300 |
| commit | 8defc2a5dd8f4c0cb19ecbaca8d3e89ab98524da (patch) | |
| tree | 78608ba49ddba38f09811bf36ebdd12534df8520 /tools/perf/scripts/python/stackcollapse.py | |
| parent | 22f7ff0dea9491e90b6fe808ed40c30bd791e5c2 (diff) | |
| download | linux-8defc2a5dd8f4c0cb19ecbaca8d3e89ab98524da.tar.xz | |
powerpc/64s/interrupt: Fix decrementer storm
The decrementer exception can fail to be cleared when the interrupt
returns in the case where the decrementer wraps with the next timer
still beyond decrementer_max. This results in a decrementer interrupt
storm. This is triggerable with small decrementer system with hard
and soft watchdogs disabled.
Fix this by always programming the decrementer if there was no timer.
Fixes: 0faf20a1ad16 ("powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use")
Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220124143930.3923442-1-npiggin@gmail.com
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
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