ppc: apply fix for hard lockup#652
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ojeda merged 2 commits intoRust-for-Linux:rustfrom Jan 27, 2022
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…ndlers unless perf is in use"" This reverts commit 827556e. This is done in order to use the actual fix that will appear in -rc2. Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
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: 0faf20a ("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: Miguel Ojeda <ojeda@kernel.org>
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Revert the revert and apply the fix to be in line with mainline.
See https://lore.kernel.org/linuxppc-dev/CANiq72n_FmDx=r-o9J8gYc6LpwRL5EGmhM6Xzwv27Xc7h1TNDw@mail.gmail.com/ for details.