Re: [PATCH 04/36] cpuidle,intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE
From: Michel Lespinasse <hidden>
Date: 2022-07-25 19:49:24
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On Wed, Jun 08, 2022 at 04:27:27PM +0200, Peter Zijlstra wrote:
Commit c227233ad64c ("intel_idle: enable interrupts before C1 on
Xeons") wrecked intel_idle in two ways:
- must not have tracing in idle functions
- must return with IRQs disabled
Additionally, it added a branch for no good reason.
Fixes: c227233ad64c ("intel_idle: enable interrupts before C1 on Xeons")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>After this change was introduced, I am seeing "WARNING: suspicious RCU usage" when booting a kernel with debug options compiled in. Please see the attached dmesg output. The issue starts with commit 32d4fd5751ea and is still present in v5.19-rc8. I'm not sure, is this too late to fix or revert in v5.19 final ? Thanks, -- Michel "walken" Lespinasse