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sched/idle: Fix arch_cpu_idle() vs tracing

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We call arch_cpu_idle() with RCU disabled, but then use
local_irq_{en,dis}able(), which invokes tracing, which relies on RCU.

Switch all arch_cpu_idle() implementations to use
raw_local_irq_{en,dis}able() and carefully manage the
lockdep,rcu,tracing state like we do in entry.

(XXX: we really should change arch_cpu_idle() to not return with
interrupts enabled)

Reported-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lkml.kernel.org/r/20201120114925.594122626@infradead.org
This commit is contained in:
Peter Zijlstra
2020-11-20 11:50:35 +01:00
parent 43be4388e9
commit 58c644ba51
23 changed files with 64 additions and 38 deletions
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4
arch/sparc/kernel/process_64.c
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@@ -62,11 +62,11 @@ void arch_cpu_idle(void)
{
if (tlb_type != hypervisor) {
touch_nmi_watchdog();
local_irq_enable();
raw_local_irq_enable();
} else {
unsigned long pstate;
local_irq_enable();
raw_local_irq_enable();
/* The sun4v sleeping code requires that we have PSTATE.IE cleared over
* the cpu sleep hypervisor call.