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author | Valentin Schneider <valentin.schneider@arm.com> | 2021-05-12 11:46:36 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2021-05-12 13:01:45 +0200 |
commit | f1a0a376ca0c4ef1fc3d24e3e502acbb5b795674 (patch) | |
tree | 591f2066a33afd8327ce2476705c105a65979f18 /arch/sh/kernel/smp.c | |
parent | kselftest: Add test for core sched prctl interface (diff) | |
download | linux-f1a0a376ca0c4ef1fc3d24e3e502acbb5b795674.tar.xz linux-f1a0a376ca0c4ef1fc3d24e3e502acbb5b795674.zip |
sched/core: Initialize the idle task with preemption disabled
As pointed out by commit
de9b8f5dcbd9 ("sched: Fix crash trying to dequeue/enqueue the idle thread")
init_idle() can and will be invoked more than once on the same idle
task. At boot time, it is invoked for the boot CPU thread by
sched_init(). Then smp_init() creates the threads for all the secondary
CPUs and invokes init_idle() on them.
As the hotplug machinery brings the secondaries to life, it will issue
calls to idle_thread_get(), which itself invokes init_idle() yet again.
In this case it's invoked twice more per secondary: at _cpu_up(), and at
bringup_cpu().
Given smp_init() already initializes the idle tasks for all *possible*
CPUs, no further initialization should be required. Now, removing
init_idle() from idle_thread_get() exposes some interesting expectations
with regards to the idle task's preempt_count: the secondary startup always
issues a preempt_disable(), requiring some reset of the preempt count to 0
between hot-unplug and hotplug, which is currently served by
idle_thread_get() -> idle_init().
Given the idle task is supposed to have preemption disabled once and never
see it re-enabled, it seems that what we actually want is to initialize its
preempt_count to PREEMPT_DISABLED and leave it there. Do that, and remove
init_idle() from idle_thread_get().
Secondary startups were patched via coccinelle:
@begone@
@@
-preempt_disable();
...
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210512094636.2958515-1-valentin.schneider@arm.com
Diffstat (limited to 'arch/sh/kernel/smp.c')
-rw-r--r-- | arch/sh/kernel/smp.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c index 372acdc9033e..65924d9ec245 100644 --- a/arch/sh/kernel/smp.c +++ b/arch/sh/kernel/smp.c @@ -186,8 +186,6 @@ asmlinkage void start_secondary(void) per_cpu_trap_init(); - preempt_disable(); - notify_cpu_starting(cpu); local_irq_enable(); |