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| author | Zhizhou Zhang <zhizhouzhang@asrmicro.com> | 2018-06-12 17:07:37 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-24 13:09:01 +0200 |
| commit | d22240dd6ab34a69d8e6f07fd74bd53270b554fa (patch) | |
| tree | 6beda83af485b01cc15c6e777a08686e56344a06 | |
| parent | a929f067a88f0f9a2b02e328f746007f645fa920 (diff) | |
| download | linux-d22240dd6ab34a69d8e6f07fd74bd53270b554fa.tar.gz | |
arm64: make secondary_start_kernel() notrace
[ Upstream commit b154886f7892499d0d3054026e19dfb9a731df61 ]
We can't call function trace hook before setup percpu offset.
When entering secondary_start_kernel(), percpu offset has not
been initialized. So this lead hotplug malfunction.
Here is the flow to reproduce this bug:
echo 0 > /sys/devices/system/cpu/cpu1/online
echo function > /sys/kernel/debug/tracing/current_tracer
echo 1 > /sys/kernel/debug/tracing/tracing_on
echo 1 > /sys/devices/system/cpu/cpu1/online
Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Zhizhou Zhang <zhizhouzhang@asrmicro.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/arm64/kernel/smp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 9f7195a5773ee..b7ad41d7b6eea 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -214,7 +214,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle) * This is the secondary CPU boot entry. We're using this CPUs * idle thread stack, but a set of temporary page tables. */ -asmlinkage void secondary_start_kernel(void) +asmlinkage notrace void secondary_start_kernel(void) { struct mm_struct *mm = &init_mm; unsigned int cpu; |