summaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorZhizhou Zhang <zhizhouzhang@asrmicro.com>2018-06-12 12:07:37 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2018-06-19 16:19:24 +0300
commitb154886f7892499d0d3054026e19dfb9a731df61 (patch)
treeb6b747f8a056ef64bc9ed3c93108b7b21b4c0706 /arch
parentdd65a941f6ba473a5cb9d013d57fa43b48450a04 (diff)
downloadlinux-b154886f7892499d0d3054026e19dfb9a731df61.tar.xz
arm64: make secondary_start_kernel() notrace
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/kernel/smp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index f3e2e3aec0b0..2faa9863d2e5 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -179,7 +179,7 @@ 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)
{
u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
struct mm_struct *mm = &init_mm;