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Commit 0e1e6dd9 authored by Abhimanyu Kapur's avatar Abhimanyu Kapur
Browse files

arm64: smp: Jump back to secondary start kernel for onlined CPUs 



Add a call to secondary start kernel for cpus which have been
onlined via the hotplug path for wfi based hotplug solution
where the return path from cpu_die should not return to the
idle thread. Update the cpu_die definition with a __ref to
allow referencing a __cpuinit call (secondary_start_kernel)
from it.

Change-Id: I7c083effda3928b562ea0d601833ceb8d5178d43
Signed-off-by: default avatarAbhimanyu Kapur <abhimany@codeaurora.org>
parent c92e3648

arch/arm64/kernel/smp.c

+11 −2
Original line number Diff line number Diff line
@@ -244,7 +244,7 @@ void __cpu_die(unsigned int cpu) 
 * of the other hotplug-cpu capable cores, so presumably coming

 * out of idle fixes this.

 */

void cpu_die(void)

void __ref cpu_die(void)

{

	unsigned int cpu = smp_processor_id();
@@ -262,7 +262,16 @@ void cpu_die(void) 
	 */

	cpu_ops[cpu]->cpu_die(cpu);



	BUG();

	/*

	 * Do not return to the idle loop - jump back to the secondary

	 * cpu initialisation.  There's some initialisation which needs

	 * to be repeated to undo the effects of taking the CPU offline.

	 */



	asm volatile("mov       sp, %0\n"

		     "mov       x29, #0\n"

		     "b         secondary_start_kernel"

		     : : "r" (task_stack_page(current) + THREAD_START_SP));

}

#endif