diff mbox series

[08/19] xen/arm: Add rcu_barrier() before enabling non-boot CPUs on resume

Message ID a90d2b9a33dbdc90f2548757bdd4173e1d711d36.1665137247.git.mykyta_poturai@epam.com (mailing list archive)
State New, archived
Headers show
Series [01/19] xen/arm: Implement PSCI system suspend | expand

Commit Message

Mykyta Poturai Oct. 7, 2022, 10:32 a.m. UTC 
From: Mirela Simonovic <mirela.simonovic@aggios.com>

The rcu_barrier() has to be added to ensure that the per cpu area is
freed before a non-boot CPU tries to initialize it (_free_percpu_area()
has to be called before the init_percpu_area()). This scenario occurs
when non-boot CPUs are hot-unplugged on suspend and hotplugged on resume.

Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com>
Signed-off-by: Saeed Nowshadi <saeed.nowshadi@xilinx.com>
---
 xen/arch/arm/suspend.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/xen/arch/arm/suspend.c b/xen/arch/arm/suspend.c
index 0784979e4f..0c16cfc750 100644
--- a/xen/arch/arm/suspend.c
+++ b/xen/arch/arm/suspend.c
@@ -153,6 +153,7 @@  static long system_suspend(void *data)
     system_state = SYS_STATE_resume;
 
 resume_nonboot_cpus:
+    rcu_barrier();
     enable_nonboot_cpus();
     thaw_domains();
     system_state = SYS_STATE_active;