Commit c185ddec authored by Juergen Gross's avatar Juergen Gross
Browse files

xen/x86: fix cpu hotplug

Commit dc6416f1

 ("xen/x86: Call
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE) from xen_play_dead()")
introduced an error leading to a stack overflow of the idle task when
a cpu was brought offline/online many times: by calling
cpu_startup_entry() instead of returning at the end of xen_play_dead()
do_idle() would be entered again and again.

Don't use cpu_startup_entry(), but cpuhp_online_idle() instead allowing
to return from xen_play_dead().

Cc: <> # 4.12
Signed-off-by: default avatarJuergen Gross <>
Reviewed-by: default avatarBoris Ostrovsky <>
Signed-off-by: default avatarJuergen Gross <>
parent 29d11cfd
......@@ -19,6 +19,7 @@
#include <linux/irq_work.h>
#include <linux/tick.h>
#include <linux/nmi.h>
#include <linux/cpuhotplug.h>
#include <asm/paravirt.h>
#include <asm/desc.h>
......@@ -413,7 +414,7 @@ static void xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
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