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| author | Juergen Gross <jgross@suse.com> | 2017-07-05 16:05:20 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2017-07-23 08:13:11 +0200 |
| commit | c185ddec54657c145a0c2055e4b87918da24974f (patch) | |
| tree | 534b075a9ed9871aed3983cfaa86c7111310b69d | |
| parent | 29d11cfd8698038b87458ba4d1329b9da81150a5 (diff) | |
| download | linux-c185ddec54657c145a0c2055e4b87918da24974f.tar.bz2 | |
xen/x86: fix cpu hotplug
Commit dc6416f1d711eb4c1726e845d653235dcaae12e1 ("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: <stable@vger.kernel.org> # 4.12
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
| -rw-r--r-- | arch/x86/xen/smp_pv.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c index 1ea598e5f030..51471408fdd1 100644 --- a/arch/x86/xen/smp_pv.c +++ b/arch/x86/xen/smp_pv.c @@ -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 */ */ tick_nohz_idle_enter(); - cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); + cpuhp_online_idle(CPUHP_AP_ONLINE_IDLE); } #else /* !CONFIG_HOTPLUG_CPU */ |