diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2023-05-12 23:07:24 +0200 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2023-05-15 13:44:54 +0200 |
| commit | 2de7fd26d90729c4e3430f9924b199dea810a9bc (patch) | |
| tree | 5569f93c08f06baf6241c96b0342c6b28b3abaf4 /arch/x86/xen/smp_pv.c | |
| parent | x86/smpboot: Remove wait for cpu_online() (diff) | |
| download | wireguard-linux-2de7fd26d90729c4e3430f9924b199dea810a9bc.tar.xz wireguard-linux-2de7fd26d90729c4e3430f9924b199dea810a9bc.zip | |
x86/xen/smp_pv: Remove wait for CPU online
Now that the core code drops sparse_irq_lock after the idle thread
synchronized, it's pointless to wait for the AP to mark itself online.
Whether the control CPU runs in a wait loop or sleeps in the core code
waiting for the online operation to complete makes no difference.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Tested-by: Helge Deller <deller@gmx.de> # parisc
Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> # Steam Deck
Link: https://lore.kernel.org/r/20230512205256.369512093@linutronix.de
Diffstat (limited to 'arch/x86/xen/smp_pv.c')
| -rw-r--r-- | arch/x86/xen/smp_pv.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c index a6f9128a4091..be40927667cf 100644 --- a/arch/x86/xen/smp_pv.c +++ b/arch/x86/xen/smp_pv.c @@ -340,11 +340,11 @@ static int xen_pv_cpu_up(unsigned int cpu, struct task_struct *idle) xen_pmu_init(cpu); - rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL); - BUG_ON(rc); - - while (cpu_report_state(cpu) != CPU_ONLINE) - HYPERVISOR_sched_op(SCHEDOP_yield, NULL); + /* + * Why is this a BUG? If the hypercall fails then everything can be + * rolled back, no? + */ + BUG_ON(HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL)); return 0; } |