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Message-ID: <20230512205256.423407127@linutronix.de>
Date: Fri, 12 May 2023 23:07:25 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org, David Woodhouse <dwmw2@...radead.org>,
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"Guilherme G. Piccoli" <gpiccoli@...lia.com>,
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Ross Philipson <ross.philipson@...cle.com>
Subject: [patch V4 18/37] x86/xen/hvm: Get rid of DEAD_FROZEN handling
From: Thomas Gleixner <tglx@...utronix.de>
No point in this conditional voodoo. Un-initializing the lock mechanism is
safe to be called unconditionally even if it was already invoked when the
CPU died.
Remove the invocation of xen_smp_intr_free() as that has been already
cleaned up in xen_cpu_dead_hvm().
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Michael Kelley <mikelley@...rosoft.com>
---
arch/x86/xen/enlighten_hvm.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
--- a/arch/x86/xen/enlighten_hvm.c
+++ b/arch/x86/xen/enlighten_hvm.c
@@ -161,13 +161,12 @@ static int xen_cpu_up_prepare_hvm(unsign
int rc = 0;
/*
- * This can happen if CPU was offlined earlier and
- * offlining timed out in common_cpu_die().
+ * If a CPU was offlined earlier and offlining timed out then the
+ * lock mechanism is still initialized. Uninit it unconditionally
+ * as it's safe to call even if already uninited. Interrupts and
+ * timer have already been handled in xen_cpu_dead_hvm().
*/
- if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
- xen_smp_intr_free(cpu);
- xen_uninit_lock_cpu(cpu);
- }
+ xen_uninit_lock_cpu(cpu);
if (cpu_acpi_id(cpu) != U32_MAX)
per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
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