X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fx86_64%2Fkernel%2Fsmp-xen.c;h=323c14215bf3b91f69a6e741eb67b28a1cdf6848;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=e1de0ab6e5928604436341b5c36e939901de9a51;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git

diff --git a/arch/x86_64/kernel/smp-xen.c b/arch/x86_64/kernel/smp-xen.c
index e1de0ab6e..323c14215 100644
--- a/arch/x86_64/kernel/smp-xen.c
+++ b/arch/x86_64/kernel/smp-xen.c
@@ -76,7 +76,7 @@ static DEFINE_PER_CPU(union smp_flush_state, flush_state);
  * We cannot call mmdrop() because we are in interrupt context, 
  * instead update mm->cpu_vm_mask.
  */
-static inline void leave_mm(unsigned long cpu)
+static inline void leave_mm(int cpu)
 {
 	if (read_pda(mmu_state) == TLBSTATE_OK)
 		BUG();
@@ -394,16 +394,20 @@ int smp_call_function_single (int cpu, void (*func) (void *info), void *info,
 	/* prevent preemption and reschedule on another processor */
 	int me = get_cpu();
 	if (cpu == me) {
-		WARN_ON(1);
 		put_cpu();
-		return -EBUSY;
+		return 0;
 	}
+
+	/* Can deadlock when called with interrupts disabled */
+	WARN_ON(irqs_disabled());
+
 	spin_lock_bh(&call_lock);
 	__smp_call_function_single(cpu, func, info, nonatomic, wait);
 	spin_unlock_bh(&call_lock);
 	put_cpu();
 	return 0;
 }
+EXPORT_SYMBOL(smp_call_function_single);
 
 /*
  * this function sends a 'generic call function' IPI to all other CPUs
@@ -485,7 +489,7 @@ void smp_stop_cpu(void)
 #ifndef CONFIG_XEN
 	disable_local_APIC();
 #endif
-	local_irq_restore(flags); 
+	local_irq_restore(flags);
 }
 
 static void smp_really_stop_cpu(void *dummy)
@@ -570,31 +574,3 @@ asmlinkage irqreturn_t smp_call_function_interrupt(void)
 	return IRQ_HANDLED;
 #endif
 }
-
-int safe_smp_processor_id(void)
-{
-#ifdef CONFIG_XEN
-	return smp_processor_id();
-#else
-	unsigned apicid, i;
-
-	if (disable_apic)
-		return 0;
-
-	apicid = hard_smp_processor_id();
-	if (apicid < NR_CPUS && x86_cpu_to_apicid[apicid] == apicid)
-		return apicid;
-
-	for (i = 0; i < NR_CPUS; ++i) {
-		if (x86_cpu_to_apicid[i] == apicid)
-			return i;
-	}
-
-	/* No entries in x86_cpu_to_apicid?  Either no MPS|ACPI,
-	 * or called too early.  Either way, we must be CPU 0. */
-      	if (x86_cpu_to_apicid[0] == BAD_APICID)
-		return 0;
-
-	return 0; /* Should not happen */
-#endif
-}