Before kernel 2.6.24, smp_call_function_mask() is not defined for architecture
x86_64 and not for architecture i386.
This patch defines it in external-module-compat.h to emulate it for older
kernel, it uses codes from arch/x86/kernel/smp_64.c modified to call
smp_call_single_function() (like in previous version of KVM) instead of
send_IPI_mask().
Signed-off-by: Laurent Vivier <[EMAIL PROTECTED]>
---
kernel/external-module-compat.h | 75 +++++++++++++++++++++++++++++++++++++++
1 files changed, 75 insertions(+), 0 deletions(-)
diff --git a/kernel/external-module-compat.h b/kernel/external-module-compat.h
index bd637db..adc5cd4 100644
--- a/kernel/external-module-compat.h
+++ b/kernel/external-module-compat.h
@@ -421,3 +421,78 @@ typedef _Bool bool;
#ifndef PF_VCPU
#define PF_VCPU 0
#endif
+
+/*
+ * smp_call_function_mask() is not defined/exported below 2.6.24
+ */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
+struct kvm_call_data_struct {
+ void (*func) (void *info);
+ void *info;
+ atomic_t started;
+ atomic_t finished;
+ int wait;
+};
+
+static void kvm_ack_smp_call(void *_data)
+{
+ struct kvm_call_data_struct *data = _data;
+ /* if wait == 0, data can be out of scope
+ * after atomic_inc(info->started)
+ */
+ void (*func) (void *info) = data->func;
+ void *info = data->info;
+ int wait = data->wait;
+
+ smp_mb();
+ atomic_inc(&data->started);
+ (*func)(info);
+ if (wait) {
+ smp_mb();
+ atomic_inc(&data->finished);
+ }
+}
+
+static inline int smp_call_function_mask(cpumask_t mask,
+ void (*func) (void *info), void *info, int wait)
+{
+ struct kvm_call_data_struct data;
+ cpumask_t allbutself;
+ int cpus;
+ int cpu;
+
+ allbutself = cpu_online_map;
+ cpu_clear(smp_processor_id(), allbutself);
+
+ cpus_and(mask, mask, allbutself);
+ cpus = cpus_weight(mask);
+
+ if (!cpus)
+ return 0;
+
+ data.func = func;
+ data.info = info;
+ atomic_set(&data.started, 0);
+ data.wait = wait;
+ if (wait)
+ atomic_set(&data.finished, 0);
+
+ for (cpu = first_cpu(mask); cpu != NR_CPUS; cpu = next_cpu(cpu, mask))
+ smp_call_function_single(cpu, kvm_ack_smp_call, &data, 1, 0);
+
+ while (atomic_read(&data.started) != cpus) {
+ cpu_relax();
+ barrier();
+ }
+
+ if (!wait)
+ return 0;
+
+ while (atomic_read(&data.finished) != cpus) {
+ cpu_relax();
+ barrier();
+ }
+ return 0;
+}
+#endif
--
1.5.2.4
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