[PATCH v3] x86/oprofile: switch to xv[mz]alloc_array()

[Jan Beulich]

Use the more "modern" forms, thus doing away with effectively open-
coding xmalloc_array() at the same time. While there is a difference in
generated code, as xmalloc_bytes() forces SMP_CACHE_BYTES alignment, if
code really cared about such higher than default alignment, it should
request so explicitly.

While at it also use XVFREE() instead of open-coding it, or instead of
leaving a dangling pointer, and change loop induction variable types.

Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
v3: Use xvmalloc*(), extending to op_model_ppro.c as well.

--- a/xen/arch/x86/oprofile/nmi_int.c
+++ b/xen/arch/x86/oprofile/nmi_int.c
@@ -19,7 +19,10 @@
 #include <xen/string.h>
 #include <xen/delay.h>
 #include <xen/xenoprof.h>
+#include <xen/xvmalloc.h>
+
 #include <public/xenoprof.h>
+
 #include <asm/msr.h>
 #include <asm/apic.h>
 #include <asm/regs.h>
@@ -142,30 +145,29 @@ static void cf_check nmi_save_registers(
 
 static void free_msrs(void)
 {
-       int i;
+       unsigned int i;
+
        for (i = 0; i < nr_cpu_ids; ++i) {
-               xfree(cpu_msrs[i].counters);
-               cpu_msrs[i].counters = NULL;
-               xfree(cpu_msrs[i].controls);
-               cpu_msrs[i].controls = NULL;
+               XVFREE(cpu_msrs[i].counters);
+               XVFREE(cpu_msrs[i].controls);
        }
 }
 
 
 static int allocate_msrs(void)
 {
+       unsigned int i;
        int success = 1;
-       size_t controls_size = sizeof(struct op_msr) * model->num_controls;
-       size_t counters_size = sizeof(struct op_msr) * model->num_counters;
 
-       int i;
        for_each_online_cpu (i) {
-               cpu_msrs[i].counters = xmalloc_bytes(counters_size);
+               cpu_msrs[i].counters = xvmalloc_array(struct op_msr,
+                                                     model->num_counters);
                if (!cpu_msrs[i].counters) {
                        success = 0;
                        break;
                }
-               cpu_msrs[i].controls = xmalloc_bytes(controls_size);
+               cpu_msrs[i].controls = xvmalloc_array(struct op_msr,
+                                                     model->num_controls);
                if (!cpu_msrs[i].controls) {
                        success = 0;
                        break;
--- a/xen/arch/x86/oprofile/op_model_ppro.c
+++ b/xen/arch/x86/oprofile/op_model_ppro.c
@@ -10,9 +10,11 @@
  * @author Graydon Hoare
  */
 
+#include <xen/sched.h>
 #include <xen/types.h>
 #include <xen/xenoprof.h>
-#include <xen/sched.h>
+#include <xen/xvmalloc.h>
+
 #include <asm/msr.h>
 #include <asm/io.h>
 #include <asm/apic.h>
@@ -231,7 +233,7 @@ static int cf_check ppro_allocate_msr(st
        struct vpmu_struct *vpmu = vcpu_vpmu(v);
        struct arch_msr_pair *msr_content;
 
-       msr_content = xzalloc_array(struct arch_msr_pair, num_counters);
+       msr_content = xvzalloc_array(struct arch_msr_pair, num_counters);
        if ( !msr_content )
                goto out;
        vpmu->context = (void *)msr_content;
@@ -251,7 +253,7 @@ static void cf_check ppro_free_msr(struc
 
        if ( !vpmu_is_set(vpmu, VPMU_PASSIVE_DOMAIN_ALLOCATED) )
                return;
-       xfree(vpmu->context);
+       XVFREE(vpmu->context);
        vpmu_reset(vpmu, VPMU_PASSIVE_DOMAIN_ALLOCATED);
 }