sh: oprofile: Fix up and extend op_name_from_perf_id().

[sfrench/cifs-2.6.git] / arch / sh / oprofile / common.c

diff --git a/arch/sh/oprofile/common.c b/arch/sh/oprofile/common.c
index e10d89376f9b79140adaa44f7fb63f0681604482..84533142da9b1e84e1aa05fa6d82d02208223f84 100644 (file)
--- a/arch/sh/oprofile/common.c
+++ b/arch/sh/oprofile/common.c
@@ -1,7 +1,7 @@
 /*
  * arch/sh/oprofile/init.c
  *
- * Copyright (C) 2003 - 2008  Paul Mundt
+ * Copyright (C) 2003 - 2010  Paul Mundt
  *
  * Based on arch/mips/oprofile/common.c:
  *
@@ -18,38 +18,41 @@
 #include <linux/errno.h>
 #include <linux/smp.h>
 #include <linux/perf_event.h>
+#include <linux/slab.h>
 #include <asm/processor.h>
 
 #ifdef CONFIG_HW_PERF_EVENTS
 extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth);
 
+/*
+ * This will need to be reworked when multiple PMUs are supported.
+ */
+static char *sh_pmu_op_name;
+
 char *op_name_from_perf_id(void)
 {
-       const char *pmu;
-       char buf[20];
-       int size;
-
-       pmu = perf_pmu_name();
-       if (!pmu)
-               return NULL;
-
-       size = snprintf(buf, sizeof(buf), "sh/%s", pmu);
-       if (size > -1 && size < sizeof(buf))
-               return buf;
-
-       return NULL;
+       return sh_pmu_op_name;
 }
 
 int __init oprofile_arch_init(struct oprofile_operations *ops)
 {
        ops->backtrace = sh_backtrace;
 
+       if (perf_num_counters() == 0)
+               return -ENODEV;
+
+       sh_pmu_op_name = kasprintf(GFP_KERNEL, "%s/%s",
+                                  UTS_MACHINE, perf_pmu_name());
+       if (unlikely(!sh_pmu_op_name))
+               return -ENOMEM;
+
        return oprofile_perf_init(ops);
 }
 
 void __exit oprofile_arch_exit(void)
 {
        oprofile_perf_exit();
+       kfree(sh_pmu_op_name);
 }
 #else
 int __init oprofile_arch_init(struct oprofile_operations *ops)