Move the perf-events backend from arch/arm/oprofile into
drivers/oprofile so that the code can be shared between architectures.

This allows each architecture to maintain only a single copy of the
PMU accessor functions instead of one for both perf and OProfile. It
also becomes possible for other architectures to delete much of their
OProfile code in favour of the common code now available in
drivers/oprofile/oprofile_perf.c.

Signed-off-by: Matt Fleming <redacted>
---
 arch/arm/oprofile/Makefile       |    4 +
 arch/arm/oprofile/common.c       |  215 +++-----------------------------------
 drivers/oprofile/oprofile_perf.c |  209 ++++++++++++++++++++++++++++++++++++
 include/linux/oprofile.h         |   12 ++
 4 files changed, 242 insertions(+), 198 deletions(-)
 create mode 100644 drivers/oprofile/oprofile_perf.c

diff --git a/arch/arm/oprofile/Makefile b/arch/arm/oprofile/Makefile
index e666eaf..038d7af 100644
--- a/arch/arm/oprofile/Makefile
+++ b/arch/arm/oprofile/Makefile

@@ -6,4 +6,8 @@ DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
                oprofilefs.o oprofile_stats.o \
                timer_int.o )

+ifeq ($(CONFIG_HW_PERF_EVENTS), y)
+DRIVER_OBJS += $(addprefix ../../../drivers/oprofile/, oprofile_perf.o)
+endif

diff --git a/include/linux/oprofile.h b/include/linux/oprofile.h
index 5171639..99e0323 100644
--- a/include/linux/oprofile.h
+++ b/include/linux/oprofile.h

@@ -185,4 +185,16 @@ int oprofile_add_data(struct op_entry *entry, unsigned long val);
 int oprofile_add_data64(struct op_entry *entry, u64 val);
 int oprofile_write_commit(struct op_entry *entry);

+/* Oprofile perf wrapper functions. */
+
+#ifdef CONFIG_PERF_EVENTS
+int oprofile_perf_init(void);
+void oprofile_perf_exit(void);
+int oprofile_perf_setup(void);
+int oprofile_perf_start(void);
+void oprofile_perf_stop(void);
+int oprofile_perf_create_files(struct super_block *sb, struct dentry *root);
+void oprofile_perf_set_num_counters(int num_counters);
+#endif /* CONFIG_PERF_EVENTS */