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authorAri Kauppi <kauppi@papupata.org>2011-01-20 13:57:19 -0500
committerRobert Richter <robert.richter@amd.com>2011-01-26 19:21:28 +0100
commitd14dd7e20d5e526557f5d3cfef4046a642f80924 (patch)
tree4f4d9c70322e0d2431b5ebdd08cb68dfa451e13b /include/linux/oprofile.h
parent1ea1bdf7faa4d0b5293e605f2e1ef1c2c59f6b53 (diff)
downloadlinux-linaro-stable-d14dd7e20d5e526557f5d3cfef4046a642f80924.tar.gz
ARM: oprofile: Fix backtraces in timer mode
Always allow backtraces when using oprofile on ARM, even if a PMU isn't present. Restores functionality originally introduced in commit 1b7b56982fdcd9d85effd76f3928cf5d6eb26155 ("oprofile: Always allow backtraces on ARM") by Richard Purdie. It is not that obvious, but there is now only one oprofile_arch_init() function. So the .backtrace callback is available also in timer mode. Implemented by removing code and using stubs for oprofile_perf_{init, exit} provided by <linux/oprofile.h>. This allows cleaning of other architecture specific implementations too. Cc: stable@kernel.org # 37.x Signed-off-by: Ari Kauppi <kauppi@papupata.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'include/linux/oprofile.h')
-rw-r--r--include/linux/oprofile.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/oprofile.h b/include/linux/oprofile.h
index 54c83827f913..1ca64113efe8 100644
--- a/include/linux/oprofile.h
+++ b/include/linux/oprofile.h
@@ -16,6 +16,8 @@
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/printk.h>
#include <asm/atomic.h>
/* Each escaped entry is prefixed by ESCAPE_CODE
@@ -190,6 +192,13 @@ int oprofile_write_commit(struct op_entry *entry);
int __init oprofile_perf_init(struct oprofile_operations *ops);
void oprofile_perf_exit(void);
char *op_name_from_perf_id(void);
+#else
+static inline int __init oprofile_perf_init(struct oprofile_operations *ops)
+{
+ pr_info("oprofile: hardware counters not available\n");
+ return -ENODEV;
+}
+static inline void oprofile_perf_exit(void) { }
#endif /* CONFIG_HW_PERF_EVENTS */
#endif /* OPROFILE_H */