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| author | Ari Kauppi <kauppi@papupata.org> | 2011-01-20 13:57:19 -0500 |
|---|---|---|
| committer | Robert Richter <robert.richter@amd.com> | 2011-01-26 19:21:28 +0100 |
| commit | d14dd7e20d5e526557f5d3cfef4046a642f80924 (patch) | |
| tree | 4f4d9c70322e0d2431b5ebdd08cb68dfa451e13b /include/linux/oprofile.h | |
| parent | 1ea1bdf7faa4d0b5293e605f2e1ef1c2c59f6b53 (diff) | |
| download | lwn-d14dd7e20d5e526557f5d3cfef4046a642f80924.tar.gz lwn-d14dd7e20d5e526557f5d3cfef4046a642f80924.zip | |
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.h | 9 |
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 */ |