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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 /arch/arm/oprofile/common.c | |
| 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 'arch/arm/oprofile/common.c')
| -rw-r--r-- | arch/arm/oprofile/common.c | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/arch/arm/oprofile/common.c b/arch/arm/oprofile/common.c index 8aa974491dfc..2b663918c464 100644 --- a/arch/arm/oprofile/common.c +++ b/arch/arm/oprofile/common.c @@ -10,8 +10,6 @@ */ #include <linux/cpumask.h> -#include <linux/err.h> -#include <linux/errno.h> #include <linux/init.h> #include <linux/mutex.h> #include <linux/oprofile.h> @@ -46,6 +44,7 @@ char *op_name_from_perf_id(void) return NULL; } } +#endif static int report_trace(struct stackframe *frame, void *d) { @@ -111,6 +110,7 @@ static void arm_backtrace(struct pt_regs * const regs, unsigned int depth) int __init oprofile_arch_init(struct oprofile_operations *ops) { + /* provide backtrace support also in timer mode: */ ops->backtrace = arm_backtrace; return oprofile_perf_init(ops); @@ -120,11 +120,3 @@ void __exit oprofile_arch_exit(void) { oprofile_perf_exit(); } -#else -int __init oprofile_arch_init(struct oprofile_operations *ops) -{ - pr_info("oprofile: hardware counters not available\n"); - return -ENODEV; -} -void __exit oprofile_arch_exit(void) {} -#endif /* CONFIG_HW_PERF_EVENTS */ |