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| author | Robert Richter <robert.richter@amd.com> | 2009-07-09 17:11:45 +0400 |
|---|---|---|
| committer | Robert Richter <robert.richter@amd.com> | 2009-07-20 18:43:21 +0400 |
| commit | 39e97f40c3a5e71de0532368deaa683e09b74ba2 (patch) | |
| tree | d30e542c6aa87a68ba16bd412067682efc606758 /arch/x86/oprofile | |
| parent | 52471c67ee2fa5ed6f700ef57bf27833c63b2192 (diff) | |
| download | linux-39e97f40c3a5e71de0532368deaa683e09b74ba2.tar.xz | |
x86/oprofile: Add function has_mux() to check multiplexing support
The check is used to prevent running multiplexing code for models not
supporting multiplexing. Before, the code was running but without
effect.
Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'arch/x86/oprofile')
| -rw-r--r-- | arch/x86/oprofile/nmi_int.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c index 82ee29517f16..dca7240aeb26 100644 --- a/arch/x86/oprofile/nmi_int.c +++ b/arch/x86/oprofile/nmi_int.c @@ -124,6 +124,11 @@ static void nmi_stop(void) static DEFINE_PER_CPU(int, switch_index); +static inline int has_mux(void) +{ + return !!model->switch_ctrl; +} + inline int op_x86_phys_to_virt(int phys) { return __get_cpu_var(switch_index) + phys; @@ -132,6 +137,10 @@ inline int op_x86_phys_to_virt(int phys) static void nmi_shutdown_mux(void) { int i; + + if (!has_mux()) + return; + for_each_possible_cpu(i) { kfree(per_cpu(cpu_msrs, i).multiplex); per_cpu(cpu_msrs, i).multiplex = NULL; @@ -144,12 +153,17 @@ static int nmi_setup_mux(void) size_t multiplex_size = sizeof(struct op_msr) * model->num_virt_counters; int i; + + if (!has_mux()) + return 1; + for_each_possible_cpu(i) { per_cpu(cpu_msrs, i).multiplex = kmalloc(multiplex_size, GFP_KERNEL); if (!per_cpu(cpu_msrs, i).multiplex) return 0; } + return 1; } @@ -158,6 +172,9 @@ static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs) int i; struct op_msr *multiplex = msrs->multiplex; + if (!has_mux()) + return; + for (i = 0; i < model->num_virt_counters; ++i) { if (counter_config[i].enabled) { multiplex[i].saved = -(u64)counter_config[i].count; @@ -229,7 +246,7 @@ static int nmi_multiplex_on(void) static int nmi_switch_event(void) { - if (!model->switch_ctrl) + if (!has_mux()) return -ENOSYS; /* not implemented */ if (nmi_multiplex_on() < 0) return -EINVAL; /* not necessary */ |