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oprofile, x86: Convert memory allocation to static array

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On -rt, allocators don't work from atomic context any more,
and the maximum size of the array is known at compile time.

Call trace on a -rt kernel:

oprofile: using NMI interrupt.
BUG: sleeping function called from invalid context at kernel/rtmutex.c:645
in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: kworker/0:1
Pid: 0, comm: kworker/0:1 Tainted: G         C  3.0.0-rt3-patser+ #39
Call Trace:
 <IRQ>  [<ffffffff8103fc0a>] __might_sleep+0xca/0xf0
 [<ffffffff8160d424>] rt_spin_lock+0x24/0x40
 [<ffffffff811476c7>] __kmalloc+0xc7/0x370
 [<ffffffffa0275c85>] ? ppro_setup_ctrs+0x215/0x260 [oprofile]
 [<ffffffffa0273de0>] ? oprofile_cpu_notifier+0x60/0x60 [oprofile]
 [<ffffffffa0275c85>] ppro_setup_ctrs+0x215/0x260 [oprofile]
 [<ffffffffa0273de0>] ? oprofile_cpu_notifier+0x60/0x60 [oprofile]
 [<ffffffffa0273de0>] ? oprofile_cpu_notifier+0x60/0x60 [oprofile]
 [<ffffffffa0273ea4>] nmi_cpu_setup+0xc4/0x110 [oprofile]
 [<ffffffff81094455>] generic_smp_call_function_interrupt+0x95/0x190
 [<ffffffff8101df77>] smp_call_function_interrupt+0x27/0x40
 [<ffffffff81615093>] call_function_interrupt+0x13/0x20
 <EOI>  [<ffffffff8131d0c4>] ? plist_check_head+0x54/0xc0
 [<ffffffff81371fe8>] ? intel_idle+0xc8/0x120
 [<ffffffff81371fc7>] ? intel_idle+0xa7/0x120
 [<ffffffff814a57b0>] cpuidle_idle_call+0xb0/0x230
 [<ffffffff810011db>] cpu_idle+0x8b/0xe0
 [<ffffffff815fc82f>] start_secondary+0x1d3/0x1d8

Signed-off-by: Maarten Lankhorst <m.b.lankhorst@gmail.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Maarten Lankhorst 2011-08-01 11:08:59 -04:00 • committed by Robert Richter
commit 1d12d35284
1 changed files with 1 additions and 23 deletions
Download patch file Download diff file Expand all files Collapse all files

24
arch/x86/oprofile/op_model_ppro.c
View file

@ -28,7 +28,7 @@ static int counter_width = 32;
#define MSR_PPRO_EVENTSEL_RESERVED ((0xFFFFFFFFULL<<32)|(1ULL<<21))
static u64 *reset_value;
static u64 reset_value[OP_MAX_COUNTER];
static void ppro_shutdown(struct op_msrs const * const msrs)
{
@ -40,10 +40,6 @@ static void ppro_shutdown(struct op_msrs const * const msrs)
release_perfctr_nmi(MSR_P6_PERFCTR0 + i);
release_evntsel_nmi(MSR_P6_EVNTSEL0 + i);
}
if (reset_value) {
kfree(reset_value);
reset_value = NULL;
}
}
static int ppro_fill_in_addresses(struct op_msrs * const msrs)
@ -79,13 +75,6 @@ static void ppro_setup_ctrs(struct op_x86_model_spec const *model,
u64 val;
int i;
if (!reset_value) {
reset_value = kzalloc(sizeof(reset_value[0]) * num_counters,
GFP_ATOMIC);
if (!reset_value)
return;
}
if (cpu_has_arch_perfmon) {
union cpuid10_eax eax;
eax.full = cpuid_eax(0xa);
@ -141,13 +130,6 @@ static int ppro_check_ctrs(struct pt_regs * const regs,
u64 val;
int i;
/*
* This can happen if perf counters are in use when
* we steal the die notifier NMI.
*/
if (unlikely(!reset_value))
goto out;
for (i = 0; i < num_counters; ++i) {
if (!reset_value[i])
continue;
@ -179,8 +161,6 @@ static void ppro_start(struct op_msrs const * const msrs)
u64 val;
int i;
if (!reset_value)
return;
for (i = 0; i < num_counters; ++i) {
if (reset_value[i]) {
rdmsrl(msrs->controls[i].addr, val);
@ -196,8 +176,6 @@ static void ppro_stop(struct op_msrs const * const msrs)
u64 val;
int i;
if (!reset_value)
return;
for (i = 0; i < num_counters; ++i) {
if (!reset_value[i])
continue;