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authorIngo Molnar <mingo@elte.hu>2011-06-08 15:49:03 +0200
committerIngo Molnar <mingo@elte.hu>2011-06-08 15:49:03 +0200
commit86dd7909c2c4ae3f219a9233bf0f095b05632ecf (patch)
tree1808de2a661434cc8a930bc8f8a248c5cf70ca2c /arch/x86
parentd7ebe75b065a7c2d58ffc12f9d2e00d5ea4e71eb (diff)
parentcbf74cea070fa1f705de4712e25d9e56ae6543c7 (diff)
Merge branch 'urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile into perf/urgent
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/apic/apic.c3
-rw-r--r--arch/x86/oprofile/op_model_amd.c13
2 files changed, 11 insertions, 5 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index b961af86bfea..b9338b8cf420 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -390,7 +390,8 @@ static unsigned int reserve_eilvt_offset(int offset, unsigned int new)
/*
* If mask=1, the LVT entry does not generate interrupts while mask=0
- * enables the vector. See also the BKDGs.
+ * enables the vector. See also the BKDGs. Must be called with
+ * preemption disabled.
*/
int setup_APIC_eilvt(u8 offset, u8 vector, u8 msg_type, u8 mask)
diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
index 9fd8a567fe1e..9cbb710dc94b 100644
--- a/arch/x86/oprofile/op_model_amd.c
+++ b/arch/x86/oprofile/op_model_amd.c
@@ -609,16 +609,21 @@ static int setup_ibs_ctl(int ibs_eilvt_off)
return 0;
}
+/*
+ * This runs only on the current cpu. We try to find an LVT offset and
+ * setup the local APIC. For this we must disable preemption. On
+ * success we initialize all nodes with this offset. This updates then
+ * the offset in the IBS_CTL per-node msr. The per-core APIC setup of
+ * the IBS interrupt vector is called from op_amd_setup_ctrs()/op_-
+ * amd_cpu_shutdown() using the new offset.
+ */
static int force_ibs_eilvt_setup(void)
{
int offset;
int ret;
- /*
- * find the next free available EILVT entry, skip offset 0,
- * pin search to this cpu
- */
preempt_disable();
+ /* find the next free available EILVT entry, skip offset 0 */
for (offset = 1; offset < APIC_EILVT_NR_MAX; offset++) {
if (get_eilvt(offset))
break;