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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-06-13 21:45:49 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-06-13 21:45:49 +0400 |
| commit | c78a9b9b8e36b8de302eddbe7a1688af3d9650ff (patch) | |
| tree | 3857996cf30ae6a60b5afe2e1e3e30f75fbca05e /arch/x86 | |
| parent | 842c895d140a75e5d67fa346213deb3ca2b460f8 (diff) | |
| parent | 5f127133ee432d0b83ee26e8e3a3d7828ab5f2b1 (diff) | |
| download | linux-c78a9b9b8e36b8de302eddbe7a1688af3d9650ff.tar.xz | |
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
ftrace: Revert 8ab2b7efd ftrace: Remove unnecessary disabling of irqs
kprobes/trace: Fix kprobe selftest for gcc 4.6
ftrace: Fix possible undefined return code
oprofile, dcookies: Fix possible circular locking dependency
oprofile: Fix locking dependency in sync_start()
oprofile: Free potentially owned tasks in case of errors
oprofile, x86: Add comments to IBS LVT offset initialization
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 3 | ||||
| -rw-r--r-- | arch/x86/oprofile/op_model_amd.c | 13 |
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; |