diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2019-06-18 09:32:11 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-07-24 14:43:37 +0200 |
| commit | 21e450d21ccad4cb7c7984c29ff145012b47736d (patch) | |
| tree | 17a6ad3e3620cedd781fa9096abaa4d3b14d0a30 /arch/x86/events | |
| parent | 5f9e832c137075045d15cd6899ab0505cfb2ca4b (diff) | |
x86/mm: Avoid redundant interrupt disable in load_mm_cr4()
load_mm_cr4() is always called with interrupts disabled from:
- switch_mm_irqs_off()
- refresh_pce(), which is a on_each_cpu() callback
Thus, disabling interrupts in cr4_set/clear_bits() is redundant.
Implement cr4_set/clear_bits_irqsoff() helpers, rename load_mm_cr4() to
load_mm_cr4_irqsoff() and use the new helpers. The new helpers do not need
a lockdep assert as __cr4_set() has one already.
The renaming in combination with the checks in __cr4_set() ensure that any
changes in the boundary conditions at the call sites will be detected.
[ tglx: Massaged change log ]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/0fbbcb64-5f26-4ffb-1bb9-4f5f48426893@siemens.com
Diffstat (limited to 'arch/x86/events')
| -rw-r--r-- | arch/x86/events/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 81b005e4c7d9..cfe256ca76df 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2087,7 +2087,7 @@ static int x86_pmu_event_init(struct perf_event *event) static void refresh_pce(void *ignored) { - load_mm_cr4(this_cpu_read(cpu_tlbstate.loaded_mm)); + load_mm_cr4_irqsoff(this_cpu_read(cpu_tlbstate.loaded_mm)); } static void x86_pmu_event_mapped(struct perf_event *event, struct mm_struct *mm) |