diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2017-03-17 00:50:07 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-06-28 23:32:56 +0300 |
| commit | df65c1bcd9b7b639177a5a15da1b8dc3bee4f5fa (patch) | |
| tree | cf57264f1343300b390569054fa8e6bb068babd7 /arch/x86 | |
| parent | 714fe383d6c9bd95d0d2cad8cbeff3688342d025 (diff) | |
| download | linux-df65c1bcd9b7b639177a5a15da1b8dc3bee4f5fa.tar.xz | |
x86/PCI: Select CONFIG_PCI_LOCKLESS_CONFIG
All x86 PCI configuration space accessors have either their own
serialization or can operate completely lockless (ECAM).
Disable the global lock in the generic PCI configuration space accessors.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <helgaas@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: linux-pci@vger.kernel.org
Link: http://lkml.kernel.org/r/20170316215057.295079391@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/pci/common.c | 4 |
2 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 0efb4c9497bc..0652c9f8902e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -166,6 +166,7 @@ config X86 select HAVE_UNSTABLE_SCHED_CLOCK select HAVE_USER_RETURN_NOTIFIER select IRQ_FORCED_THREADING + select PCI_LOCKLESS_CONFIG select PERF_EVENTS select RTC_LIB select RTC_MC146818_LIB diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c index 190e718694b1..cfd1a89fd04e 100644 --- a/arch/x86/pci/common.c +++ b/arch/x86/pci/common.c @@ -75,8 +75,8 @@ struct pci_ops pci_root_ops = { }; /* - * This interrupt-safe spinlock protects all accesses to PCI - * configuration space. + * This interrupt-safe spinlock protects all accesses to PCI configuration + * space, except for the mmconfig (ECAM) based operations. */ DEFINE_RAW_SPINLOCK(pci_config_lock); |