Commit df65c1bc authored Mar 16, 2017 by Thomas Gleixner

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>

parent 714fe383

arch/x86/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

arch/x86/pci/common.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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);

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