[tip:x86/platform] x86/PCI: Select CONFIG_PCI_LOCKLESS_CONFIG

[tip-bot for Thomas Gleixner <tipbot@zytor.com>]

Commit-ID:  df65c1bcd9b7b639177a5a15da1b8dc3bee4f5fa
Gitweb:     http://git.kernel.org/tip/df65c1bcd9b7b639177a5a15da1b8dc3bee4f5fa
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Thu, 16 Mar 2017 22:50:07 +0100
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Wed, 28 Jun 2017 22:32:56 +0200

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>

---
 arch/x86/Kconfig      | 1 +
 arch/x86/pci/common.c | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0efb4c9..0652c9f 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 190e718..cfd1a89 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);