linux-kernel - [GIT PULL] x86 fixes for v3.14-rc4

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Date:	Fri, 2 May 2014 12:03:18 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Behan Webster <behanw@...verseincode.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oren Twaig <oren@...lemp.com>,
	Shai Fultheim <shai@...lemp.com>,
	Thomas Gleixner <tglx@...utronix.de>, dwmw2@...radead.org,
	pageexec@...email.hu, torvalds@...ux-foundation.org
Subject: [GIT PULL] x86 fixes for v3.14-rc4

Hi Linus,

Two very small changes: one fix for the vSMP Foundation platform, and
one to help LLVM not choke on options it doesn't understand (although
it probably should.)

The following changes since commit c089b229dfdd09d59a11d8bc2344bf8196d575ce:

  Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml (2014-04-21 10:05:35 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus

  x86/vsmp: Fix irq routing (2014-04-28 09:27:34 +0200)

----------------------------------------------------------------
Behan Webster (1):
      x86: LLVMLinux: Wrap -mno-80387 with cc-option

Oren Twaig (1):
      x86/vsmp: Fix irq routing

 arch/x86/Makefile         |  4 +++-
 arch/x86/kernel/vsmp_64.c | 11 ++++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index d1b7c377a234..ce6ad7e6a7d7 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -83,7 +83,9 @@ else
         KBUILD_CFLAGS += -m64
 
         # Don't autogenerate traditional x87, MMX or SSE instructions
-        KBUILD_CFLAGS += -mno-mmx -mno-sse -mno-80387 -mno-fp-ret-in-387
+        KBUILD_CFLAGS += -mno-mmx -mno-sse
+        KBUILD_CFLAGS += $(call cc-option,-mno-80387)
+        KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
 
 	# Use -mpreferred-stack-boundary=3 if supported.
 	KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index f6584a90aba3..5edc34b5b951 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -26,6 +26,9 @@
 
 #define TOPOLOGY_REGISTER_OFFSET 0x10
 
+/* Flag below is initialized once during vSMP PCI initialization. */
+static int irq_routing_comply = 1;
+
 #if defined CONFIG_PCI && defined CONFIG_PARAVIRT
 /*
  * Interrupt control on vSMPowered systems:
@@ -101,6 +104,10 @@ static void __init set_vsmp_pv_ops(void)
 #ifdef CONFIG_SMP
 	if (cap & ctl & BIT(8)) {
 		ctl &= ~BIT(8);
+
+		/* Interrupt routing set to ignore */
+		irq_routing_comply = 0;
+
 #ifdef CONFIG_PROC_FS
 		/* Don't let users change irq affinity via procfs */
 		no_irq_affinity = 1;
@@ -218,7 +225,9 @@ static void vsmp_apic_post_init(void)
 {
 	/* need to update phys_pkg_id */
 	apic->phys_pkg_id = apicid_phys_pkg_id;
-	apic->vector_allocation_domain = fill_vector_allocation_domain;
+
+	if (!irq_routing_comply)
+		apic->vector_allocation_domain = fill_vector_allocation_domain;
 }
 
 void __init vsmp_init(void)
--
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