From: Ravikiran G Thirumalai <kiran@scalex86.org>
Date: Fri, 4 Apr 2008 10:06:29 +0000 (-0700)
Subject: x86: fix breakage of vSMP irq operations
X-Git-Tag: v2.6.25-rc9~67^2~7
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bae1d2507e44417455eda76d4435352fee14cf51;p=linux-2.6

x86: fix breakage of vSMP irq operations

25-rc* stopped working with CONFIG_X86_VSMP on vSMP machines.

Looks like the vsmp irq ops got accidentally removed during merge of x86_64
pvops in 2.6.25. -- commit 6abcd98ffafbff81f0bfd7ee1d129e634af13245 removed
vsmp irq ops.

Tested with both CONFIG_X86_VSMP and without CONFIG_X86_VSMP, on vSMP and non
vSMP x86_64 machines.

Please apply.

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/include/asm-x86/irqflags.h b/include/asm-x86/irqflags.h
index 92021c1ffa..0e2292483b 100644
--- a/include/asm-x86/irqflags.h
+++ b/include/asm-x86/irqflags.h
@@ -70,6 +70,26 @@ static inline void raw_local_irq_restore(unsigned long flags)
 	native_restore_fl(flags);
 }
 
+#ifdef CONFIG_X86_VSMP
+
+/*
+ * Interrupt control for the VSMP architecture:
+ */
+
+static inline void raw_local_irq_disable(void)
+{
+	unsigned long flags = __raw_local_save_flags();
+	raw_local_irq_restore((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
+}
+
+static inline void raw_local_irq_enable(void)
+{
+	unsigned long flags = __raw_local_save_flags();
+	raw_local_irq_restore((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
+}
+
+#else
+
 static inline void raw_local_irq_disable(void)
 {
 	native_irq_disable();
@@ -80,6 +100,8 @@ static inline void raw_local_irq_enable(void)
 	native_irq_enable();
 }
 
+#endif
+
 /*
  * Used in the idle loop; sti takes one instruction cycle
  * to complete:
@@ -137,10 +159,17 @@ static inline unsigned long __raw_local_irq_save(void)
 #define raw_local_irq_save(flags) \
 		do { (flags) = __raw_local_irq_save(); } while (0)
 
+#ifdef CONFIG_X86_VSMP
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+	return !(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC);
+}
+#else
 static inline int raw_irqs_disabled_flags(unsigned long flags)
 {
 	return !(flags & X86_EFLAGS_IF);
 }
+#endif
 
 static inline int raw_irqs_disabled(void)
 {