linux-kernel - [PATCH] x86: use native

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Message-Id: <E1PSBcz-0001g1-FM@eag09.americas.sgi.com>
Date:	Mon, 13 Dec 2010 10:51:57 -0600
From:	Cliff Wickman <cpw@....com>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] x86: use native_halt on a halt


halt() should use native_halt()
safe_halt() uses native_safe_halt()

If CONFIG_PARAVIRT=y, halt() is defined in arch/x86/include/asm/paravirt.h as

static inline void halt(void)
{
        PVOP_VCALL0(pv_irq_ops.safe_halt);
}

Otherwise (no CONFIG_PARAVIRT) halt() in arch/x86/include/asm/irqflags.h is

static inline void halt(void)
{
        native_halt();
}

So it looks to me like the CONFIG_PARAVIRT case of using native_safe_halt()
for a halt() is an oversight.
Am I missing something?

It probably hasn't shown up as a problem because the local apic is disabled
on a shutdown or restart.  But if we disable interrupts and call halt()
we shouldn't expect that the halt() will re-enable interrupts.

Signed-off-by: Cliff Wickman <cpw@....com>

---
 arch/x86/include/asm/paravirt.h |    2 +-
 arch/x86/kernel/apic/apic.c     |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Index: linux/arch/x86/include/asm/paravirt.h
===================================================================
--- linux.orig/arch/x86/include/asm/paravirt.h
+++ linux/arch/x86/include/asm/paravirt.h
@@ -112,7 +112,7 @@ static inline void raw_safe_halt(void)
 
 static inline void halt(void)
 {
-	PVOP_VCALL0(pv_irq_ops.safe_halt);
+	PVOP_VCALL0(pv_irq_ops.halt);
 }
 
 static inline void wbinvd(void)
--
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