linux-kernel - [PATCH] [10/34] i386: use safe_apic_wait_icr

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Message-Id: <20070430154942.539F3151D3@wotan.suse.de>
Date:	Mon, 30 Apr 2007 17:49:42 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	fernando@....ntt.co.jp, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [10/34] i386: use safe_apic_wait_icr_idle in smpboot.c 


From: Fernando Luis VazquezCao <fernando@....ntt.co.jp>

__inquire_remote_apic is used for APIC debugging, so use
safe_apic_wait_icr_idle  instead of apic_wait_icr_idle to avoid possible
lockups when APIC delivery fails.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
Signed-off-by: Andi Kleen <ak@...e.de>

---

---
 arch/i386/kernel/smpboot.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: linux/arch/i386/kernel/smpboot.c
===================================================================
--- linux.orig/arch/i386/kernel/smpboot.c
+++ linux/arch/i386/kernel/smpboot.c
@@ -521,7 +521,8 @@ static inline void __inquire_remote_apic
 {
 	int i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 };
 	char *names[] = { "ID", "VERSION", "SPIV" };
-	int timeout, status;
+	int timeout;
+	unsigned long status;
 
 	printk("Inquiring remote APIC #%d...\n", apicid);
 
@@ -531,7 +532,9 @@ static inline void __inquire_remote_apic
 		/*
 		 * Wait for idle.
 		 */
-		apic_wait_icr_idle();
+		status = safe_apic_wait_icr_idle();
+		if (status)
+			printk("a previous APIC delivery may have failed\n");
 
 		apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(apicid));
 		apic_write_around(APIC_ICR, APIC_DM_REMRD | regs[i]);
-
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