linux-kernel - [PATCH 6/10] inquire_remote_apic: use safe_apic_wait_icr_idle

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Date:	Wed, 25 Apr 2007 20:27:26 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	horms@...ge.net.au, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, ak@...e.de, vgoyal@...ibm.com,
	mbligh@...gle.com, Keith Owens <kaos@....com.au>,
	akpm@...ux-foundation.org
Subject: [PATCH 6/10] inquire_remote_apic: use safe_apic_wait_icr_idle -
	x86_64

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>
---

diff -urNp linux-2.6.21-rc7-orig/arch/x86_64/kernel/smpboot.c linux-2.6.21-rc7/arch/x86_64/kernel/smpboot.c
--- linux-2.6.21-rc7-orig/arch/x86_64/kernel/smpboot.c	2007-04-18 15:53:11.000000000 +0900
+++ linux-2.6.21-rc7/arch/x86_64/kernel/smpboot.c	2007-04-18 16:39:20.000000000 +0900
@@ -392,7 +392,8 @@ static void inquire_remote_apic(int apic
 {
 	unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 };
 	char *names[] = { "ID", "VERSION", "SPIV" };
-	int timeout, status;
+	int timeout;
+	unsigned int status;
 
 	printk(KERN_INFO "Inquiring remote APIC #%d...\n", apicid);
 
@@ -402,7 +403,9 @@ static void inquire_remote_apic(int 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(APIC_ICR2, SET_APIC_DEST_FIELD(apicid));
 		apic_write(APIC_ICR, APIC_DM_REMRD | regs[i]);


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