linux-kernel - Re: [PATCH] x86: fix wakeup_cpu with numaq/es7000 v2

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Date:	Wed, 19 Nov 2008 20:50:53 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>,
	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: fix wakeup_cpu with numaq/es7000 v2 - fix v2

Ingo Molnar wrote:
> * Yinghai Lu <yinghai@...nel.org> wrote:
> 
>> Impact: fix wakeup_secondary_cpu with hotplug
>>
>> We can not put that in x86_quirks, because that is __initdata.
>> So try to move that to genapic, and add update_genapic in x86_quirks.
>>
>> later we even could use that stub to
>> 1. autodetect CONFIG_ES7000_CLUSTERED_APIC
>> 2. more correct inquire_remote_apic with apic_verbosity setting.
> 
> thanks - this patch and the next one did the trick to stabilize the 
> tip/x86/quirks topic tree - no more hotplug crashes and no more build 
> failures either. The lineup is:
> 
>  b5fe363: x86: use update_genapic to get rid of ES7000_CLUSTERED_APIC v2
>  f632ddc: x86: fix wakeup_cpu with numaq/es7000, v2, fix #2
>  54ac14a: x86: fix wakeup_cpu with numaq/es7000, v2, fix
>  569712b: x86: fix wakeup_cpu with numaq/es7000, v2
> 
> and i've merged them into tip/master as well.
> 

need more update_genapic calling

diff --git a/arch/x86/mach-generic/probe.c b/arch/x86/mach-generic/probe.c
index 90b134f..c346d9d 100644
--- a/arch/x86/mach-generic/probe.c
+++ b/arch/x86/mach-generic/probe.c
@@ -76,12 +76,15 @@ void __init generic_bigsmp_probe(void)
 	 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
 	 */
 
-	if (!cmdline_apic && genapic == &apic_default)
+	if (!cmdline_apic && genapic == &apic_default) {
 		if (apic_bigsmp.probe()) {
 			genapic = &apic_bigsmp;
+			if (x86_quirks->update_genapic)
+				x86_quirks->update_genapic();
 			printk(KERN_INFO "Overriding APIC driver with %s\n",
 			       genapic->name);
 		}
+	}
 #endif
 }
 
@@ -98,6 +101,9 @@ void __init generic_apic_probe(void)
 		/* Not visible without early console */
 		if (!apic_probe[i])
 			panic("Didn't find an APIC driver");
+
+		if (x86_quirks->update_genapic)
+			x86_quirks->update_genapic();
 	}
 	printk(KERN_INFO "Using APIC driver %s\n", genapic->name);
 }
@@ -112,6 +118,8 @@ int __init mps_oem_check(struct mp_config_table *mpc, char *oem,
 		if (apic_probe[i]->mps_oem_check(mpc, oem, productid)) {
 			if (!cmdline_apic) {
 				genapic = apic_probe[i];
+				if (x86_quirks->update_genapic)
+					x86_quirks->update_genapic();
 				printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 				       genapic->name);
 			}
@@ -128,6 +136,8 @@ int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 		if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
 			if (!cmdline_apic) {
 				genapic = apic_probe[i];
+				if (x86_quirks->update_genapic)
+					x86_quirks->update_genapic();
 				printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 				       genapic->name);
 			}
--
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