linux-kernel - hidden patch conflict in arch/x86/kernel/cpu/perfctr-watchdog.c

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Message-Id: <47582E0F.76E4.0078.0@novell.com>
Date:	Thu, 06 Dec 2007 16:14:55 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<eranian@....hp.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: hidden patch conflict in
	arch/x86/kernel/cpu/perfctr-watchdog.c

There apparently was an unnoticed conflict between your patch (committed
as 23d5ea5d3edcfe899cd91fca87a4af799bcc5794 2.6.23) and mine
(d1e084746b0e5806e6345ab31c5b370f8dee2b23), which I noticed only now.
I suppose a change like the one below (untested) is needed; before officially
submitting I'd like to confirm this with you.

The issue is the writing of the 'checkbit' member at the end of
setup_intel_arch_watchdog(), which my patch made go to intel_arch_wd_ops
rather than wd_ops.

Jan

--- a/arch/x86/kernel/cpu/perfctr-watchdog.c
+++ b/arch/x86/kernel/cpu/perfctr-watchdog.c
@@ -615,16 +615,6 @@ static struct wd_ops intel_arch_wd_ops _
 	.evntsel = MSR_ARCH_PERFMON_EVENTSEL1,
 };
 
-static struct wd_ops coreduo_wd_ops = {
-	.reserve = single_msr_reserve,
-	.unreserve = single_msr_unreserve,
-	.setup = setup_intel_arch_watchdog,
-	.rearm = p6_rearm,
-	.stop = single_msr_stop_watchdog,
-	.perfctr = MSR_ARCH_PERFMON_PERFCTR0,
-	.evntsel = MSR_ARCH_PERFMON_EVENTSEL0,
-};
-
 static void probe_nmi_watchdog(void)
 {
 	switch (boot_cpu_data.x86_vendor) {
@@ -638,8 +628,8 @@ static void probe_nmi_watchdog(void)
 		/* Work around Core Duo (Yonah) errata AE49 where perfctr1
 		   doesn't have a working enable bit. */
 		if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 14) {
-			wd_ops = &coreduo_wd_ops;
-			break;
+			intel_arch_wd_ops.perfctr = MSR_ARCH_PERFMON_PERFCTR0;
+			intel_arch_wd_ops.evntsel = MSR_ARCH_PERFMON_EVENTSEL0;
 		}
 		if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
 			wd_ops = &intel_arch_wd_ops;


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