linux-kernel - [patch] cpufreq: mark cpufreq_tsc() as core_initcall

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Date:	Thu, 16 Nov 2006 21:15:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Gleixner <tglx@...esys.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	john stultz <johnstul@...ibm.com>,
	David Miller <davem@...emloft.net>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@...e.de>
Subject: [patch] cpufreq: mark cpufreq_tsc() as core_initcall_sync


* Thomas Gleixner <tglx@...esys.com> wrote:

> [PATCH] cpufreq: make the transition_notifier chain use SRCU
> (b4dfdbb3c707474a2254c5b4d7e62be31a4b7da9)
> 
> breaks cpu frequency notification users, which register the callback 
> on core_init level. Interestingly enough the registration survives the 
> uninitialized head, but the registered user is lost by:

i have hit this bug in -rt (it caused a lockup) and have fixed it - 
forgot to send it upstream. Find the patch below.

	Ingo

---------------->
From: Ingo Molnar <mingo@...e.hu>
Subject: [patch] cpufreq: mark cpufreq_tsc() as core_initcall_sync

init_cpufreq_transition_notifier_list() should execute first, which is a 
core_initcall, so mark cpufreq_tsc() core_initcall_sync.

Signed-off-by: Ingo Molnar <mingo@...e.hu>

--- linux.orig/arch/x86_64/kernel/tsc.c
+++ linux/arch/x86_64/kernel/tsc.c
@@ -138,7 +138,11 @@ static int __init cpufreq_tsc(void)
 	return 0;
 }
 
-core_initcall(cpufreq_tsc);
+/*
+ * init_cpufreq_transition_notifier_list() should execute first,
+ * which is a core_initcall, so mark this one core_initcall_sync:
+ */
+core_initcall_sync(cpufreq_tsc);
 
 #endif
 /*
-
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