linux-kernel - Re: [x86/mm] vsyscall_fn fault in early startup

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Date:	Fri, 11 Jan 2008 08:40:38 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Roland McGrath <roland@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [x86/mm] vsyscall_fn fault in early startup


* Roland McGrath <roland@...hat.com> wrote:

> I bisected my startup problem down to:

i fixed this in my tree yesterday but was held up by another problem 
from uploading it. The patch below should apply to the tree you have.

	Ingo

-------------->
Subject: x86: fix sched_clock()
From: Ingo Molnar <mingo@...e.hu>

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/rtc.c |   12 ------------
 include/asm-x86/msr.h |   11 ++++++++++-
 2 files changed, 10 insertions(+), 13 deletions(-)

Index: linux-x86.q/arch/x86/kernel/rtc.c
===================================================================
--- linux-x86.q.orig/arch/x86/kernel/rtc.c
+++ linux-x86.q/arch/x86/kernel/rtc.c
@@ -195,15 +195,3 @@ int update_persistent_clock(struct times
 {
 	return set_rtc_mmss(now.tv_sec);
 }
-
-unsigned long long __vsyscall_fn native_read_tsc(void)
-{
-	DECLARE_ARGS(val, low, high);
-
-	rdtsc_barrier();
-	asm volatile("rdtsc" : EAX_EDX_RET(val, low, high));
-	rdtsc_barrier();
-
-	return EAX_EDX_VAL(val, low, high);
-}
-EXPORT_SYMBOL_GPL(native_read_tsc);
Index: linux-x86.q/include/asm-x86/msr.h
===================================================================
--- linux-x86.q.orig/include/asm-x86/msr.h
+++ linux-x86.q/include/asm-x86/msr.h
@@ -91,7 +91,16 @@ static inline int native_write_msr_safe(
 	return err;
 }
 
-extern unsigned long long native_read_tsc(void);
+static __always_inline unsigned long long native_read_tsc(void)
+{
+	DECLARE_ARGS(val, low, high);
+
+	rdtsc_barrier();
+	asm volatile("rdtsc" : EAX_EDX_RET(val, low, high));
+	rdtsc_barrier();
+
+	return EAX_EDX_VAL(val, low, high);
+}
 
 static inline unsigned long long native_read_pmc(int counter)
 {
--
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