linux-kernel - Re: [PATCH] AMD Thermal Interrupt Support

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Message-Id: <20080202161057.b240f443.akpm@linux-foundation.org>
Date:	Sat, 2 Feb 2008 16:10:57 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Russell Leidich" <rml@...gle.com>
Cc:	"Andi Kleen" <andi@...stfloor.org>,
	"Torsten Kaiser" <just.for.lkml@...glemail.com>,
	linux-kernel@...r.kernel.org,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...e.hu>, valdis.kletnieks@...edu,
	"Tim Hockin" <thockin@...gle.com>
Subject: Re: [PATCH] AMD Thermal Interrupt Support

On Thu, 17 Jan 2008 17:06:33 -0800 "Russell Leidich" <rml@...gle.com> wrote:

> > Here's the hopefully-final version of the patch, which I have just
> > tested on Intel and AMD.

Curious.  This just broke.

i386 allmodconfig:

arch/x86/kernel/cpu/mcheck/p4.o: In function `smp_thermal_interrupt':
arch/x86/kernel/cpu/mcheck/p4.c:61: multiple definition of `smp_thermal_interrupt'
arch/x86/kernel/cpu/mcheck/mce_thermal.o:arch/x86/kernel/cpu/mcheck/mce_thermal.c:17: first defined here
/opt/crosstool/gcc-4.1.0-glibc-2.3.6/i686-unknown-linux-gnu/bin/i686-unknown-linux-gnu-ld: Warning: size of symbol `smp_thermal_interrupt' changed from 4 in arch/x86/kernel/cpu/mcheck/mce_thermal.o to 43 in arch/x86/kernel/cpu/mcheck/p4.o
/opt/crosstool/gcc-4.1.0-glibc-2.3.6/i686-unknown-linux-gnu/bin/i686-unknown-linux-gnu-ld: Warning: type of symbol `smp_thermal_interrupt' changed from 1 to 2 in arch/x86/kernel/cpu/mcheck/p4.o

In mainline we just did this:

--- linux-2.6.24/arch/x86/kernel/cpu/mcheck/p4.c        2008-02-01 14:29:18.000000000 -0800
+++ devel/arch/x86/kernel/cpu/mcheck/p4.c       2008-02-02 15:38:06.000000000 -0800
@@ -57,7 +57,7 @@ static void intel_thermal_interrupt(stru
 /* Thermal interrupt handler for this CPU setup */
 static void (*vendor_thermal_interrupt)(struct pt_regs *regs) = unexpected_thermal_interrupt;
 
-fastcall void smp_thermal_interrupt(struct pt_regs *regs)
+void smp_thermal_interrupt(struct pt_regs *regs)

which I think was always wrong and has just now tripped up the linker.  I
_assume_ that function should be __attribute__((weak)).  Then again, maybe
I'm full of it.  But hey, it compiles now.

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