linux-kernel - Re: [PATCH] Configure out TSC support

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Date:	Mon, 18 Feb 2008 03:27:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, "H. Anvin" <hpa@...or.com>,
	Matt Mackall <mpm@...enic.com>, zwane@....linux.org.uk,
	Linux-tiny@...enic.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Configure out TSC support


> * Thomas Petazzoni <thomas.petazzoni@...e-electrons.com> wrote:
> 
> > The following patch allows to remove the code needed to support the 
> > TSC timer on x86 32 bits. The TSC seems to be mandatory on x86 64 
> > bits. The patch adds a X86_TSC_TIMER option to enable/disable the 
> > support.
> > 
> > A X86_TSC option already exists, but it is not an option, it's 
> > simply set to true when the processor has a TSC. However, the 
> > purpose of the patch is to disable the TSC support even if the 
> > processor has it.

make randconfig testing found a build failure due to this patch:

 arch/x86/mach-generic/built-in.o: In function `acpi_madt_oem_check':
 summit.c:(.text+0x290): undefined reference to `mark_tsc_unstable'
 arch/x86/mach-generic/built-in.o: In function `mps_oem_check':
 summit.c:(.text+0x310): undefined reference to `mark_tsc_unstable'
 [...]

config attached.

	Ingo

View attachment "config" of type "text/plain" (54951 bytes)