linux-kernel - vread_tsc() compile error (post 2.6.26)

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Message-Id: <1216151261.25942.24.camel@nimitz>
Date:	Tue, 15 Jul 2008 12:47:41 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	mingo <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alok N Kataria <akataria@...are.com>,
	Alok N Kataria <akataria@...are.com>,
	Dan Hecht <dhecht@...are.com>
Subject: vread_tsc() compile error (post 2.6.26)

$ git describe
v2.6.26-2465-g1c0fea9

This looks like it was caused by:

	8fbbc4b45ce3e4c0eeb15004c79c72b6896a79c2

Did this get any testing on x86-32?  It looks like this symbol has no
32-bit equivalent.

...
  MODPOST vmlinux.o
WARNING: modpost: Found 11 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
  GEN     .version
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
arch/x86/kernel/built-in.o: In function `vread_tsc':
/home/dave/kernels/linux-2.6.git/arch/x86/kernel/tsc.c:365: undefined reference to `__vsyscall_gtod_data'
/home/dave/kernels/linux-2.6.git/arch/x86/kernel/tsc.c:365: undefined reference to `__vsyscall_gtod_data'
make: *** [.tmp_vmlinux1] Error 1

My config:

http://sr71.net/~dave/linux/config-2.6.26-rc8-00089-ge1441b9

-- Dave

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