[BUG] 2.6.32-rc5 build failure on Alpha

[Bob Tracy]

Mainline 2.6.32-rc5 kernel build failure.  The last few lines of the kernel
build output are:

  LD      vmlinux.o
  MODPOST vmlinux.o
WARNING: "saved_config" [vmlinux] is COMMON symbol
  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/alpha/kernel/vmlinux.lds:241: undefined symbol `THREAD_SIZE' referenced in expression
make: *** [.tmp_vmlinux1] Error 1

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Bob Tracy          |  "Every normal man must be tempted at times to spit
rct@...       |   upon his hands, hoist the black flag, and begin
                   |   slitting throats." -- H.L. Mencken
------------------------------------------------------------------------


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[Bob Tracy]

On Wed, Oct 28, 2009 at 10:53:05PM -0500, Bob Tracy wrote:

> Mainline 2.6.32-rc5 kernel build failure.  The last few lines of the kernel
> build output are:
>
>   LD      vmlinux.o
>   MODPOST vmlinux.o
> WARNING: "saved_config" [vmlinux] is COMMON symbol
>   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/alpha/kernel/vmlinux.lds:241: undefined symbol `THREAD_SIZE' referenced in expression
> make: *** [.tmp_vmlinux1] Error 1

In arch/alpha/include/asm/thread_info.h, THREAD_SIZE is defined as
(2*PAGE_SIZE).  I tried editing arch/alpha/kernel/vmlinux.lds.S and making
that substitution manually, and the build succeeds.  "thread_info.h" is
being included, so I have no idea why the build is breaking.  gcc
version is 4.3.4 (Debian 4.3.4-5), and binutils version is
2.19.91.20091006.

--Bob


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[Bob Tracy]

On Wed, Oct 28, 2009 at 10:53:05PM -0500, Bob Tracy wrote:

> Mainline 2.6.32-rc5 kernel build failure.  The last few lines of the kernel
> build output are:
>
>   LD      vmlinux.o
>   MODPOST vmlinux.o
> WARNING: "saved_config" [vmlinux] is COMMON symbol
>   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/alpha/kernel/vmlinux.lds:241: undefined symbol `THREAD_SIZE' referenced in expression
> make: *** [.tmp_vmlinux1] Error 1

> In arch/alpha/include/asm/thread_info.h, THREAD_SIZE is defined as
> (2*PAGE_SIZE).

Ok.  Found it.  The THREAD_SIZE definition is inside a
"#ifndef __ASSEMBLY__" block, so it never gets referenced (because
"__ASSEMBLY__" is defined for the "vmlinux.lds" build).  The obvious
suggested fix is to move the definition outside the block.

--Bob


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[Sam Ravnborg]

On Thu, Oct 29, 2009 at 12:39:47AM -0500, Bob Tracy wrote:

> On Wed, Oct 28, 2009 at 10:53:05PM -0500, Bob Tracy wrote:
> > Mainline 2.6.32-rc5 kernel build failure.  The last few lines of the kernel
> > build output are:
> >
> >   LD      vmlinux.o
> >   MODPOST vmlinux.o
> > WARNING: "saved_config" [vmlinux] is COMMON symbol
> >   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/alpha/kernel/vmlinux.lds:241: undefined symbol `THREAD_SIZE' referenced in expression
> > make: *** [.tmp_vmlinux1] Error 1
>
> > In arch/alpha/include/asm/thread_info.h, THREAD_SIZE is defined as
> > (2*PAGE_SIZE).
>
> Ok.  Found it.  The THREAD_SIZE definition is inside a
> "#ifndef __ASSEMBLY__" block, so it never gets referenced (because
> "__ASSEMBLY__" is defined for the "vmlinux.lds" build).  The obvious
> suggested fix is to move the definition outside the block.

A patch doing this has been posted some time ago.
I think/hope it is in -mm if it is not yet in -linus.

        Sam


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