Re: 2.6.21-rc7-mm1 on test.kernel.org

[Andrew Morton <akpm@linux-foundation.org>]

On Tue, 24 Apr 2007 13:32:32 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:

> On Tue, 24 Apr 2007, Andrew Morton wrote:
> 
> > On Tue, 24 Apr 2007 13:21:25 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:
> > 
> > > On Tue, 24 Apr 2007, Andrew Morton wrote:
> > > 
> > > > Naturally, I can't reproduce it (no amd64 boxen).  A bisection search would
> > > > be wonderful.
> > > 
> > > Cannot compile a UP x86_64 kernel
> > > 
> > >   LD      arch/x86_64/kernel/pcspeaker.o
> > >   LD      arch/x86_64/kernel/built-in.o
> > >   AS      arch/x86_64/kernel/head.o
> > >   CC      arch/x86_64/kernel/head64.o
> > > arch/x86_64/kernel/head64.c: In function 'x86_64_start_kernel':
> > > arch/x86_64/kernel/head64.c:70: error: size of array 'type name' is 
> > > negative
> > 
> > That's a BUILD_BUG_ON.  Check the source...
> > 
> > 
> > 	/*
> > 	 * Make sure kernel is aligned to 2MB address. Catching it at compile
> > 	 * time is better. Change your config file and compile the kernel
> > 	 * for a 2MB aligned address (CONFIG_PHYSICAL_START)
> > 	 */
> > 	BUILD_BUG_ON(CONFIG_PHYSICAL_START & (__KERNEL_ALIGN - 1));
> > 
> > You need to change your CONFIG_PHYSICAL_START so it is a multiple of 2MB.
> 
> ???? My old .config wont work anymore.

kexec requries 2MB alignment.  I think your old config would have just
crashed.  Now you got told about it at compile time.


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