Re: [Fastboot] Zero size /proc/vmcore on ia64

["Magnus Damm" <magnus.damm@gmail.com>]

On 2/15/07, Bernhard Walle <bwalle@novell.com> wrote:
> * Horms <horms@verge.net.au> [2007-02-14 02:38]:
> > On Tue, Feb 13, 2007 at 06:03:20PM +0100, Bernhard Walle wrote:
> > > > Index: kexec-tools-bw/kexec/arch/ia64/crashdump-ia64.c
> > > > =================================> > > > --- kexec-tools-bw.orig/kexec/arch/ia64/crashdump-ia64.c  2007-02-13 17:39:18.000000000 +0900
> > > > +++ kexec-tools-bw/kexec/arch/ia64/crashdump-ia64.c       2007-02-13 18:09:44.000000000 +0900
> > > > @@ -232,13 +232,14 @@
> > > >                   if (crash_create_elf64_headers(info, &elf_info,
> > > >                                                  crash_memory_range,
> > > >                                                  nr_ranges,
> > > > -                                                &tmp, &sz) < 0)
> > > > +                                                &tmp, &sz,
> > > > +                                                4096) < 0)
> > >
> > > Why not using EFI_PAGE_SIZE here? It would also be good to find a
> > > suitable constant name for 1024.
> >
> > Indeed, I meant to use EFI_PAGE_SIZE instead of 4096.
> > I'll fix that up and apply.
> >
> > As for a good constant name, I'm open to suggestions.
>
> Hmmm ..., I don't know why there must be an alignment to 1024 on i386
> and x86_64, Vivek?

The following comment explains it pretty well:

-       /*
-        * The kernel command line option memmap= requires 1k granularity,
-        * therefore we align the size to 1024 here.
-        */
-
-       align = 1024;

The comment was unfortunately removed by one of the patches in this
thread, and I think your question is a good proof that we need the
comment. I asked the same thing a few months ago too. =)

/ magnus