[PATCH] IA64: kexec allocates too few memory for kdump kernel itself

[Jay Lan]

Sometimes the kexec would allocate not enough memory for kdump kernel
itself on IA64 and caused kdump kernel to panic at boot.

When it happens, the /proc/iomem would show a kernel RAM segment like
this:
3014000000-3015294fff : System RAM
  3014000000-3014823ccf : Kernel code
  3014823cd0-3014dee8ef : Kernel data
  3014dee8f0-301529448f : Kernel bss
3015295000-307bffdfff : System RAM
  3018000000-3037ffffff : Crash kernel

But kexec would allocate memory 3018000000-3019290000 for the kernel,
which is 0x5000 smaller than the regular kernel. In my cases, the
physical_node_map and kern_memmap of the kdump kernel overlaped and
caused data corruption.

This patch fixes the problem. The patch was generated against
kexec-tools 2.0.0 and tested in 2.6.27-rc4.

Signed-off-by: Jay Lan <jlan at sgi.com>

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