[PATCH 0/2] Kexec_file: Load kernel at top of system ram

[Baoquan He]

The current kexec_file ignores kexec_buf.top_down value when call
arch_kexec_walk_mem() to allocate memory for loading kernel/initrd
stuffs. This is not supposed to be what kexec_buf.top_down is used
for.

In patch 0001, introduce a new function walk_system_ram_res_rev()
which is a variant of walk_system_ram_res(), walks through resources
of System RAM from top to down. And patch 0001 is picked from AKASHI's
patchset which adds arm64 kexec_file support. His next round of post
won't need walk_system_ram_res_rev any more, so I take it into this
patchset and use it in patch 0002.

In patch 0002, check kexec_buf.top_down in arch_kexec_walk_mem(),
if its value is 'true', call walk_system_ram_res_rev(). Otherwise
call walk_system_ram_res().

AKASHI Takahiro (1):
  resource: add walk_system_ram_res_rev()

Baoquan He (1):
  kexec_file: Load kernel at top of system RAM if required

 include/linux/ioport.h |  3 +++
 kernel/kexec_file.c    |  2 ++
 kernel/resource.c      | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+)

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2.13.6