kdump, vmcoreinfo: Export pgtable_l5_enabled value

User-space utilities examining crash-kernels need to know if the
crashed kernel was in 5-level paging mode or not.

So write 'pgtable_l5_enabled' to vmcoreinfo, which covers these
three cases:

  pgtable_l5_enabled == 0 when:
   - Compiled with !CONFIG_X86_5LEVEL
   - Compiled with CONFIG_X86_5LEVEL=y while CPU has no 'la57' flag

  pgtable_l5_enabled != 0 when:
   - Compiled with CONFIG_X86_5LEVEL=y and CPU has 'la57' flag

Signed-off-by: Baoquan He <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions