[PATCH v4 0/4 (resend)] Optimize CONFIG_DEBUG_PAGEALLOC (x86 and s390)

[Christian Borntraeger]

Andrew, here is a resend as these patches were dropped as I also 
had them on my linux-next branch (instead of a private one)

As CONFIG_DEBUG_PAGEALLOC can be enabled/disabled via kernel
parameters we can optimize some cases by checking the enablement
state.

I have done s390 and x86. Other architecture can follow as necessary.

Christian Borntraeger (4):
  mm: provide debug_pagealloc_enabled() without CONFIG_DEBUG_PAGEALLOC
  x86: query dynamic DEBUG_PAGEALLOC setting
  s390: query dynamic DEBUG_PAGEALLOC setting
  x86: also use debug_pagealloc_enabled() for free_init_pages

 arch/s390/kernel/dumpstack.c |  6 +++---
 arch/s390/mm/vmem.c          | 10 ++++------
 arch/x86/kernel/dumpstack.c  |  5 ++---
 arch/x86/mm/init.c           | 36 +++++++++++++++++++-----------------
 arch/x86/mm/pageattr.c       | 14 ++++----------
 include/linux/mm.h           |  9 +++++++--
 6 files changed, 39 insertions(+), 41 deletions(-)

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2.3.0