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(-) -- 2.3.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>