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 as examples. Other architecture can provide followup patches later on. Christian Borntraeger (3): mm: provide debug_pagealloc_enabled() without CONFIG_DEBUG_PAGEALLOC x86: query dynamic DEBUG_PAGEALLOC setting s390: query dynamic DEBUG_PAGEALLOC setting arch/s390/kernel/dumpstack.c | 4 +++- arch/s390/mm/vmem.c | 10 ++++------ arch/x86/kernel/dumpstack.c | 4 +++- arch/x86/mm/init.c | 7 ++++--- arch/x86/mm/pageattr.c | 14 ++++---------- include/linux/mm.h | 4 ++++ 6 files changed, 22 insertions(+), 21 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>