One of the enhancements I made to the PAGE_OWNER code was to make it use the generic stack trace support. However, there are some architectures that do not support it, like m68k. So, make PAGE_OWNER also depend on having STACKTRACE_SUPPORT. This isn't ideal since it restricts the number of places PAGE_OWNER runs now, but it at least hits all the major architectures. tree: git://git.cmpxchg.org/linux-mmotm.git master head: 83b324c5ff5cca85bbeb2ba913d465f108afe472 commit: 2a561c9d47c295ed91984c2b916a4dd450ee0279 [484/499] debugging-keep-track-of-page-owners-fix config: make ARCH=m68k allmodconfig All warnings: warning: (PAGE_OWNER && STACK_TRACER && BLK_DEV_IO_TRACE && KMEMCHECK) selects STACKTRACE which has unmet direct dependencies (STACKTRACE_SUPPORT) Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx> Signed-off-by: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> --- linux-2.6.git-dave/lib/Kconfig.debug | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN lib/Kconfig.debug~now-depends-on-STACKTRACE_SUPPORT lib/Kconfig.debug --- linux-2.6.git/lib/Kconfig.debug~now-depends-on-STACKTRACE_SUPPORT 2013-02-06 09:44:01.372619511 -0800 +++ linux-2.6.git-dave/lib/Kconfig.debug 2013-02-06 09:44:10.648711604 -0800 @@ -101,7 +101,7 @@ config UNUSED_SYMBOLS config PAGE_OWNER bool "Track page owner" - depends on DEBUG_KERNEL + depends on DEBUG_KERNEL && STACKTRACE_SUPPORT select DEBUG_FS select STACKTRACE help _ -- 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>