x86: add code to dump the (kernel) page tables for visual inspection by kernel developers

This patch adds code to the kernel to have an (optional)
/proc/kernel_page_tables debug file that basically dumps the kernel
pagetables; this allows us kernel developers to verify that nothing fishy is
going on and that the various mappings are set up correctly. This was quite
useful in finding various change_page_attr() bugs, and is very likely to be
useful in the future as well.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: mingo@elte.hu
Cc: tglx@tglx.de
Cc: hpa@zytor.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index 8e81660604bc..28632f42ca66 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -12,4 +12,5 @@ else
 obj-$(CONFIG_NUMA)              += numa_64.o
 obj-$(CONFIG_K8_NUMA)           += k8topology_64.o
 obj-$(CONFIG_ACPI_NUMA)         += srat_64.o
+obj-$(CONFIG_X86_PTDUMP)        += dump_pagetables.o
 endif