kmemleak: Add the base support

This patch adds the base support for the kernel memory leak
detector. It traces the memory allocation/freeing in a way similar to
the Boehm's conservative garbage collector, the difference being that
the unreferenced objects are not freed but only shown in
/sys/kernel/debug/kmemleak. Enabling this feature introduces an
overhead to memory allocations.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/init/main.c b/init/main.c
index bb7dc57eee36..9d759d68d7a0 100644
--- a/init/main.c
+++ b/init/main.c
@@ -56,6 +56,7 @@
 #include <linux/debug_locks.h>
 #include <linux/debugobjects.h>
 #include <linux/lockdep.h>
+#include <linux/kmemleak.h>
 #include <linux/pid_namespace.h>
 #include <linux/device.h>
 #include <linux/kthread.h>
@@ -603,6 +604,7 @@ asmlinkage void __init start_kernel(void)
         /* init some links before init_ISA_irqs() */
         early_irq_init();
         init_IRQ();
+        prio_tree_init();
         pidhash_init();
         init_timers();
         hrtimers_init();
@@ -654,6 +656,7 @@ asmlinkage void __init start_kernel(void)
         cpu_hotplug_init();
         kmem_cache_init();
         kmemtrace_init();
+        kmemleak_init();
         debug_objects_mem_init();
         idr_init_cache();
         setup_per_cpu_pageset();
@@ -663,7 +666,6 @@ asmlinkage void __init start_kernel(void)
         calibrate_delay();
         pidmap_init();
         pgtable_cache_init();
-        prio_tree_init();
         anon_vma_init();
 #ifdef CONFIG_X86
         if (efi_enabled)