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Commit e07ac5d1 authored by Vignesh Radhakrishnan's avatar Vignesh Radhakrishnan
Browse files

kmemleak : Make module scanning optional using config 



Currently kmemleak scans module memory as provided
in the area list. This takes up lot of time with
irq's and preemption disabled. Provide a compile
time configurable config to enable this functionality.

Change-Id: I5117705e7e6726acdf492e7f87c0703bc1f28da0
Signed-off-by: default avatarVignesh Radhakrishnan <vigneshr@codeaurora.org>
parent 7f15dd8a

kernel/module.c

+7 −1
Original line number Diff line number Diff line
@@ -2421,7 +2421,13 @@ static void *module_alloc_update_bounds(unsigned long size) 
	return ret;

}



#ifdef CONFIG_DEBUG_KMEMLEAK

#if defined(CONFIG_DEBUG_KMEMLEAK) && defined(CONFIG_DEBUG_MODULE_SCAN_OFF)

static void kmemleak_load_module(const struct module *mod,

				 const struct load_info *info)

{

	kmemleak_no_scan(mod->module_core);

}

#elif defined(CONFIG_DEBUG_KMEMLEAK)

static void kmemleak_load_module(const struct module *mod,

				 const struct load_info *info)

{

lib/Kconfig.debug

+9 −0
Original line number Diff line number Diff line
@@ -553,6 +553,15 @@ config DEBUG_TASK_STACK_SCAN_OFF 
	  writing to the debugfs entry :

	  echo "stack=on" > /sys/kernel/debug/kmemleak.



config DEBUG_MODULE_SCAN_OFF

	bool "Disable module memory scan for leaks by default"

	depends on DEBUG_KMEMLEAK

	help

	  Say Y here to disable scanning kernel modules area list

	  by default for memory leaks. Module scan an potentially

	  run with irq/preemption disabled for considerable amount

	  of time.



config DEBUG_PREEMPT

	bool "Debug preemptible kernel"

	depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT