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Commit 1df49008 authored by Akinobu Mita's avatar Akinobu Mita Committed by Linus Torvalds
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[PATCH] fault injection: split up stacktrace filter Kconfig option 



There is no prompt for CONFIG_STACKTRACE, so FAULT_INJECTION cannot be
selected without LOCKDEP enabled.  (found by Paolo 'Blaisorblade'
Giarrusso)

In order to fix such broken Kconfig dependency, this patch splits up the
stacktrace filter support for fault injection by new Kconfig option, which
enables to use fault injection on the architecture which doesn't have
general stacktrace support.

Cc: "Paolo 'Blaisorblade' Giarrusso" <blaisorblade@yahoo.it>
Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 94412a96

lib/Kconfig.debug

+8 −2
Original line number Original line Diff line number Diff line
@@ -411,8 +411,6 @@ config LKDTM 
config FAULT_INJECTION

config FAULT_INJECTION

	bool "Fault-injection framework"

	bool "Fault-injection framework"

	depends on DEBUG_KERNEL

	depends on DEBUG_KERNEL

	depends on STACKTRACE

	select FRAME_POINTER

	help

	help

	  Provide fault-injection framework.

	  Provide fault-injection framework.

	  For more details, see Documentation/fault-injection/.

	  For more details, see Documentation/fault-injection/.
@@ -440,3 +438,11 @@ config FAULT_INJECTION_DEBUG_FS 
	depends on FAULT_INJECTION && SYSFS && DEBUG_FS

	depends on FAULT_INJECTION && SYSFS && DEBUG_FS

	help

	help

	  Enable configuration of fault-injection capabilities via debugfs.

	  Enable configuration of fault-injection capabilities via debugfs.



config FAULT_INJECTION_STACKTRACE_FILTER

	bool "stacktrace filter for fault-injection capabilities"

	depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT

	select STACKTRACE

	select FRAME_POINTER

	help

	  Provide stacktrace filter for fault-injection capabilities

lib/fault-inject.c

+21 −20
Original line number Original line Diff line number Diff line
@@ -55,7 +55,7 @@ static bool fail_task(struct fault_attr *attr, struct task_struct *task) 




#define MAX_STACK_TRACE_DEPTH 32

#define MAX_STACK_TRACE_DEPTH 32





#if defined(CONFIG_STACKTRACE)

#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER





static bool fail_stacktrace(struct fault_attr *attr)

static bool fail_stacktrace(struct fault_attr *attr)

{

{
@@ -90,17 +90,10 @@ static bool fail_stacktrace(struct fault_attr *attr) 




static inline bool fail_stacktrace(struct fault_attr *attr)

static inline bool fail_stacktrace(struct fault_attr *attr)

{

{

	static bool firsttime = true;

	return true;



	if (firsttime) {

		printk(KERN_WARNING

		"This architecture does not implement save_stack_trace()\n");

		firsttime = false;

	}

	return false;

}

}





#endif

#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */





/*

/*

 * This code is stolen from failmalloc-1.0

 * This code is stolen from failmalloc-1.0
@@ -217,6 +210,8 @@ void cleanup_fault_attr_dentries(struct fault_attr *attr) 
	debugfs_remove(attr->dentries.task_filter_file);

	debugfs_remove(attr->dentries.task_filter_file);

	attr->dentries.task_filter_file = NULL;

	attr->dentries.task_filter_file = NULL;





#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER



	debugfs_remove(attr->dentries.stacktrace_depth_file);

	debugfs_remove(attr->dentries.stacktrace_depth_file);

	attr->dentries.stacktrace_depth_file = NULL;

	attr->dentries.stacktrace_depth_file = NULL;
@@ -232,6 +227,8 @@ void cleanup_fault_attr_dentries(struct fault_attr *attr) 
	debugfs_remove(attr->dentries.reject_end_file);

	debugfs_remove(attr->dentries.reject_end_file);

	attr->dentries.reject_end_file = NULL;

	attr->dentries.reject_end_file = NULL;





#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */



	if (attr->dentries.dir)

	if (attr->dentries.dir)

		WARN_ON(!simple_empty(attr->dentries.dir));

		WARN_ON(!simple_empty(attr->dentries.dir));
@@ -269,6 +266,13 @@ int init_fault_attr_dentries(struct fault_attr *attr, const char *name) 
	attr->dentries.task_filter_file = debugfs_create_bool("task-filter",

	attr->dentries.task_filter_file = debugfs_create_bool("task-filter",

						mode, dir, &attr->task_filter);

						mode, dir, &attr->task_filter);





	if (!attr->dentries.probability_file || !attr->dentries.interval_file ||

	    !attr->dentries.times_file || !attr->dentries.space_file ||

	    !attr->dentries.verbose_file || !attr->dentries.task_filter_file)

		goto fail;



#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER



	attr->dentries.stacktrace_depth_file =

	attr->dentries.stacktrace_depth_file =

		debugfs_create_ul_MAX_STACK_TRACE_DEPTH(

		debugfs_create_ul_MAX_STACK_TRACE_DEPTH(

			"stacktrace-depth", mode, dir, &attr->stacktrace_depth);

			"stacktrace-depth", mode, dir, &attr->stacktrace_depth);
@@ -285,18 +289,15 @@ int init_fault_attr_dentries(struct fault_attr *attr, const char *name) 
	attr->dentries.reject_end_file =

	attr->dentries.reject_end_file =

		debugfs_create_ul("reject-end", mode, dir, &attr->reject_end);

		debugfs_create_ul("reject-end", mode, dir, &attr->reject_end);







	if (!attr->dentries.stacktrace_depth_file ||

	if (!attr->dentries.probability_file || !attr->dentries.interval_file

	    !attr->dentries.require_start_file ||

	    || !attr->dentries.times_file || !attr->dentries.space_file

	    !attr->dentries.require_end_file ||

	    || !attr->dentries.verbose_file || !attr->dentries.task_filter_file

	    !attr->dentries.reject_start_file ||

	    || !attr->dentries.stacktrace_depth_file

	    !attr->dentries.reject_end_file)

	    || !attr->dentries.require_start_file

	    || !attr->dentries.require_end_file

	    || !attr->dentries.reject_start_file

	    || !attr->dentries.reject_end_file

	    )

		goto fail;

		goto fail;





#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */



	return 0;

	return 0;

fail:

fail:

	cleanup_fault_attr_dentries(attr);

	cleanup_fault_attr_dentries(attr);