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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: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2007-02-20 13:57:56 -08:00 committed by Linus Torvalds
parent 94412a96c4
commit 1df49008f4
2 changed files with 29 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
lib/Kconfig.debug
View File

@ -411,8 +411,6 @@ config LKDTM
config FAULT_INJECTION
bool "Fault-injection framework"
depends on DEBUG_KERNEL
depends on STACKTRACE
select FRAME_POINTER
help
Provide fault-injection framework.
For more details, see Documentation/fault-injection/.
@ -440,3 +438,11 @@ config FAULT_INJECTION_DEBUG_FS
depends on FAULT_INJECTION && SYSFS && DEBUG_FS
help
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

41
lib/fault-inject.c
View File

@ -55,7 +55,7 @@ static bool fail_task(struct fault_attr *attr, struct task_struct *task)
#define MAX_STACK_TRACE_DEPTH 32
#if defined(CONFIG_STACKTRACE)
#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
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 bool firsttime = true;
if (firsttime) {
printk(KERN_WARNING
"This architecture does not implement save_stack_trace()\n");
firsttime = false;
}
return false;
return true;
}
#endif
#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
/*
* 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);
attr->dentries.task_filter_file = NULL;
#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
debugfs_remove(attr->dentries.stacktrace_depth_file);
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);
attr->dentries.reject_end_file = NULL;
#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
if (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",
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 =
debugfs_create_ul_MAX_STACK_TRACE_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 =
debugfs_create_ul("reject-end", mode, dir, &attr->reject_end);
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
|| !attr->dentries.stacktrace_depth_file
|| !attr->dentries.require_start_file
|| !attr->dentries.require_end_file
|| !attr->dentries.reject_start_file
|| !attr->dentries.reject_end_file
)
if (!attr->dentries.stacktrace_depth_file ||
!attr->dentries.require_start_file ||
!attr->dentries.require_end_file ||
!attr->dentries.reject_start_file ||
!attr->dentries.reject_end_file)
goto fail;
#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
return 0;
fail:
cleanup_fault_attr_dentries(attr);