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Subject[PATCH 06/10] fault injection: rt_mutex_trylock() fault injection
Date
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
---
kernel/locking/rtmutex.c | 26 ++++++++++++++++++++++++++
lib/Kconfig.debug | 6 ++++++
2 files changed, 32 insertions(+)

diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index 1ec0f48..22ff6da 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -10,6 +10,7 @@
*
* See Documentation/locking/rt-mutex-design.txt for details.
*/
+#include <linux/fault-inject.h>
#include <linux/spinlock.h>
#include <linux/export.h>
#include <linux/sched.h>
@@ -1465,6 +1466,28 @@ rt_mutex_timed_lock(struct rt_mutex *lock, struct hrtimer_sleeper *timeout)
}
EXPORT_SYMBOL_GPL(rt_mutex_timed_lock);

+#ifdef CONFIG_FAIL_RT_MUTEX
+DECLARE_FAULT_ATTR(fail_rtmutex);
+
+static int __init fail_rtmutex_debugfs(void)
+{
+ struct dentry *dir = fault_create_debugfs_attr("fail_rtmutex",
+ NULL, &fail_rtmutex);
+ return PTR_ERR_OR_ZERO(dir);
+}
+late_initcall(fail_rtmutex_debugfs);
+
+static inline bool should_fail_rtmutex(struct rt_mutex *lock)
+{
+ return should_fail(&fail_rtmutex, 1);
+}
+#else
+static inline bool should_fail_rtmutex(struct rt_mutex *lock)
+{
+ return false;
+}
+#endif
+
/**
* rt_mutex_trylock - try to lock a rt_mutex
*
@@ -1481,6 +1504,9 @@ int __sched rt_mutex_trylock(struct rt_mutex *lock)
if (WARN_ON_ONCE(in_irq() || in_nmi() || in_serving_softirq()))
return 0;

+ if (should_fail_rtmutex(lock))
+ return 0;
+
return rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock);
}
EXPORT_SYMBOL_GPL(rt_mutex_trylock);
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7e9a9b2e..12ad8eb 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1663,6 +1663,12 @@ config FAIL_MUTEX
help
Provide fault-injection capability for mutex_trylock().

+config FAIL_RT_MUTEX
+ bool "Fault-injection capability for RT mutexes"
+ depends on FAULT_INJECTION && RT_MUTEXES
+ help
+ Provide fault-injection capability for rt_mutex_trylock().
+
config FAULT_INJECTION_DEBUG_FS
bool "Debugfs entries for fault-injection capabilities"
depends on FAULT_INJECTION && SYSFS && DEBUG_FS
--
2.10.0.479.g221bd91
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