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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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