1 files changed, 0 insertions, 136 deletions

diff --git a/lib/kernel_lock.c b/lib/kernel_lock.c
deleted file mode 100644
index d80e12265862..000000000000
--- a/lib/kernel_lock.c
+++ /dev/null
@@ -1,136 +0,0 @@
-/*
- * lib/kernel_lock.c
- *
- * This is the traditional BKL - big kernel lock. Largely
- * relegated to obsolescence, but used by various less
- * important (or lazy) subsystems.
- */
-#include <linux/module.h>
-#include <linux/kallsyms.h>
-#include <linux/semaphore.h>
-#include <linux/smp_lock.h>
-
-/*
- * The 'big kernel lock'
- *
- * This spinlock is taken and released recursively by lock_kernel()
- * and unlock_kernel().  It is transparently dropped and reacquired
- * over schedule().  It is used to protect legacy code that hasn't
- * been migrated to a proper locking design yet.
- *
- * Don't use in new code.
- */
-static  __cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(kernel_flag);
-
-
-/*
- * Acquire/release the underlying lock from the scheduler.
- *
- * This is called with preemption disabled, and should
- * return an error value if it cannot get the lock and
- * TIF_NEED_RESCHED gets set.
- *
- * If it successfully gets the lock, it should increment
- * the preemption count like any spinlock does.
- *
- * (This works on UP too - do_raw_spin_trylock will never
- * return false in that case)
- */
-int __lockfunc __reacquire_kernel_lock(void)
-{
-        while (!do_raw_spin_trylock(&kernel_flag)) {
-                if (need_resched())
-                        return -EAGAIN;
-                cpu_relax();
-        }
-        preempt_disable();
-        return 0;
-}
-
-void __lockfunc __release_kernel_lock(void)
-{
-        do_raw_spin_unlock(&kernel_flag);
-        preempt_enable_no_resched();
-}
-
-/*
- * These are the BKL spinlocks - we try to be polite about preemption.
- * If SMP is not on (ie UP preemption), this all goes away because the
- * do_raw_spin_trylock() will always succeed.
- */
-#ifdef CONFIG_PREEMPT
-static inline void __lock_kernel(void)
-{
-        preempt_disable();
-        if (unlikely(!do_raw_spin_trylock(&kernel_flag))) {
-                /*
-                 * If preemption was disabled even before this
-                 * was called, there's nothing we can be polite
-                 * about - just spin.
-                 */
-                if (preempt_count() > 1) {
-                        do_raw_spin_lock(&kernel_flag);
-                        return;
-                }
-
-                /*
-                 * Otherwise, let's wait for the kernel lock
-                 * with preemption enabled..
-                 */
-                do {
-                        preempt_enable();
-                        while (raw_spin_is_locked(&kernel_flag))
-                                cpu_relax();
-                        preempt_disable();
-                } while (!do_raw_spin_trylock(&kernel_flag));
-        }
-}
-
-#else
-
-/*
- * Non-preemption case - just get the spinlock
- */
-static inline void __lock_kernel(void)
-{
-        do_raw_spin_lock(&kernel_flag);
-}
-#endif
-
-static inline void __unlock_kernel(void)
-{
-        /*
-         * the BKL is not covered by lockdep, so we open-code the
-         * unlocking sequence (and thus avoid the dep-chain ops):
-         */
-        do_raw_spin_unlock(&kernel_flag);
-        preempt_enable();
-}
-
-/*
- * Getting the big kernel lock.
- *
- * This cannot happen asynchronously, so we only need to
- * worry about other CPU's.
- */
-void __lockfunc _lock_kernel(const char *func, const char *file, int line)
-{
-        int depth = current->lock_depth + 1;
-
-        if (likely(!depth)) {
-                might_sleep();
-                __lock_kernel();
-        }
-        current->lock_depth = depth;
-}
-
-void __lockfunc _unlock_kernel(const char *func, const char *file, int line)
-{
-        BUG_ON(current->lock_depth < 0);
-        if (likely(--current->lock_depth < 0))
-                __unlock_kernel();
-}
-
-EXPORT_SYMBOL(_lock_kernel);
-EXPORT_SYMBOL(_unlock_kernel);
-