From 4ba8216cd90560bc402f52076f64d8546e8aefcb Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 25 Jan 2011 22:52:22 +0100 Subject: [PATCH] BKL: That's all, folks This removes the implementation of the big kernel lock, at last. A lot of people have worked on this in the past, I so the credit for this patch should be with everyone who participated in the hunt. The names on the Cc list are the people that were the most active in this, according to the recorded git history, in alphabetical order. Signed-off-by: Arnd Bergmann Acked-by: Alan Cox Cc: Alessio Igor Bogani Cc: Al Viro Cc: Andrew Hendry Cc: Andrew Morton Cc: Christoph Hellwig Cc: Eric W. Biederman Cc: Frederic Weisbecker Cc: Hans Verkuil Acked-by: Ingo Molnar Cc: Jan Blunck Cc: John Kacur Cc: Jonathan Corbet Cc: Linus Torvalds Cc: Matthew Wilcox Cc: Oliver Neukum Cc: Paul Menage Acked-by: Thomas Gleixner Cc: Trond Myklebust --- include/linux/hardirq.h | 9 +-- include/linux/smp_lock.h | 65 ------------------- init/Kconfig | 5 -- kernel/sched.c | 9 +-- lib/Kconfig.debug | 9 --- lib/Makefile | 1 - lib/kernel_lock.c | 136 --------------------------------------- 7 files changed, 2 insertions(+), 232 deletions(-) delete mode 100644 include/linux/smp_lock.h delete mode 100644 lib/kernel_lock.c diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h index 32f9fd6619b..ba362171e8a 100644 --- a/include/linux/hardirq.h +++ b/include/linux/hardirq.h @@ -93,13 +93,6 @@ */ #define in_nmi() (preempt_count() & NMI_MASK) -#if defined(CONFIG_PREEMPT) && defined(CONFIG_BKL) -# include -# define PREEMPT_INATOMIC_BASE (current->lock_depth >= 0) -#else -# define PREEMPT_INATOMIC_BASE 0 -#endif - #if defined(CONFIG_PREEMPT) # define PREEMPT_CHECK_OFFSET 1 #else @@ -113,7 +106,7 @@ * used in the general case to determine whether sleeping is possible. * Do not use in_atomic() in driver code. */ -#define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_INATOMIC_BASE) +#define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0) /* * Check whether we were atomic before we did preempt_disable(): diff --git a/include/linux/smp_lock.h b/include/linux/smp_lock.h deleted file mode 100644 index 3a198820273..00000000000 --- a/include/linux/smp_lock.h +++ /dev/null @@ -1,65 +0,0 @@ -#ifndef __LINUX_SMPLOCK_H -#define __LINUX_SMPLOCK_H - -#ifdef CONFIG_LOCK_KERNEL -#include - -extern int __lockfunc __reacquire_kernel_lock(void); -extern void __lockfunc __release_kernel_lock(void); - -/* - * Release/re-acquire global kernel lock for the scheduler - */ -#define release_kernel_lock(tsk) do { \ - if (unlikely((tsk)->lock_depth >= 0)) \ - __release_kernel_lock(); \ -} while (0) - -static inline int reacquire_kernel_lock(struct task_struct *task) -{ - if (unlikely(task->lock_depth >= 0)) - return __reacquire_kernel_lock(); - return 0; -} - -extern void __lockfunc -_lock_kernel(const char *func, const char *file, int line) -__acquires(kernel_lock); - -extern void __lockfunc -_unlock_kernel(const char *func, const char *file, int line) -__releases(kernel_lock); - -#define lock_kernel() do { \ - _lock_kernel(__func__, __FILE__, __LINE__); \ -} while (0) - -#define unlock_kernel() do { \ - _unlock_kernel(__func__, __FILE__, __LINE__); \ -} while (0) - -/* - * Various legacy drivers don't really need the BKL in a specific - * function, but they *do* need to know that the BKL became available. - * This function just avoids wrapping a bunch of lock/unlock pairs - * around code which doesn't really need it. - */ -static inline void cycle_kernel_lock(void) -{ - lock_kernel(); - unlock_kernel(); -} - -#else - -#ifdef CONFIG_BKL /* provoke build bug if not set */ -#define lock_kernel() -#define unlock_kernel() -#define cycle_kernel_lock() do { } while(0) -#endif /* CONFIG_BKL */ - -#define release_kernel_lock(task) do { } while(0) -#define reacquire_kernel_lock(task) 0 - -#endif /* CONFIG_LOCK_KERNEL */ -#endif /* __LINUX_SMPLOCK_H */ diff --git a/init/Kconfig b/init/Kconfig index be788c0957d..a88d1c919a4 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -69,11 +69,6 @@ config BROKEN_ON_SMP depends on BROKEN || !SMP default y -config LOCK_KERNEL - bool - depends on (SMP || PREEMPT) && BKL - default y - config INIT_ENV_ARG_LIMIT int default 32 if !UML diff --git a/kernel/sched.c b/kernel/sched.c index 18d38e4ec7b..827c170c601 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -32,7 +32,6 @@ #include #include #include -#include #include #include #include @@ -3945,9 +3944,6 @@ need_resched: rcu_note_context_switch(cpu); prev = rq->curr; - release_kernel_lock(prev); -need_resched_nonpreemptible: - schedule_debug(prev); if (sched_feat(HRTICK)) @@ -4010,9 +4006,6 @@ need_resched_nonpreemptible: post_schedule(rq); - if (unlikely(reacquire_kernel_lock(prev))) - goto need_resched_nonpreemptible; - preempt_enable_no_resched(); if (need_resched()) goto need_resched; @@ -8074,7 +8067,7 @@ static inline int preempt_count_equals(int preempt_offset) { int nested = (preempt_count() & ~PREEMPT_ACTIVE) + rcu_preempt_depth(); - return (nested == PREEMPT_INATOMIC_BASE + preempt_offset); + return (nested == preempt_offset); } void __might_sleep(const char *file, int line, int preempt_offset) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 2b97418c67e..6f440d82b58 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -470,15 +470,6 @@ config DEBUG_MUTEXES This feature allows mutex semantics violations to be detected and reported. -config BKL - bool "Big Kernel Lock" if (SMP || PREEMPT) - default y - help - This is the traditional lock that is used in old code instead - of proper locking. All drivers that use the BKL should depend - on this symbol. - Say Y here unless you are working on removing the BKL. - config DEBUG_LOCK_ALLOC bool "Lock debugging: detect incorrect freeing of live locks" depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT diff --git a/lib/Makefile b/lib/Makefile index cbb774f7d41..de6c609bb4e 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -43,7 +43,6 @@ obj-$(CONFIG_GENERIC_FIND_LAST_BIT) += find_last_bit.o CFLAGS_hweight.o = $(subst $(quote),,$(CONFIG_ARCH_HWEIGHT_CFLAGS)) obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o -obj-$(CONFIG_LOCK_KERNEL) += kernel_lock.o obj-$(CONFIG_BTREE) += btree.o obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o obj-$(CONFIG_DEBUG_LIST) += list_debug.o diff --git a/lib/kernel_lock.c b/lib/kernel_lock.c deleted file mode 100644 index d80e1226586..00000000000 --- 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 -#include -#include -#include - -/* - * 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); -