Messages in this thread Patch in this message |  | | Date | Fri, 23 Aug 2002 13:31:02 +0200 | From | Christoph Hellwig <> | Subject | [BKPATCH] further BKL cleanups |
| |
Now that we have <asm-*/smplock.h> remove and everything in <linux/smp_lock.h> we can move the definition/export of kernel_flag to common code. Also cleanup smp_lock.h a little more.
You can import this changeset into BK by piping this whole message to: '| bk receive [path to repository]' or apply the patch as usual.
===================================================================
ChangeSet@1.509, 2002-08-23 13:56:54+02:00, hch@sb.bsdonline.org Cleanup BKL handling and move kernel_flag definition to common code
arch/alpha/kernel/alpha_ksyms.c | 2 - arch/alpha/kernel/smp.c | 2 - arch/arm/kernel/armksyms.c | 4 -- arch/arm/kernel/setup.c | 4 -- arch/i386/kernel/i386_ksyms.c | 1 arch/i386/kernel/smp.c | 4 -- arch/ia64/kernel/ia64_ksyms.c | 4 -- arch/ia64/kernel/smp.c | 8 ---- arch/mips/kernel/smp.c | 1 arch/mips64/kernel/smp.c | 1 arch/parisc/kernel/parisc_ksyms.c | 3 - arch/ppc/kernel/ppc_ksyms.c | 3 - arch/ppc/kernel/smp.c | 1 arch/ppc64/kernel/ppc_ksyms.c | 1 arch/ppc64/kernel/smp.c | 1 arch/s390/kernel/smp.c | 3 - arch/s390x/kernel/smp.c | 3 - arch/sparc/kernel/smp.c | 3 - arch/sparc/kernel/sparc_ksyms.c | 7 ---- arch/sparc64/kernel/smp.c | 3 - arch/sparc64/kernel/sparc64_ksyms.c | 8 ---- arch/x86_64/kernel/smp.c | 3 - arch/x86_64/kernel/x8664_ksyms.c | 1 include/linux/smp_lock.h | 61 ++++++++++++++++-------------------- kernel/ksyms.c | 4 ++ kernel/sched.c | 15 ++++++++ 26 files changed, 48 insertions, 103 deletions
diff -Nru a/arch/alpha/kernel/alpha_ksyms.c b/arch/alpha/kernel/alpha_ksyms.c --- a/arch/alpha/kernel/alpha_ksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/alpha/kernel/alpha_ksyms.c Fri Aug 23 14:19:06 2002 @@ -40,7 +40,6 @@ extern struct hwrpb_struct *hwrpb; extern void dump_thread(struct pt_regs *, struct user *); extern int dump_fpu(struct pt_regs *, elf_fpregset_t *); -extern spinlock_t kernel_flag; extern spinlock_t rtc_lock; /* these are C runtime functions with special calling conventions: */ @@ -207,7 +206,6 @@ */ #ifdef CONFIG_SMP -EXPORT_SYMBOL(kernel_flag); EXPORT_SYMBOL(synchronize_irq); EXPORT_SYMBOL(flush_tlb_all); EXPORT_SYMBOL(flush_tlb_mm); diff -Nru a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c --- a/arch/alpha/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/alpha/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -67,8 +67,6 @@ IPI_CPU_STOP, }; -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; - /* Set to a secondary's cpuid when it comes online. */ static int smp_secondary_alive __initdata = 0; diff -Nru a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c --- a/arch/arm/kernel/armksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/arm/kernel/armksyms.c Fri Aug 23 14:19:06 2002 @@ -273,7 +273,3 @@ EXPORT_SYMBOL_NOVERS(__up_wakeup); EXPORT_SYMBOL(get_wchan); - -#ifdef CONFIG_PREEMPT -EXPORT_SYMBOL(kernel_flag); -#endif diff -Nru a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c --- a/arch/arm/kernel/setup.c Fri Aug 23 14:19:06 2002 +++ b/arch/arm/kernel/setup.c Fri Aug 23 14:19:06 2002 @@ -36,10 +36,6 @@ #define MEM_SIZE (16*1024*1024) #endif -#ifdef CONFIG_PREEMPT -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; -#endif - #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE) char fpe_type[8]; diff -Nru a/arch/i386/kernel/i386_ksyms.c b/arch/i386/kernel/i386_ksyms.c --- a/arch/i386/kernel/i386_ksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/i386/kernel/i386_ksyms.c Fri Aug 23 14:19:06 2002 @@ -126,7 +126,6 @@ #ifdef CONFIG_SMP EXPORT_SYMBOL(cpu_data); -EXPORT_SYMBOL(kernel_flag); EXPORT_SYMBOL(cpu_online_map); EXPORT_SYMBOL_NOVERS(__write_lock_failed); EXPORT_SYMBOL_NOVERS(__read_lock_failed); diff -Nru a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c --- a/arch/i386/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/i386/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -18,6 +18,7 @@ #include <linux/kernel_stat.h> #include <linux/mc146818rtc.h> #include <linux/cache.h> +#include <linux/interrupt.h> #include <asm/mtrr.h> #include <asm/pgalloc.h> @@ -102,9 +103,6 @@ * or are signal timing bugs worked around in hardware and there's * about nothing of note with C stepping upwards. */ - -/* The 'big kernel lock' */ -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; struct tlb_state cpu_tlbstate[NR_CPUS] __cacheline_aligned = {[0 ... NR_CPUS-1] = { &init_mm, 0, }}; diff -Nru a/arch/ia64/kernel/ia64_ksyms.c b/arch/ia64/kernel/ia64_ksyms.c --- a/arch/ia64/kernel/ia64_ksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/ia64/kernel/ia64_ksyms.c Fri Aug 23 14:19:06 2002 @@ -84,10 +84,6 @@ EXPORT_SYMBOL(smp_call_function_single); EXPORT_SYMBOL(cpu_online_map); EXPORT_SYMBOL(ia64_cpu_to_sapicid); - -#include <asm/smplock.h> -EXPORT_SYMBOL(kernel_flag); - #else /* !CONFIG_SMP */ EXPORT_SYMBOL(__flush_tlb_all); diff -Nru a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c --- a/arch/ia64/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/ia64/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -53,14 +53,6 @@ #include <asm/mca.h> /* - * The Big Kernel Lock. It's not supposed to be used for performance critical stuff - * anymore. But we still need to align it because certain workloads are still affected by - * it. For example, llseek() and various other filesystem related routines still use the - * BKL. - */ -spinlock_t kernel_flag __cacheline_aligned = SPIN_LOCK_UNLOCKED; - -/* * Structure and data for smp_call_function(). This is designed to minimise static memory * requirements. It also looks cleaner. */ diff -Nru a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c --- a/arch/mips/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/mips/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -53,7 +53,6 @@ /* Ze Big Kernel Lock! */ -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; int smp_threads_ready; /* Not used */ int smp_num_cpus; int global_irq_holder = NO_PROC_ID; diff -Nru a/arch/mips64/kernel/smp.c b/arch/mips64/kernel/smp.c --- a/arch/mips64/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/mips64/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -53,7 +53,6 @@ #endif /* CONFIG_SGI_IP27 */ /* The 'big kernel lock' */ -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; int smp_threads_ready; /* Not used */ atomic_t smp_commenced = ATOMIC_INIT(0); struct cpuinfo_mips cpu_data[NR_CPUS]; diff -Nru a/arch/parisc/kernel/parisc_ksyms.c b/arch/parisc/kernel/parisc_ksyms.c --- a/arch/parisc/kernel/parisc_ksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/parisc/kernel/parisc_ksyms.c Fri Aug 23 14:19:06 2002 @@ -35,9 +35,6 @@ #ifdef CONFIG_SMP EXPORT_SYMBOL(synchronize_irq); -#include <asm/smplock.h> -EXPORT_SYMBOL(kernel_flag); - #include <asm/system.h> EXPORT_SYMBOL(__global_sti); EXPORT_SYMBOL(__global_cli); diff -Nru a/arch/ppc/kernel/ppc_ksyms.c b/arch/ppc/kernel/ppc_ksyms.c --- a/arch/ppc/kernel/ppc_ksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/ppc/kernel/ppc_ksyms.c Fri Aug 23 14:19:06 2002 @@ -93,9 +93,6 @@ EXPORT_SYMBOL(disable_irq); EXPORT_SYMBOL(disable_irq_nosync); EXPORT_SYMBOL(probe_irq_mask); -#ifdef CONFIG_SMP -EXPORT_SYMBOL(kernel_flag); -#endif /* CONFIG_SMP */ EXPORT_SYMBOL(ISA_DMA_THRESHOLD); EXPORT_SYMBOL_NOVERS(DMA_MODE_READ); diff -Nru a/arch/ppc/kernel/smp.c b/arch/ppc/kernel/smp.c --- a/arch/ppc/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/ppc/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -47,7 +47,6 @@ struct klock_info_struct klock_info = { KLOCK_CLEAR, 0 }; atomic_t ipi_recv; atomic_t ipi_sent; -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; unsigned int prof_multiplier[NR_CPUS] = { [1 ... NR_CPUS-1] = 1 }; unsigned int prof_counter[NR_CPUS] = { [1 ... NR_CPUS-1] = 1 }; unsigned long cache_decay_ticks = HZ/100; diff -Nru a/arch/ppc64/kernel/ppc_ksyms.c b/arch/ppc64/kernel/ppc_ksyms.c --- a/arch/ppc64/kernel/ppc_ksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/ppc64/kernel/ppc_ksyms.c Fri Aug 23 14:19:06 2002 @@ -74,7 +74,6 @@ EXPORT_SYMBOL(disable_irq_nosync); #ifdef CONFIG_SMP EXPORT_SYMBOL(synchronize_irq); -EXPORT_SYMBOL(kernel_flag); #endif /* CONFIG_SMP */ EXPORT_SYMBOL(register_ioctl32_conversion); diff -Nru a/arch/ppc64/kernel/smp.c b/arch/ppc64/kernel/smp.c --- a/arch/ppc64/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/ppc64/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -51,7 +51,6 @@ #include <asm/machdep.h> int smp_threads_ready = 0; -spinlock_t kernel_flag __cacheline_aligned = SPIN_LOCK_UNLOCKED; unsigned long cache_decay_ticks; /* initialised so it doesnt end up in bss */ diff -Nru a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c --- a/arch/s390/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/s390/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -54,8 +54,6 @@ int smp_threads_ready=0; /* Set when the idlers are all forked. */ static atomic_t smp_commenced = ATOMIC_INIT(0); -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; - volatile unsigned long phys_cpu_present_map; volatile unsigned long cpu_online_map; unsigned long cache_decay_ticks = 0; @@ -634,7 +632,6 @@ } EXPORT_SYMBOL(lowcore_ptr); -EXPORT_SYMBOL(kernel_flag); EXPORT_SYMBOL(smp_ctl_set_bit); EXPORT_SYMBOL(smp_ctl_clear_bit); EXPORT_SYMBOL(smp_num_cpus); diff -Nru a/arch/s390x/kernel/smp.c b/arch/s390x/kernel/smp.c --- a/arch/s390x/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/s390x/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -53,8 +53,6 @@ int smp_threads_ready=0; /* Set when the idlers are all forked. */ static atomic_t smp_commenced = ATOMIC_INIT(0); -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; - volatile unsigned long phys_cpu_present_map; volatile unsigned long cpu_online_map; unsigned long cache_decay_ticks = 0; @@ -613,7 +611,6 @@ } EXPORT_SYMBOL(lowcore_ptr); -EXPORT_SYMBOL(kernel_flag); EXPORT_SYMBOL(smp_ctl_set_bit); EXPORT_SYMBOL(smp_ctl_clear_bit); EXPORT_SYMBOL(smp_num_cpus); diff -Nru a/arch/sparc/kernel/smp.c b/arch/sparc/kernel/smp.c --- a/arch/sparc/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/sparc/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -66,9 +66,6 @@ * instruction which is much better... */ -/* Kernel spinlock */ -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; - /* Used to make bitops atomic */ unsigned char bitops_spinlock = 0; diff -Nru a/arch/sparc/kernel/sparc_ksyms.c b/arch/sparc/kernel/sparc_ksyms.c --- a/arch/sparc/kernel/sparc_ksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/sparc/kernel/sparc_ksyms.c Fri Aug 23 14:19:06 2002 @@ -77,10 +77,6 @@ extern void dump_thread(struct pt_regs *, struct user *); -#ifdef CONFIG_SMP -extern spinlock_t kernel_flag; -#endif - /* One thing to note is that the way the symbols of the mul/div * support routines are named is a mess, they all start with * a '.' which makes it a bitch to export, here is the trick: @@ -130,9 +126,6 @@ EXPORT_SYMBOL_PRIVATE(_change_bit); #ifdef CONFIG_SMP -/* Kernel wide locking */ -EXPORT_SYMBOL(kernel_flag); - /* IRQ implementation. */ EXPORT_SYMBOL(global_irq_holder); EXPORT_SYMBOL(synchronize_irq); diff -Nru a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c --- a/arch/sparc64/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/sparc64/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -46,9 +46,6 @@ /* Please don't make this stuff initdata!!! --DaveM */ static unsigned char boot_cpu_id; -/* Kernel spinlock */ -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; - atomic_t sparc64_num_cpus_online = ATOMIC_INIT(0); unsigned long cpu_online_map = 0; atomic_t sparc64_num_cpus_possible = ATOMIC_INIT(0); diff -Nru a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c --- a/arch/sparc64/kernel/sparc64_ksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/sparc64/kernel/sparc64_ksyms.c Fri Aug 23 14:19:06 2002 @@ -101,9 +101,7 @@ extern void dump_thread(struct pt_regs *, struct user *); extern int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs); -#ifdef CONFIG_SMP -extern spinlock_t kernel_flag; -#ifdef CONFIG_DEBUG_SPINLOCK +#if defined(CONFIG_SMP) && defined(CONFIG_DEBUG_SPINLOCK) extern void _do_spin_lock (spinlock_t *lock, char *str); extern void _do_spin_unlock (spinlock_t *lock); extern int _spin_trylock (spinlock_t *lock); @@ -112,7 +110,6 @@ extern void _do_write_lock(rwlock_t *rw, char *str); extern void _do_write_unlock(rwlock_t *rw); #endif -#endif extern unsigned long phys_base; extern unsigned long pfn_base; @@ -126,9 +123,6 @@ EXPORT_SYMBOL(__write_lock); EXPORT_SYMBOL(__write_unlock); #endif - -/* Kernel wide locking */ -EXPORT_SYMBOL(kernel_flag); /* Hard IRQ locking */ #ifdef CONFIG_SMP diff -Nru a/arch/x86_64/kernel/smp.c b/arch/x86_64/kernel/smp.c --- a/arch/x86_64/kernel/smp.c Fri Aug 23 14:19:06 2002 +++ b/arch/x86_64/kernel/smp.c Fri Aug 23 14:19:06 2002 @@ -22,9 +22,6 @@ #include <asm/pgalloc.h> #include <asm/tlbflush.h> -/* The 'big kernel lock' */ -spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; - /* * the following functions deal with sending IPIs between CPUs. * diff -Nru a/arch/x86_64/kernel/x8664_ksyms.c b/arch/x86_64/kernel/x8664_ksyms.c --- a/arch/x86_64/kernel/x8664_ksyms.c Fri Aug 23 14:19:06 2002 +++ b/arch/x86_64/kernel/x8664_ksyms.c Fri Aug 23 14:19:06 2002 @@ -109,7 +109,6 @@ #ifdef CONFIG_SMP EXPORT_SYMBOL(cpu_data); -EXPORT_SYMBOL(kernel_flag); EXPORT_SYMBOL(smp_num_cpus); EXPORT_SYMBOL(cpu_online_map); EXPORT_SYMBOL_NOVERS(__write_lock_failed); diff -Nru a/include/linux/smp_lock.h b/include/linux/smp_lock.h --- a/include/linux/smp_lock.h Fri Aug 23 14:19:06 2002 +++ b/include/linux/smp_lock.h Fri Aug 23 14:19:06 2002 @@ -2,21 +2,10 @@ #define __LINUX_SMPLOCK_H #include <linux/config.h> - -#if !defined(CONFIG_SMP) && !defined(CONFIG_PREEMPT) - -#define lock_kernel() do { } while(0) -#define unlock_kernel() do { } while(0) -#define release_kernel_lock(task) do { } while(0) -#define reacquire_kernel_lock(task) do { } while(0) -#define kernel_locked() 1 - -#else - -#include <linux/interrupt.h> -#include <linux/spinlock.h> #include <linux/sched.h> -#include <asm/current.h> +#include <linux/spinlock.h> + +#if CONFIG_SMP || CONFIG_PREEMPT extern spinlock_t kernel_flag; @@ -26,23 +15,22 @@ #define put_kernel_lock() spin_unlock(&kernel_flag) /* - * Release global kernel lock and global interrupt lock + * Release global kernel lock. */ -#define release_kernel_lock(task) \ -do { \ - if (unlikely(task->lock_depth >= 0)) \ - put_kernel_lock(); \ -} while (0) +static inline void release_kernel_lock(struct task_struct *task) +{ + if (unlikely(task->lock_depth >= 0)) + put_kernel_lock(); +} /* * Re-acquire the kernel lock */ -#define reacquire_kernel_lock(task) \ -do { \ - if (unlikely(task->lock_depth >= 0)) \ - get_kernel_lock(); \ -} while (0) - +static inline void reacquire_kernel_lock(struct task_struct *task) +{ + if (unlikely(task->lock_depth >= 0)) + get_kernel_lock(); +} /* * Getting the big kernel lock. @@ -51,22 +39,29 @@ * so we only need to worry about other * CPU's. */ -static __inline__ void lock_kernel(void) +static inline void lock_kernel(void) { int depth = current->lock_depth+1; - if (!depth) + if (likely(!depth)) get_kernel_lock(); current->lock_depth = depth; } -static __inline__ void unlock_kernel(void) +static inline void unlock_kernel(void) { - if (current->lock_depth < 0) + if (unlikely(current->lock_depth < 0)) BUG(); - if (--current->lock_depth < 0) + if (likely(--current->lock_depth < 0)) put_kernel_lock(); } -#endif /* CONFIG_SMP */ +#else + +#define lock_kernel() do { } while(0) +#define unlock_kernel() do { } while(0) +#define release_kernel_lock(task) do { } while(0) +#define reacquire_kernel_lock(task) do { } while(0) +#define kernel_locked() 1 -#endif +#endif /* CONFIG_SMP || CONFIG_PREEMPT */ +#endif /* __LINUX_SMPLOCK_H */ diff -Nru a/kernel/ksyms.c b/kernel/ksyms.c --- a/kernel/ksyms.c Fri Aug 23 14:19:06 2002 +++ b/kernel/ksyms.c Fri Aug 23 14:19:06 2002 @@ -51,6 +51,7 @@ #include <linux/buffer_head.h> #include <linux/root_dev.h> #include <linux/percpu.h> +#include <linux/smp_lock.h> #include <asm/checksum.h> #if defined(CONFIG_PROC_FS) @@ -480,6 +481,9 @@ EXPORT_SYMBOL_GPL(idle_cpu); #if CONFIG_SMP EXPORT_SYMBOL_GPL(set_cpus_allowed); +#endif +#if CONFIG_SMP || CONFIG_PREEMPT +EXPORT_SYMBOL(kernel_flag); #endif EXPORT_SYMBOL(jiffies); EXPORT_SYMBOL(jiffies_64); diff -Nru a/kernel/sched.c b/kernel/sched.c --- a/kernel/sched.c Fri Aug 23 14:19:06 2002 +++ b/kernel/sched.c Fri Aug 23 14:19:06 2002 @@ -1881,7 +1881,6 @@ } #if CONFIG_SMP - /* * This is how migration works: * @@ -2068,6 +2067,20 @@ return 0; } +#endif + +#if CONFIG_SMP || CONFIG_PREEMPT +/* + * The 'big kernel lock' + * + * This spinlock is taken and released recursively by lock_kernel() + * and unlock_kernel(). It is transparently dropped and reaquired + * 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. + */ +spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED; #endif extern void init_timervecs(void); ===================================================================
This BitKeeper patch contains the following changesets: 1.509 ## Wrapped with gzip_uu ##
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