diff options
Diffstat (limited to 'kernel')
39 files changed, 566 insertions, 492 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index aed1ba569954..3207a4d26849 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -299,8 +299,8 @@ static int verify_opcode(struct page *page, unsigned long vaddr, uprobe_opcode_t * Called with mm->mmap_sem held for write. * Return 0 (success) or a negative errno. */ -int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr, - uprobe_opcode_t opcode) +int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, + unsigned long vaddr, uprobe_opcode_t opcode) { struct page *old_page, *new_page; struct vm_area_struct *vma; @@ -351,7 +351,7 @@ put_old: */ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr) { - return uprobe_write_opcode(mm, vaddr, UPROBE_SWBP_INSN); + return uprobe_write_opcode(auprobe, mm, vaddr, UPROBE_SWBP_INSN); } /** @@ -366,7 +366,8 @@ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned int __weak set_orig_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr) { - return uprobe_write_opcode(mm, vaddr, *(uprobe_opcode_t *)&auprobe->insn); + return uprobe_write_opcode(auprobe, mm, vaddr, + *(uprobe_opcode_t *)&auprobe->insn); } static struct uprobe *get_uprobe(struct uprobe *uprobe) @@ -840,13 +841,8 @@ register_for_each_vma(struct uprobe *uprobe, struct uprobe_consumer *new) return err; } -static int __uprobe_register(struct uprobe *uprobe, struct uprobe_consumer *uc) -{ - consumer_add(uprobe, uc); - return register_for_each_vma(uprobe, uc); -} - -static void __uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc) +static void +__uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc) { int err; @@ -860,24 +856,46 @@ static void __uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *u } /* - * uprobe_register - register a probe + * uprobe_unregister - unregister an already registered probe. + * @inode: the file in which the probe has to be removed. + * @offset: offset from the start of the file. + * @uc: identify which probe if multiple probes are colocated. + */ +void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) +{ + struct uprobe *uprobe; + + uprobe = find_uprobe(inode, offset); + if (WARN_ON(!uprobe)) + return; + + down_write(&uprobe->register_rwsem); + __uprobe_unregister(uprobe, uc); + up_write(&uprobe->register_rwsem); + put_uprobe(uprobe); +} +EXPORT_SYMBOL_GPL(uprobe_unregister); + +/* + * __uprobe_register - register a probe * @inode: the file in which the probe has to be placed. * @offset: offset from the start of the file. * @uc: information on howto handle the probe.. * - * Apart from the access refcount, uprobe_register() takes a creation + * Apart from the access refcount, __uprobe_register() takes a creation * refcount (thro alloc_uprobe) if and only if this @uprobe is getting * inserted into the rbtree (i.e first consumer for a @inode:@offset * tuple). Creation refcount stops uprobe_unregister from freeing the * @uprobe even before the register operation is complete. Creation * refcount is released when the last @uc for the @uprobe - * unregisters. Caller of uprobe_register() is required to keep @inode + * unregisters. Caller of __uprobe_register() is required to keep @inode * (and the containing mount) referenced. * * Return errno if it cannot successully install probes * else return 0 (success) */ -int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) +static int __uprobe_register(struct inode *inode, loff_t offset, + struct uprobe_consumer *uc) { struct uprobe *uprobe; int ret; @@ -904,7 +922,8 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer * down_write(&uprobe->register_rwsem); ret = -EAGAIN; if (likely(uprobe_is_active(uprobe))) { - ret = __uprobe_register(uprobe, uc); + consumer_add(uprobe, uc); + ret = register_for_each_vma(uprobe, uc); if (ret) __uprobe_unregister(uprobe, uc); } @@ -915,6 +934,12 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer * goto retry; return ret; } + +int uprobe_register(struct inode *inode, loff_t offset, + struct uprobe_consumer *uc) +{ + return __uprobe_register(inode, offset, uc); +} EXPORT_SYMBOL_GPL(uprobe_register); /* @@ -946,27 +971,6 @@ int uprobe_apply(struct inode *inode, loff_t offset, return ret; } -/* - * uprobe_unregister - unregister an already registered probe. - * @inode: the file in which the probe has to be removed. - * @offset: offset from the start of the file. - * @uc: identify which probe if multiple probes are colocated. - */ -void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) -{ - struct uprobe *uprobe; - - uprobe = find_uprobe(inode, offset); - if (WARN_ON(!uprobe)) - return; - - down_write(&uprobe->register_rwsem); - __uprobe_unregister(uprobe, uc); - up_write(&uprobe->register_rwsem); - put_uprobe(uprobe); -} -EXPORT_SYMBOL_GPL(uprobe_unregister); - static int unapply_uprobe(struct uprobe *uprobe, struct mm_struct *mm) { struct vm_area_struct *vma; diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 5fa4d3138bf1..e406c5fdb41e 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -55,6 +55,7 @@ #include "lockdep_internals.h" +#include <trace/events/preemptirq.h> #define CREATE_TRACE_POINTS #include <trace/events/lock.h> @@ -248,12 +249,7 @@ void clear_lock_stats(struct lock_class *class) static struct lock_class_stats *get_lock_stats(struct lock_class *class) { - return &get_cpu_var(cpu_lock_stats)[class - lock_classes]; -} - -static void put_lock_stats(struct lock_class_stats *stats) -{ - put_cpu_var(cpu_lock_stats); + return &this_cpu_ptr(cpu_lock_stats)[class - lock_classes]; } static void lock_release_holdtime(struct held_lock *hlock) @@ -271,7 +267,6 @@ static void lock_release_holdtime(struct held_lock *hlock) lock_time_inc(&stats->read_holdtime, holdtime); else lock_time_inc(&stats->write_holdtime, holdtime); - put_lock_stats(stats); } #else static inline void lock_release_holdtime(struct held_lock *hlock) @@ -2845,10 +2840,8 @@ static void __trace_hardirqs_on_caller(unsigned long ip) debug_atomic_inc(hardirqs_on_events); } -__visible void trace_hardirqs_on_caller(unsigned long ip) +void lockdep_hardirqs_on(unsigned long ip) { - time_hardirqs_on(CALLER_ADDR0, ip); - if (unlikely(!debug_locks || current->lockdep_recursion)) return; @@ -2887,23 +2880,14 @@ __visible void trace_hardirqs_on_caller(unsigned long ip) __trace_hardirqs_on_caller(ip); current->lockdep_recursion = 0; } -EXPORT_SYMBOL(trace_hardirqs_on_caller); - -void trace_hardirqs_on(void) -{ - trace_hardirqs_on_caller(CALLER_ADDR0); -} -EXPORT_SYMBOL(trace_hardirqs_on); /* * Hardirqs were disabled: */ -__visible void trace_hardirqs_off_caller(unsigned long ip) +void lockdep_hardirqs_off(unsigned long ip) { struct task_struct *curr = current; - time_hardirqs_off(CALLER_ADDR0, ip); - if (unlikely(!debug_locks || current->lockdep_recursion)) return; @@ -2925,13 +2909,6 @@ __visible void trace_hardirqs_off_caller(unsigned long ip) } else debug_atomic_inc(redundant_hardirqs_off); } -EXPORT_SYMBOL(trace_hardirqs_off_caller); - -void trace_hardirqs_off(void) -{ - trace_hardirqs_off_caller(CALLER_ADDR0); -} -EXPORT_SYMBOL(trace_hardirqs_off); /* * Softirqs will be enabled: @@ -4090,7 +4067,6 @@ __lock_contended(struct lockdep_map *lock, unsigned long ip) stats->contending_point[contending_point]++; if (lock->cpu != smp_processor_id()) stats->bounces[bounce_contended + !!hlock->read]++; - put_lock_stats(stats); } static void @@ -4138,7 +4114,6 @@ __lock_acquired(struct lockdep_map *lock, unsigned long ip) } if (lock->cpu != cpu) stats->bounces[bounce_acquired + !!hlock->read]++; - put_lock_stats(stats); lock->cpu = cpu; lock->ip = ip; @@ -4338,7 +4313,7 @@ out_restore: raw_local_irq_restore(flags); } -void __init lockdep_info(void) +void __init lockdep_init(void) { printk("Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar\n"); diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 454adf9f8180..c89302ddf807 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3159,7 +3159,7 @@ static inline void sched_tick_stop(int cpu) { } #endif #if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \ - defined(CONFIG_PREEMPT_TRACER)) + defined(CONFIG_TRACE_PREEMPT_TOGGLE)) /* * If the value passed in is equal to the current preempt count * then we just disabled preemption. Start timing the latency. diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 9a27f146fa1c..c042a455afc6 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -47,6 +47,11 @@ config HAVE_FENTRY help Arch supports the gcc options -pg with -mfentry +config HAVE_NOP_MCOUNT + bool + help + Arch supports the gcc options -pg with -mrecord-mcount and -nop-mcount + config HAVE_C_RECORDMCOUNT bool help @@ -82,6 +87,15 @@ config RING_BUFFER_ALLOW_SWAP Allow the use of ring_buffer_swap_cpu. Adds a very slight overhead to tracing when enabled. +config PREEMPTIRQ_TRACEPOINTS + bool + depends on TRACE_PREEMPT_TOGGLE || TRACE_IRQFLAGS + select TRACING + default y + help + Create preempt/irq toggle tracepoints if needed, so that other parts + of the kernel can use them to generate or add hooks to them. + # All tracer options should select GENERIC_TRACER. For those options that are # enabled by all tracers (context switch and event tracer) they select TRACING. # This allows those options to appear when no other tracer is selected. But the @@ -155,18 +169,20 @@ config FUNCTION_GRAPH_TRACER the return value. This is done by setting the current return address on the current task structure into a stack of calls. +config TRACE_PREEMPT_TOGGLE + bool + help + Enables hooks which will be called when preemption is first disabled, + and last enabled. config PREEMPTIRQ_EVENTS bool "Enable trace events for preempt and irq disable/enable" select TRACE_IRQFLAGS - depends on DEBUG_PREEMPT || !PROVE_LOCKING - depends on TRACING + select TRACE_PREEMPT_TOGGLE if PREEMPT + select GENERIC_TRACER default n help Enable tracing of disable and enable events for preemption and irqs. - For tracing preempt disable/enable events, DEBUG_PREEMPT must be - enabled. For tracing irq disable/enable events, PROVE_LOCKING must - be disabled. config IRQSOFF_TRACER bool "Interrupts-off Latency Tracer" @@ -203,6 +219,7 @@ config PREEMPT_TRACER select RING_BUFFER_ALLOW_SWAP select TRACER_SNAPSHOT select TRACER_SNAPSHOT_PER_CPU_SWAP + select TRACE_PREEMPT_TOGGLE help This option measures the time spent in preemption-off critical sections, with microsecond accuracy. @@ -456,6 +473,26 @@ config KPROBE_EVENTS This option is also required by perf-probe subcommand of perf tools. If you want to use perf tools, this option is strongly recommended. +config KPROBE_EVENTS_ON_NOTRACE + bool "Do NOT protect notrace function from kprobe events" + depends on KPROBE_EVENTS + depends on KPROBES_ON_FTRACE + default n + help + This is only for the developers who want to debug ftrace itself + using kprobe events. + + If kprobes can use ftrace instead of breakpoint, ftrace related + functions are protected from kprobe-events to prevent an infinit + recursion or any unexpected execution path which leads to a kernel + crash. + + This option disables such protection and allows you to put kprobe + events on ftrace functions for debugging ftrace by itself. + Note that this might let you shoot yourself in the foot. + + If unsure, say N. + config UPROBE_EVENTS bool "Enable uprobes-based dynamic events" depends on ARCH_SUPPORTS_UPROBES @@ -687,6 +724,21 @@ config RING_BUFFER_STARTUP_TEST If unsure, say N +config PREEMPTIRQ_DELAY_TEST + tristate "Preempt / IRQ disable delay thread to test latency tracers" + depends on m + help + Select this option to build a test module that can help test latency + tracers by executing a preempt or irq disable section with a user + configurable delay. The module busy waits for the duration of the + critical section. + + For example, the following invocation forces a one-time irq-disabled + critical section for 500us: + modprobe preemptirq_delay_test test_mode=irq delay=500000 + + If unsure, say N + config TRACE_EVAL_MAP_FILE bool "Show eval mappings for trace events" depends on TRACING diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index e2538c7638d4..98d53b39a8ee 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -13,6 +13,11 @@ obj-y += trace_selftest_dynamic.o endif endif +ifdef CONFIG_FTRACE_STARTUP_TEST +CFLAGS_trace_kprobe_selftest.o = $(CC_FLAGS_FTRACE) +obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe_selftest.o +endif + # If unlikely tracing is enabled, do not trace these files ifdef CONFIG_TRACING_BRANCHES KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING @@ -33,9 +38,10 @@ obj-$(CONFIG_TRACING) += trace_seq.o obj-$(CONFIG_TRACING) += trace_stat.o obj-$(CONFIG_TRACING) += trace_printk.o obj-$(CONFIG_TRACING_MAP) += tracing_map.o +obj-$(CONFIG_PREEMPTIRQ_DELAY_TEST) += preemptirq_delay_test.o obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o -obj-$(CONFIG_PREEMPTIRQ_EVENTS) += trace_irqsoff.o +obj-$(CONFIG_PREEMPTIRQ_TRACEPOINTS) += trace_preemptirq.o obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index b951aa1fac61..2a24a59e99c5 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1,19 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk> * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - * */ #include <linux/kernel.h> #include <linux/blkdev.h> diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 0ae6829804bc..08fcfe440c63 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1,9 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2011-2015 PLUMgrid, http://plumgrid.com * Copyright (c) 2016 Facebook - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of version 2 of the GNU General Public - * License as published by the Free Software Foundation. */ #include <linux/kernel.h> #include <linux/types.h> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index caf9cbf35816..f536f601bd46 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Infrastructure for profiling code inserted by 'gcc -pg'. * @@ -157,30 +158,6 @@ static inline void ftrace_ops_init(struct ftrace_ops *ops) #endif } -/** - * ftrace_nr_registered_ops - return number of ops registered - * - * Returns the number of ftrace_ops registered and tracing functions - */ -int ftrace_nr_registered_ops(void) -{ - struct ftrace_ops *ops; - int cnt = 0; - - mutex_lock(&ftrace_lock); - - for (ops = rcu_dereference_protected(ftrace_ops_list, - lockdep_is_held(&ftrace_lock)); - ops != &ftrace_list_end; - ops = rcu_dereference_protected(ops->next, - lockdep_is_held(&ftrace_lock))) - cnt++; - - mutex_unlock(&ftrace_lock); - - return cnt; -} - static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct pt_regs *regs) { @@ -313,11 +290,6 @@ static void update_ftrace_function(void) ftrace_trace_function = func; } -int using_ftrace_ops_list_func(void) -{ - return ftrace_trace_function == ftrace_ops_list_func; -} - static void add_ftrace_ops(struct ftrace_ops __rcu **list, struct ftrace_ops *ops) { @@ -1049,8 +1021,6 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer) } #endif /* CONFIG_FUNCTION_PROFILER */ -static struct pid * const ftrace_swapper_pid = &init_struct_pid; - #ifdef CONFIG_FUNCTION_GRAPH_TRACER static int ftrace_graph_active; #else @@ -2927,22 +2897,22 @@ ops_references_rec(struct ftrace_ops *ops, struct dyn_ftrace *rec) { /* If ops isn't enabled, ignore it */ if (!(ops->flags & FTRACE_OPS_FL_ENABLED)) - return 0; + return false; /* If ops traces all then it includes this function */ if (ops_traces_mod(ops)) - return 1; + return true; /* The function must be in the filter */ if (!ftrace_hash_empty(ops->func_hash->filter_hash) && !__ftrace_lookup_ip(ops->func_hash->filter_hash, rec->ip)) - return 0; + return false; /* If in notrace hash, we ignore it too */ if (ftrace_lookup_ip(ops->func_hash->notrace_hash, rec->ip)) - return 0; + return false; - return 1; + return true; } static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs) @@ -2981,12 +2951,14 @@ static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs) p = &pg->records[i]; p->flags = rec_flags; +#ifndef CC_USING_NOP_MCOUNT /* * Do the initial record conversion from mcount jump * to the NOP instructions. */ if (!ftrace_code_disable(mod, p)) break; +#endif update_cnt++; } diff --git a/kernel/trace/preemptirq_delay_test.c b/kernel/trace/preemptirq_delay_test.c new file mode 100644 index 000000000000..f704390db9fc --- /dev/null +++ b/kernel/trace/preemptirq_delay_test.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Preempt / IRQ disable delay thread to test latency tracers + * + * Copyright (C) 2018 Joel Fernandes (Google) <joel@joelfernandes.org> + */ + +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/ktime.h> +#include <linux/module.h> +#include <linux/printk.h> +#include <linux/string.h> + +static ulong delay = 100; +static char test_mode[10] = "irq"; + +module_param_named(delay, delay, ulong, S_IRUGO); +module_param_string(test_mode, test_mode, 10, S_IRUGO); +MODULE_PARM_DESC(delay, "Period in microseconds (100 uS default)"); +MODULE_PARM_DESC(test_mode, "Mode of the test such as preempt or irq (default irq)"); + +static void busy_wait(ulong time) +{ + ktime_t start, end; + start = ktime_get(); + do { + end = ktime_get(); + if (kthread_should_stop()) + break; + } while (ktime_to_ns(ktime_sub(end, start)) < (time * 1000)); +} + +static int preemptirq_delay_run(void *data) +{ + unsigned long flags; + + if (!strcmp(test_mode, "irq")) { + local_irq_save(flags); + busy_wait(delay); + local_irq_restore(flags); + } else if (!strcmp(test_mode, "preempt")) { + preempt_disable(); + busy_wait(delay); + preempt_enable(); + } + + return 0; +} + +static int __init preemptirq_delay_init(void) +{ + char task_name[50]; + struct task_struct *test_task; + + snprintf(task_name, sizeof(task_name), "%s_test", test_mode); + + test_task = kthread_run(preemptirq_delay_run, NULL, task_name); + return PTR_ERR_OR_ZERO(test_task); +} + +static void __exit preemptirq_delay_exit(void) +{ + return; +} + +module_init(preemptirq_delay_init) +module_exit(preemptirq_delay_exit) +MODULE_LICENSE("GPL v2"); diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 0b0b688ea166..1d92d4a982fd 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Generic ring buffer * @@ -3221,7 +3222,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_record_on); * * Returns true if the ring buffer is in a state that it accepts writes. */ -int ring_buffer_record_is_on(struct ring_buffer *buffer) +bool ring_buffer_record_is_on(struct ring_buffer *buffer) { return !atomic_read(&buffer->record_disabled); } @@ -3237,7 +3238,7 @@ int ring_buffer_record_is_on(struct ring_buffer *buffer) * ring_buffer_record_disable(), as that is a temporary disabling of * the ring buffer. */ -int ring_buffer_record_is_set_on(struct ring_buffer *buffer) +bool ring_buffer_record_is_set_on(struct ring_buffer *buffer) { return !(atomic_read(&buffer->record_disabled) & RB_BUFFER_OFF); } diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c index 68ee79afe31c..ffba6789c0e2 100644 --- a/kernel/trace/ring_buffer_benchmark.c +++ b/kernel/trace/ring_buffer_benchmark.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * ring buffer tester and benchmark * diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 176debd3481b..bf6f1d70484d 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * ring buffer based function tracer * @@ -1087,7 +1088,7 @@ void disable_trace_on_warning(void) * * Shows real state of the ring buffer if it is enabled or not. */ -int tracer_tracing_is_on(struct trace_array *tr) +bool tracer_tracing_is_on(struct trace_array *tr) { if (tr->trace_buffer.buffer) return ring_buffer_record_is_on(tr->trace_buffer.buffer); @@ -7628,7 +7629,9 @@ rb_simple_write(struct file *filp, const char __user *ubuf, if (buffer) { mutex_lock(&trace_types_lock); - if (val) { + if (!!val == tracer_tracing_is_on(tr)) { + val = 0; /* do nothing */ + } else if (val) { tracer_tracing_on(tr); if (tr->current_trace->start) tr->current_trace->start(tr); diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index f8f86231ad90..3b8c0e24ab30 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -1,4 +1,4 @@ -/* SPDX-License-Identifier: GPL-2.0 */ +// SPDX-License-Identifier: GPL-2.0 #ifndef _LINUX_KERNEL_TRACE_H #define _LINUX_KERNEL_TRACE_H @@ -594,7 +594,7 @@ void tracing_reset_current(int cpu); void tracing_reset_all_online_cpus(void); int tracing_open_generic(struct inode *inode, struct file *filp); bool tracing_is_disabled(void); -int tracer_tracing_is_on(struct trace_array *tr); +bool tracer_tracing_is_on(struct trace_array *tr); void tracer_tracing_on(struct trace_array *tr); void tracer_tracing_off(struct trace_array *tr); struct dentry *trace_create_file(const char *name, @@ -937,7 +937,6 @@ void ftrace_destroy_function_files(struct trace_array *tr); void ftrace_init_global_array_ops(struct trace_array *tr); void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); void ftrace_reset_array_ops(struct trace_array *tr); -int using_ftrace_ops_list_func(void); void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d_tracer); @@ -1533,9 +1532,6 @@ extern int event_trigger_init(struct event_trigger_ops *ops, extern int trace_event_trigger_enable_disable(struct trace_event_file *file, int trigger_enable); extern void update_cond_flag(struct trace_event_file *file); -extern void unregister_trigger(char *glob, struct event_trigger_ops *ops, - struct event_trigger_data *test, - struct trace_event_file *file); extern int set_trigger_filter(char *filter_str, struct event_trigger_data *trigger_data, struct trace_event_file *file); @@ -1831,6 +1827,21 @@ static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) } #endif +#ifdef CONFIG_PREEMPT_TRACER +void tracer_preempt_on(unsigned long a0, unsigned long a1); +void tracer_preempt_off(unsigned long a0, unsigned long a1); +#else +static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } +static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } +#endif +#ifdef CONFIG_IRQSOFF_TRACER +void tracer_hardirqs_on(unsigned long a0, unsigned long a1); +void tracer_hardirqs_off(unsigned long a0, unsigned long a1); +#else +static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } +static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } +#endif + extern struct trace_iterator *tracepoint_print_iter; #endif /* _LINUX_KERNEL_TRACE_H */ diff --git a/kernel/trace/trace_benchmark.h b/kernel/trace/trace_benchmark.h index be1d86ff753d..79e6fbe5b365 100644 --- a/kernel/trace/trace_benchmark.h +++ b/kernel/trace/trace_benchmark.h @@ -1,4 +1,4 @@ -/* SPDX-License-Identifier: GPL-2.0 */ +// SPDX-License-Identifier: GPL-2.0 #undef TRACE_SYSTEM #define TRACE_SYSTEM benchmark diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c index d8a188e0418a..aaf6793ededa 100644 --- a/kernel/trace/trace_clock.c +++ b/ |