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0c3351a0a4
commit4af4206be2upstream. syscall_regfunc() and syscall_unregfunc() should set/clear TIF_SYSCALL_TRACEPOINT system-wide, but do_each_thread() can race with copy_process() and miss the new child which was not added to the process/thread lists yet. Change copy_process() to update the child's TIF_SYSCALL_TRACEPOINT under tasklist. Link: http://lkml.kernel.org/p/20140413185854.GB20668@redhat.com Fixes:a871bd33a6"tracing: Add syscall tracepoints" Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
#ifndef _TRACE_SYSCALL_H
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#define _TRACE_SYSCALL_H
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#include <linux/tracepoint.h>
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#include <linux/unistd.h>
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#include <linux/ftrace_event.h>
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#include <linux/thread_info.h>
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#include <asm/ptrace.h>
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/*
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* A syscall entry in the ftrace syscalls array.
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*
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* @name: name of the syscall
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* @syscall_nr: number of the syscall
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* @nb_args: number of parameters it takes
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* @types: list of types as strings
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* @args: list of args as strings (args[i] matches types[i])
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* @enter_event: associated syscall_enter trace event
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* @exit_event: associated syscall_exit trace event
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*/
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struct syscall_metadata {
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const char *name;
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int syscall_nr;
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int nb_args;
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const char **types;
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const char **args;
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struct list_head enter_fields;
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struct ftrace_event_call *enter_event;
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struct ftrace_event_call *exit_event;
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};
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#ifdef CONFIG_FTRACE_SYSCALLS
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extern unsigned long arch_syscall_addr(int nr);
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extern int init_syscall_trace(struct ftrace_event_call *call);
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extern int reg_event_syscall_enter(struct ftrace_event_call *call);
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extern void unreg_event_syscall_enter(struct ftrace_event_call *call);
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extern int reg_event_syscall_exit(struct ftrace_event_call *call);
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extern void unreg_event_syscall_exit(struct ftrace_event_call *call);
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extern int
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ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s);
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enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags,
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struct trace_event *event);
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enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags,
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struct trace_event *event);
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#endif
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#ifdef CONFIG_PERF_EVENTS
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int perf_sysenter_enable(struct ftrace_event_call *call);
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void perf_sysenter_disable(struct ftrace_event_call *call);
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int perf_sysexit_enable(struct ftrace_event_call *call);
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void perf_sysexit_disable(struct ftrace_event_call *call);
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#endif
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#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
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static inline void syscall_tracepoint_update(struct task_struct *p)
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{
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if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
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set_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
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else
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clear_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
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}
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#else
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static inline void syscall_tracepoint_update(struct task_struct *p)
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{
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}
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#endif
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#endif /* _TRACE_SYSCALL_H */
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