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tracing: Call arch_init_ftrace_syscalls at boot

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Call arch_init_ftrace_syscalls at boot, so we can determine early the
set of syscalls for the syscall trace events.

Signed-off-by: Jason Baron <jbaron@redhat.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Jason Baron 2009-08-10 16:52:23 -04:00 committed by Frederic Weisbecker
parent eeac19a7ef
commit 066e0378c2
3 changed files with 4 additions and 13 deletions
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15
arch/x86/kernel/ftrace.c
View file

@ -516,31 +516,24 @@ int syscall_name_to_nr(char *name)
return -1; return -1;
} }
void arch_init_ftrace_syscalls(void) static int __init arch_init_ftrace_syscalls(void)
{ {
int i; int i;
struct syscall_metadata *meta; struct syscall_metadata *meta;
unsigned long **psys_syscall_table = &sys_call_table; unsigned long **psys_syscall_table = &sys_call_table;
static atomic_t refs;
if (atomic_inc_return(&refs) != 1)
goto end;
syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) * syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) *
FTRACE_SYSCALL_MAX, GFP_KERNEL); FTRACE_SYSCALL_MAX, GFP_KERNEL);
if (!syscalls_metadata) { if (!syscalls_metadata) {
WARN_ON(1); WARN_ON(1);
return; return -ENOMEM;
} }
for (i = 0; i < FTRACE_SYSCALL_MAX; i++) { for (i = 0; i < FTRACE_SYSCALL_MAX; i++) {
meta = find_syscall_meta(psys_syscall_table[i]); meta = find_syscall_meta(psys_syscall_table[i]);
syscalls_metadata[i] = meta; syscalls_metadata[i] = meta;
} }
return; return 0;
/* Paranoid: avoid overflow */
end:
atomic_dec(&refs);
} }
arch_initcall(arch_init_ftrace_syscalls);
#endif #endif

1
include/trace/syscall.h
View file

@ -19,7 +19,6 @@ struct syscall_metadata {
}; };
#ifdef CONFIG_FTRACE_SYSCALLS #ifdef CONFIG_FTRACE_SYSCALLS
extern void arch_init_ftrace_syscalls(void);
extern struct syscall_metadata *syscall_nr_to_meta(int nr); extern struct syscall_metadata *syscall_nr_to_meta(int nr);
extern void start_ftrace_syscalls(void); extern void start_ftrace_syscalls(void);
extern void stop_ftrace_syscalls(void); extern void stop_ftrace_syscalls(void);

1
kernel/trace/trace_syscalls.c
View file

@ -106,7 +106,6 @@ void start_ftrace_syscalls(void)
if (++refcount != 1) if (++refcount != 1)
goto unlock; goto unlock;
arch_init_ftrace_syscalls();
read_lock_irqsave(&tasklist_lock, flags); read_lock_irqsave(&tasklist_lock, flags);
do_each_thread(g, t) { do_each_thread(g, t) {