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| author |   Jason Baron <jbaron@redhat.com> | 2009-08-10 16:52:23 -0400 |
|---|---|---|
| committer |   Frederic Weisbecker <fweisbec@gmail.com> | 2009-08-11 20:35:26 +0200 |
| commit | 066e0378c23f0a3db730893f6a041e4a3922a385 (patch) | |
| tree | be402805c83dfc6547d4eb1e8b4129dcec1d9831 | |
| parent | tracing: Map syscall name to number (diff) | |
| download | linux-dev-066e0378c23f0a3db730893f6a041e4a3922a385.tar.xz linux-dev-066e0378c23f0a3db730893f6a041e4a3922a385.zip | |
tracing: Call arch_init_ftrace_syscalls at boot
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>
| -rw-r--r-- | arch/x86/kernel/ftrace.c | 15 | ||||
| -rw-r--r-- | include/trace/syscall.h | 1 | ||||
| -rw-r--r-- | kernel/trace/trace_syscalls.c | 1 |
3 files changed, 4 insertions, 13 deletions
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index afb31d72618d..0d93d409b8d2 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -516,31 +516,24 @@ int syscall_name_to_nr(char *name) return -1; } -void arch_init_ftrace_syscalls(void) +static int __init arch_init_ftrace_syscalls(void) { int i; struct syscall_metadata *meta; 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) * FTRACE_SYSCALL_MAX, GFP_KERNEL); if (!syscalls_metadata) { WARN_ON(1); - return; + return -ENOMEM; } for (i = 0; i < FTRACE_SYSCALL_MAX; i++) { meta = find_syscall_meta(psys_syscall_table[i]); syscalls_metadata[i] = meta; } - return; - - /* Paranoid: avoid overflow */ -end: - atomic_dec(&refs); + return 0; } +arch_initcall(arch_init_ftrace_syscalls); #endif diff --git a/include/trace/syscall.h b/include/trace/syscall.h index 8cfe515cbc47..c55fcce4fbb2 100644 --- a/include/trace/syscall.h +++ b/include/trace/syscall.h @@ -19,7 +19,6 @@ struct syscall_metadata { }; #ifdef CONFIG_FTRACE_SYSCALLS -extern void arch_init_ftrace_syscalls(void); extern struct syscall_metadata *syscall_nr_to_meta(int nr); extern void start_ftrace_syscalls(void); extern void stop_ftrace_syscalls(void); diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 5e579645ac86..08aed439feaf 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -106,7 +106,6 @@ void start_ftrace_syscalls(void) if (++refcount != 1) goto unlock; - arch_init_ftrace_syscalls(); read_lock_irqsave(&tasklist_lock, flags); do_each_thread(g, t) { |