trace_syscalls: Simplify syscall profile

use only one prof_sysenter_enable() instead of
prof_sysenter_enable_##sname()

use only one prof_sysenter_disable() instead of
prof_sysenter_disable_##sname()

use only one prof_sysexit_enable() instead of
prof_sysexit_enable_##sname()

use only one prof_sysexit_disable() instead of
prof_sysexit_disable_##sname()

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B14D2A1.8060304@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 16 insertions, 47 deletions

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index cf0d923ea40e..c2df3a593236 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -99,37 +99,16 @@ struct perf_event_attr;
 #define __SC_TEST6(t6, a6, ...) __SC_TEST(t6); __SC_TEST5(__VA_ARGS__)
 
 #ifdef CONFIG_EVENT_PROFILE
-#define TRACE_SYS_ENTER_PROFILE(sname)                                         \
-static int prof_sysenter_enable_##sname(struct ftrace_event_call *unused)      \
-{                                                                              \
-        return reg_prof_syscall_enter("sys"#sname);                            \
-}                                                                              \
-                                                                               \
-static void prof_sysenter_disable_##sname(struct ftrace_event_call *unused)    \
-{                                                                              \
-        unreg_prof_syscall_enter("sys"#sname);                                 \
-}
-
-#define TRACE_SYS_EXIT_PROFILE(sname)                                          \
-static int prof_sysexit_enable_##sname(struct ftrace_event_call *unused)       \
-{                                                                              \
-        return reg_prof_syscall_exit("sys"#sname);                             \
-}                                                                              \
-                                                                               \
-static void prof_sysexit_disable_##sname(struct ftrace_event_call *unused)     \
-{                                                                              \
-        unreg_prof_syscall_exit("sys"#sname);                                  \
-}
 
 #define TRACE_SYS_ENTER_PROFILE_INIT(sname)                                    \
         .profile_count = ATOMIC_INIT(-1),                                      \
-        .profile_enable = prof_sysenter_enable_##sname,                        \
-        .profile_disable = prof_sysenter_disable_##sname,
+        .profile_enable = prof_sysenter_enable,                                \
+        .profile_disable = prof_sysenter_disable,
 
 #define TRACE_SYS_EXIT_PROFILE_INIT(sname)                                     \
         .profile_count = ATOMIC_INIT(-1),                                      \
-        .profile_enable = prof_sysexit_enable_##sname,                         \
-        .profile_disable = prof_sysexit_disable_##sname,
+        .profile_enable = prof_sysexit_enable,                                 \
+        .profile_disable = prof_sysexit_disable,
 #else
 #define TRACE_SYS_ENTER_PROFILE(sname)
 #define TRACE_SYS_ENTER_PROFILE_INIT(sname)
@@ -158,7 +137,6 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *unused)     \
         struct trace_event enter_syscall_print_##sname = {              \
                 .trace                  = print_syscall_enter,          \
         };                                                              \
-        TRACE_SYS_ENTER_PROFILE(sname);                                 \
         static struct ftrace_event_call __used                          \
           __attribute__((__aligned__(4)))                               \
           __attribute__((section("_ftrace_events")))                    \
@@ -181,7 +159,6 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *unused)     \
         struct trace_event exit_syscall_print_##sname = {               \
                 .trace                  = print_syscall_exit,           \
         };                                                              \
-        TRACE_SYS_EXIT_PROFILE(sname);                                  \
         static struct ftrace_event_call __used                          \
           __attribute__((__aligned__(4)))                               \
           __attribute__((section("_ftrace_events")))                    \
diff --git a/include/trace/syscall.h b/include/trace/syscall.h
index dff9371e5274..961fda3556bb 100644
--- a/include/trace/syscall.h
+++ b/include/trace/syscall.h
@@ -50,10 +50,10 @@ enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags);
 enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags);
 #endif
 #ifdef CONFIG_EVENT_PROFILE
-int reg_prof_syscall_enter(char *name);
-void unreg_prof_syscall_enter(char *name);
-int reg_prof_syscall_exit(char *name);
-void unreg_prof_syscall_exit(char *name);
+int prof_sysenter_enable(struct ftrace_event_call *call);
+void prof_sysenter_disable(struct ftrace_event_call *call);
+int prof_sysexit_enable(struct ftrace_event_call *call);
+void prof_sysexit_disable(struct ftrace_event_call *call);
 
 #endif
 
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index c6514093c95a..1e85b6cc26aa 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -520,14 +520,12 @@ end_recursion:
         local_irq_restore(flags);
 }
 
-int reg_prof_syscall_enter(char *name)
+int prof_sysenter_enable(struct ftrace_event_call *call)
 {
         int ret = 0;
         int num;
 
-        num = syscall_name_to_nr(name);
-        if (num < 0 || num >= NR_syscalls)
-                return -ENOSYS;
+        num = ((struct syscall_metadata *)call->data)->syscall_nr;
 
         mutex_lock(&syscall_trace_lock);
         if (!sys_prof_refcount_enter)
@@ -543,13 +541,11 @@ int reg_prof_syscall_enter(char *name)
         return ret;
 }
 
-void unreg_prof_syscall_enter(char *name)
+void prof_sysenter_disable(struct ftrace_event_call *call)
 {
         int num;
 
-        num = syscall_name_to_nr(name);
-        if (num < 0 || num >= NR_syscalls)
-                return;
+        num = ((struct syscall_metadata *)call->data)->syscall_nr;
 
         mutex_lock(&syscall_trace_lock);
         sys_prof_refcount_enter--;
@@ -625,14 +621,12 @@ end_recursion:
         local_irq_restore(flags);
 }
 
-int reg_prof_syscall_exit(char *name)
+int prof_sysexit_enable(struct ftrace_event_call *call)
 {
         int ret = 0;
         int num;
 
-        num = syscall_name_to_nr(name);
-        if (num < 0 || num >= NR_syscalls)
-                return -ENOSYS;
+        num = ((struct syscall_metadata *)call->data)->syscall_nr;
 
         mutex_lock(&syscall_trace_lock);
         if (!sys_prof_refcount_exit)
@@ -648,13 +642,11 @@ int reg_prof_syscall_exit(char *name)
         return ret;
 }
 
-void unreg_prof_syscall_exit(char *name)
+void prof_sysexit_disable(struct ftrace_event_call *call)
 {
         int num;
 
-        num = syscall_name_to_nr(name);
-        if (num < 0 || num >= NR_syscalls)
-                return;
+        num = ((struct syscall_metadata *)call->data)->syscall_nr;
 
         mutex_lock(&syscall_trace_lock);
         sys_prof_refcount_exit--;