[PATCH] trace_syscalls: cleanup for syscalls_metadata

[Lai Jiangshan <laijs@cn.fujitsu.com>]

NR_syscalls is compile-time constant.
so we allocates memory for syscalls_metadata at compile-time.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index f694f66..c7db995 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -17,7 +17,7 @@ static DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
 extern unsigned long __start_syscalls_metadata[];
 extern unsigned long __stop_syscalls_metadata[];
 
-static struct syscall_metadata **syscalls_metadata;
+static struct syscall_metadata *syscalls_metadata[NR_syscalls];
 
 static struct syscall_metadata *find_syscall_meta(unsigned long syscall)
 {
@@ -45,7 +45,7 @@ static struct syscall_metadata *find_syscall_meta(unsigned long syscall)
 
 static struct syscall_metadata *syscall_nr_to_meta(int nr)
 {
-	if (!syscalls_metadata || nr >= NR_syscalls || nr < 0)
+	if (nr >= NR_syscalls || nr < 0)
 		return NULL;
 
 	return syscalls_metadata[nr];
@@ -400,13 +400,6 @@ int __init init_ftrace_syscalls(void)
 	unsigned long addr;
 	int i;
 
-	syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) *
-					NR_syscalls, GFP_KERNEL);
-	if (!syscalls_metadata) {
-		WARN_ON(1);
-		return -ENOMEM;
-	}
-
 	for (i = 0; i < NR_syscalls; i++) {
 		addr = arch_syscall_addr(i);
 		meta = find_syscall_meta(addr);