[PATCH 1/2] make arch_init_ftrace_syscalls multiply callable

[Frank Ch. Eigler]

Since both the utrace-based ftrace engine and the original
syscall-specific ftrace engine use the syscall pretty-printer, this
initialization function needs to be callable from each of them.

Signed-off-by: Frank Ch. Eigler <f...@elastic.org>
---
 arch/x86/kernel/ftrace.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 1d0d7f4..1d99d3d 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -498,6 +498,9 @@ void arch_init_ftrace_syscalls(void)
        if (atomic_inc_return(&refs) != 1)
                goto end;
 
+        if (syscalls_metadata)
+                return;
+
        syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) *
                                        FTRACE_SYSCALL_MAX, GFP_KERNEL);
        if (!syscalls_metadata) {
-- 
1.6.0.6