Re: [PATCH 01/20] x86: move prepare_ftrace_return prototype to header

From: Arnd Bergmann <arnd@arndb.de>

On 32-bit builds, the prepare_ftrace_return() function only has a global
definition, but no prototype before it, which causes a warning:

arch/x86/kernel/ftrace.c:625:6: warning: no previous prototype for ‘prepare_ftrace_return’ [-Wmissing-prototypes]
  625 | void prepare_ftrace_return(unsigned long ip, unsigned long *parent,

Move the prototype that is already needed for some configurations into
a header file where it can be seen unconditionally.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/x86/include/asm/ftrace.h | 3 +++
 arch/x86/kernel/ftrace.c      | 3 ---
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index 5061ac98ffa1..b8d4a07f9595 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h