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ftrace/samples: Add missing prototype for my_direct_func

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There's compilation fail reported kernel test robot for W=1 build:

  >> samples/ftrace/ftrace-direct-multi.c:8:6: warning: no previous
  prototype for function 'my_direct_func' [-Wmissing-prototypes]
     void my_direct_func(unsigned long ip)

The inlined assembly is used outside function, so we can't make
my_direct_func static and pass it as asm input argument.

However my_tramp is already extern so I think there's no problem
keeping my_direct_func extern as well and just add its prototype.

Link: https://lkml.kernel.org/r/20211101153907.377668-1-jolsa@kernel.org

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 5fae941b9a ("ftrace/samples: Add multi direct interface test module")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Jiri Olsa 2021-11-01 16:39:07 +01:00 committed by Steven Rostedt (VMware)
parent 4e9f63c9e5
commit 67d4f6e3bf
1 changed files with 2 additions and 0 deletions
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samples/ftrace/ftrace-direct-multi.c
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@ -5,6 +5,8 @@
#include <linux/ftrace.h>
#include <linux/sched/stat.h>
extern void my_direct_func(unsigned long ip);
void my_direct_func(unsigned long ip)
{
trace_printk("ip %lx\n", ip);