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| author | Chengming Zhou <zhouchengming@bytedance.com> | 2022-05-06 11:27:37 +0800 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2022-06-01 18:14:17 +0100 |
| commit | ff979b2a9d9779382030023bfc4e3b1989c8c314 (patch) | |
| tree | a1df39f27fa128aa7630115ce9db7edab8b38387 | |
| parent | 0616ea3f1b93a99264d84f3d002ae117f6526b62 (diff) | |
| download | linux-ff979b2a9d9779382030023bfc4e3b1989c8c314.tar.bz2 | |
ftrace/fgraph: fix increased missing-prototypes warnings
After commit e999995c84c3 ("ftrace: cleanup ftrace_graph_caller enable
and disable") merged into the linux-next tree, the kernel test robot
(lkp@intel.com) has send out report that there are increased missing-prototypes
warnings caused by that commit.
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 \
O=build_dir ARCH=sh SHELL=/bin/bash kernel/trace/
warning: no previous prototype for 'ftrace_enable_ftrace_graph_caller' [-Wmissing-prototypes]
warning: no previous prototype for 'ftrace_disable_ftrace_graph_caller' [-Wmissing-prototypes]
warning: no previous prototype for 'ftrace_return_to_handler' [-Wmissing-prototypes]
warning: no previous prototype for 'ftrace_graph_sleep_time_control' [-Wmissing-prototypes]
BTW there are so many missing-prototypes warnings if build kernel with "W=1".
The increased warnings for 'ftrace_[enable,disable]_ftrace_graph_caller'
is caused by CONFIG_FUNCTION_GRAPH_TRACER && !CONFIG_DYNAMIC_FTRACE,
so the declarations in <linux/ftrace.h> can't be seen in fgraph.c.
And this warning can't reproduce on x86_64 since x86_64 select
HAVE_FUNCTION_GRAPH_TRACER only when DYNAMIC_FTRACE, so fgraph.c will
always see the declarations in <linux/ftrace.h>.
This patch fix the increased warnings by put the definitions in
CONFIG_DYNAMIC_FTRACE although there are no real problems exist.
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20220506032737.23375-1-zhouchengming@bytedance.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
| -rw-r--r-- | kernel/trace/fgraph.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c index 289311680c29..2cd374294be7 100644 --- a/kernel/trace/fgraph.c +++ b/kernel/trace/fgraph.c @@ -30,6 +30,7 @@ int ftrace_graph_active; /* Both enabled by default (can be cleared by function_graph tracer flags */ static bool fgraph_sleep_time = true; +#ifdef CONFIG_DYNAMIC_FTRACE /* * archs can override this function if they must do something * to enable hook for graph tracer. @@ -47,6 +48,7 @@ int __weak ftrace_disable_ftrace_graph_caller(void) { return 0; } +#endif /** * ftrace_graph_stop - set to permanently disable function graph tracing |