[tip: perf/core] perf/core: Fix !CONFIG_PERF_EVENTS build warnings and failures

[tip-bot2 for Ingo Molnar]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     ae79d5588a04aec9dc4b0c6df700d131447306e0
Gitweb:        https://git.kernel.org/tip/ae79d5588a04aec9dc4b0c6df700d131447306e0
Author:        Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate:    Sat, 19 Oct 2019 09:15:27 +02:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Sat, 19 Oct 2019 09:15:27 +02:00

perf/core: Fix !CONFIG_PERF_EVENTS build warnings and failures

sparc64 runs into this warning:

  include/linux/security.h:1913:52: warning: 'struct perf_event' declared inside parameter list will not be visible outside of this definition or declaration

which is escalated to a build error in some of the .c files due to -Werror.

Fix it via a forward declaration, like we do for perf_event_attr, the stub inlines
don't actually need to know the structure of this struct.

Fixes: da97e18458fb: ("perf_event: Add support for LSM and SELinux checks")
Cc: "Joel Fernandes (Google)" <joel@xxxxxxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 include/linux/security.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/security.h b/include/linux/security.h
index 4df79ff..0a86bfe 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1896,6 +1896,7 @@ static inline void security_bpf_prog_free(struct bpf_prog_aux *aux)
 
 #ifdef CONFIG_PERF_EVENTS
 struct perf_event_attr;
+struct perf_event;
 
 #ifdef CONFIG_SECURITY
 extern int security_perf_event_open(struct perf_event_attr *attr, int type);