perf: Fix kABI breakage in struct perf_event

jira VULN-6760
cve CVE-2023-5717
commit-author Shreeya Patel <spatel@ciq.com>

Fix kabi breakage in commit 32671e3 ("[Backport] perf: Disallow
mis-matched inherited group reads")

Fixes: 32671e3 ("perf: Disallow mis-matched inherited group reads")
Signed-off-by: Shreeya Patel <spatel@ciq.com>

Author: shreeya-patel98

include/linux/perf_event.h

@@ -61,6 +61,7 @@ struct perf_guest_info_callbacks {
 #include <linux/security.h>
 #include <linux/static_call.h>
 #include <linux/lockdep.h>
+#include <linux/rh_kabi.h>
 #include <asm/local.h>
 
 struct perf_callchain_entry {
@@ -691,7 +692,6 @@ struct perf_event {
 	/* The cumulative AND of all event_caps for events in this group. */
 	int				group_caps;
 
-	unsigned int			group_generation;
 	struct perf_event		*group_leader;
 	struct pmu			*pmu;
 	void				*pmu_private;
@@ -804,6 +804,8 @@ struct perf_event {
 	void *security;
 #endif
 	struct list_head		sb_list;
+
+	RH_KABI_EXTEND(unsigned int	group_generation)
 #endif /* CONFIG_PERF_EVENTS */
 };