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-rw-r--r--include/linux/perf_event.h7
-rw-r--r--kernel/events/core.c7
2 files changed, 7 insertions, 7 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index ca9ed4e..ddbb6a9 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -403,13 +403,6 @@ struct perf_event_mmap_page {
__u64 data_tail; /* user-space written tail */
};
-/*
- * Build time assertion that we keep the data_head at the intended location.
- * IOW, validation we got the __reserved[] size right.
- */
-extern char __assert_mmap_data_head_offset
- [1 - 2*!!(offsetof(struct perf_event_mmap_page, data_head) != 1024)];
-
#define PERF_RECORD_MISC_CPUMODE_MASK (7 << 0)
#define PERF_RECORD_MISC_CPUMODE_UNKNOWN (0 << 0)
#define PERF_RECORD_MISC_KERNEL (1 << 0)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index dc3b052..3f92a19 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7116,6 +7116,13 @@ void __init perf_event_init(void)
/* do not patch jump label more than once per second */
jump_label_rate_limit(&perf_sched_events, HZ);
+
+ /*
+ * Build time assertion that we keep the data_head at the intended
+ * location. IOW, validation we got the __reserved[] size right.
+ */
+ BUILD_BUG_ON((offsetof(struct perf_event_mmap_page, data_head))
+ != 1024);
}
static int __init perf_event_sysfs_init(void)
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