From 2736bde07ddcd2eae2e72e3328a9b66652f4d604 Mon Sep 17 00:00:00 2001
From: kib <kib@FreeBSD.org>
Date: Thu, 28 Jul 2016 11:43:25 +0000
Subject: MFC r303151: Provide counter_warning(9) KPI.

MFC r303155:
Hide counted_warning(9) under #ifdef _KERNEL braces.

Approved by:	re (gjb)
---
 sys/kern/subr_prf.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'sys/kern/subr_prf.c')

diff --git a/sys/kern/subr_prf.c b/sys/kern/subr_prf.c
index 5bcf39b..3784ffd 100644
--- a/sys/kern/subr_prf.c
+++ b/sys/kern/subr_prf.c
@@ -1196,3 +1196,24 @@ sbuf_hexdump(struct sbuf *sb, const void *ptr, int length, const char *hdr,
 	}
 }
 
+#ifdef _KERNEL
+void
+counted_warning(unsigned *counter, const char *msg)
+{
+	struct thread *td;
+	unsigned c;
+
+	for (;;) {
+		c = *counter;
+		if (c == 0)
+			break;
+		if (atomic_cmpset_int(counter, c, c - 1)) {
+			td = curthread;
+			log(LOG_INFO, "pid %d (%s) %s%s\n",
+			    td->td_proc->p_pid, td->td_name, msg,
+			    c > 1 ? "" : " - not logging anymore");
+			break;
+		}
+	}
+}
+#endif
-- 
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