[Skiboot] [PATCH] Limit number of "Poller recursion detected" errors to display

[Stewart Smith]

In some error conditions, we could spiral out of control on this
and spend all of our time printing the exact same backtrace.

Limit it to 16 times, because 16 is a nice number.

Cc: stable
Signed-off-by: Stewart Smith <stewart at linux.vnet.ibm.com>
---
 core/opal.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/core/opal.c b/core/opal.c
index 61a2adb10602..269ab80df958 100644
--- a/core/opal.c
+++ b/core/opal.c
@@ -313,9 +313,10 @@ void opal_run_pollers(void)
 {
 	struct opal_poll_entry *poll_ent;
 	static int pollers_with_lock_warnings = 0;
+	static int poller_recursion = 0;
 
 	/* Don't re-enter on this CPU */
-	if (this_cpu()->in_poller) {
+	if (this_cpu()->in_poller && poller_recursion < 16) {
 		/**
 		 * @fwts-label OPALPollerRecursion
 		 * @fwts-advice Recursion detected in opal_run_pollers(). This
@@ -324,6 +325,9 @@ void opal_run_pollers(void)
 		 */
 		prlog(PR_ERR, "OPAL: Poller recursion detected.\n");
 		backtrace();
+		poller_recursion++;
+		if (poller_recursion == 16)
+			prlog(PR_ERR, "OPAL: Squashing future poller recursion warnings (>16).\n");
 		return;
 	}
 	this_cpu()->in_poller = true;
-- 
2.1.4