[LTP] [PATCH v2] Fix wqueue09 according with 5.17 kernel updates

[Andrea Cervesato]

Kernel 5.17 introduced many changes in the watch_queue support. In
particular, commit 3b4c0371928c17af03e8397ac842346624017ce6 changes the
behaviour of IOC_WATCH_QUEUE_SET_SIZE and ioctl control over watch_queue
buffer size: now we need to generate more events than before. In
particular, more than the bitmap size to the number of notes.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.de>
---
This patch fixes also the issue of loosing events on big number of iterations
such as -i 1000.

 testcases/kernel/watchqueue/wqueue09.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/testcases/kernel/watchqueue/wqueue09.c b/testcases/kernel/watchqueue/wqueue09.c
index 55d567249..e632be094 100644
--- a/testcases/kernel/watchqueue/wqueue09.c
+++ b/testcases/kernel/watchqueue/wqueue09.c
@@ -11,10 +11,13 @@
 
 #define _GNU_SOURCE
 
+#include <unistd.h>
 #include "tst_test.h"
 #include "lapi/keyctl.h"
 #include "common.h"
 
+#define WATCH_QUEUE_NOTE_SIZE 128
+
 static int data_lost;
 
 static void saw_data_loss(struct watch_notification *n,
@@ -29,14 +32,15 @@ static void saw_data_loss(struct watch_notification *n,
 
 static void run(void)
 {
-	int fd;
+	int fd, i, iterations;
 	key_serial_t key;
 
 	fd = wqueue_watch(1, &wqueue_filter);
-
 	key = wqueue_add_key(fd);
-	keyctl(KEYCTL_UPDATE, key, "b", 1);
-	keyctl(KEYCTL_REVOKE, key);
+
+	iterations = (getpagesize() / WATCH_QUEUE_NOTE_SIZE) * 2;
+	for (i = 0; i < iterations; i++)
+		keyctl(KEYCTL_UPDATE, key, "b", 1);
 
 	data_lost = 0;
 	while (!data_lost)
-- 
2.35.1