linux-kernel - [PATCH rdma-next 4/4] gcov: Don't print out-of-memory print for all failed files

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Date:   Wed,  2 Sep 2020 11:55:13 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>
Cc:     Leon Romanovsky <leonro@...dia.com>, linux-kernel@...r.kernel.org,
        Colin Ian King <colin.king@...onical.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH rdma-next 4/4] gcov: Don't print out-of-memory print for all failed files

From: Leon Romanovsky <leonro@...dia.com>

Once GCOV fails to duplicate information, the following error is
printed:
 gcov: could not save data for '/home/leonro/src/kernel/drivers/infiniband/hw/mlx5/std_types.gcda' (out of memory)

In the event of out-of-memory such prints are seen for almost every kernel
file, so instead of spamming dmesg, we print the first failure and inform
the user that future prints are suppressed.

Cc: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 kernel/gcov/fs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/gcov/fs.c b/kernel/gcov/fs.c
index 82babf5aa077..b74d426ca99e 100644
--- a/kernel/gcov/fs.c
+++ b/kernel/gcov/fs.c
@@ -685,8 +685,9 @@ static void save_info(struct gcov_node *node, struct gcov_info *info)
 	else {
 		node->unloaded_info = gcov_info_dup(info);
 		if (!node->unloaded_info) {
-			pr_warn("could not save data for '%s' "
-				"(out of memory)\n",
+			pr_warn_once(
+				"could not save data for first file '%s' "
+				"(out of memory), other files are suppressed\n",
 				gcov_info_filename(info));
 		}
 	}
--
2.26.2