From: Rob Clark <robdclark@chromium.org>
Date: Wed, 1 Jun 2022 14:51:16 +0000 (-0700)
Subject: dma-debug: make things less spammy under memory pressure
X-Git-Tag: v5.10.124~77
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d7be05aff27278c89c5c2d5518e235a315ce447a;p=thirdparty%2Fkernel%2Fstable.git

dma-debug: make things less spammy under memory pressure

[ Upstream commit e19f8fa6ce1ca9b8b934ba7d2e8f34c95abc6e60 ]

Limit the error msg to avoid flooding the console.  If you have a lot of
threads hitting this at once, they could have already gotten passed the
dma_debug_disabled() check before they get to the point of allocation
failure, resulting in quite a lot of this error message spamming the
log.  Use pr_err_once() to limit that.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index ee7da1f2462f5..ae9fc1ee6d206 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -564,7 +564,7 @@ static void add_dma_entry(struct dma_debug_entry *entry)
 
 	rc = active_cacheline_insert(entry);
 	if (rc == -ENOMEM) {
-		pr_err("cacheline tracking ENOMEM, dma-debug disabled\n");
+		pr_err_once("cacheline tracking ENOMEM, dma-debug disabled\n");
 		global_disable = true;
 	}