[PATCH AUTOSEL 5.4 03/23] dma-debug: make things less spammy under memory pressure

From: Sasha Levin
Date: Mon Jun 13 2022 - 22:22:07 EST


From: Rob Clark <robdclark@xxxxxxxxxxxx>

[ 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@xxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
kernel/dma/debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index 4dc3bbfd3e3f..e1a7d55ee33a 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -616,7 +616,7 @@ 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;
}

--
2.35.1