linux-kernel - [PATCH] mm: Drop "PFNs busy" printk in an expected path.

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Message-Id: <20161229023131.506-1-eric@anholt.net>
Date:   Wed, 28 Dec 2016 18:31:31 -0800
From:   Eric Anholt <eric@...olt.net>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>,
        linux-stable <stable@...r.kernel.org>
Subject: [PATCH] mm: Drop "PFNs busy" printk in an expected path.

For CMA allocations, we expect to occasionally hit this error path, at
which point CMA will retry.  Given that, we shouldn't be spamming
dmesg about it.

The Raspberry Pi graphics driver does frequent CMA allocations, and
during regression testing this printk was sometimes occurring 100s of
times per second.

Signed-off-by: Eric Anholt <eric@...olt.net>
Cc: linux-stable <stable@...r.kernel.org>
---
 mm/page_alloc.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6de9440e3ae2..bea7204c14a5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7289,8 +7289,6 @@ int alloc_contig_range(unsigned long start, unsigned long end,
 
 	/* Make sure the range is really isolated. */
 	if (test_pages_isolated(outer_start, end, false)) {
-		pr_info("%s: [%lx, %lx) PFNs busy\n",
-			__func__, outer_start, end);
 		ret = -EBUSY;
 		goto done;
 	}
-- 
2.11.0