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From:   Will Deacon <will@kernel.org>
To:     iommu@lists.linux-foundation.org
Cc:     linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Claire Chang <tientzu@chromium.org>,
        Christoph Hellwig <hch@lst.de>,
        Robin Murphy <robin.murphy@arm.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH 4/5] swiotlb: Emit diagnostic in swiotlb_exit()
Date:   Mon, 19 Jul 2021 13:30:53 +0100
Message-Id: <20210719123054.6844-5-will@kernel.org>
In-Reply-To: <20210719123054.6844-1-will@kernel.org>
References: <20210719123054.6844-1-will@kernel.org>
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A recent debugging session would have been made a little bit easier if
we had noticed sooner that swiotlb_exit() was being called during boot.

Add a simple diagnostic message to swiotlb_exit() to complement the one
from swiotlb_print_info() during initialisation.

Cc: Claire Chang <tientzu@chromium.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20210705190352.GA19461@willie-the-truck
Suggested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
---
 kernel/dma/swiotlb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 7948f274f9bb..b3c793ed9e64 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -334,6 +334,7 @@ void __init swiotlb_exit(void)
 	if (!mem->nslabs)
 		return;
 
+	pr_info("tearing down default memory pool\n");
 	size = array_size(sizeof(*mem->slots), mem->nslabs);
 	if (mem->late_alloc)
 		free_pages((unsigned long)mem->slots, get_order(size));
-- 
2.32.0.402.g57bb445576-goog