linux-kernel - [PATCH v2 3/4] swiotlb: Emit diagnostic in swiotlb

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Message-Id: <20210720133826.9075-4-will@kernel.org>
Date:   Tue, 20 Jul 2021 14:38:25 +0100
From:   Will Deacon <will@...nel.org>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Claire Chang <tientzu@...omium.org>,
        Christoph Hellwig <hch@....de>,
        Robin Murphy <robin.murphy@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH v2 3/4] swiotlb: Emit diagnostic in swiotlb_exit()

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@...omium.org>
Cc: Christoph Hellwig <hch@....de>
Cc: Robin Murphy <robin.murphy@....com>
Link: https://lore.kernel.org/r/20210705190352.GA19461@willie-the-truck
Suggested-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Tested-by: Nathan Chancellor <nathan@...nel.org>
Tested-by: Claire Chang <tientzu@...omium.org>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Will Deacon <will@...nel.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