linux-kernel - [PATCH v2 1/1] of: unittest: fix warning on PowerPC frame size warning

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Message-Id: <20211210184636.7273-2-jim2101024@gmail.com>
Date:   Fri, 10 Dec 2021 13:46:35 -0500
From:   Jim Quinlan <jim2101024@...il.com>
To:     Christoph Hellwig <hch@....de>,
        bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com,
        james.quinlan@...adcom.com
Cc:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 1/1] of: unittest: fix warning on PowerPC frame size warning

The struct device variable "dev_bogus" was triggering this warning
on a PowerPC build:

    drivers/of/unittest.c: In function 'of_unittest_dma_ranges_one.constprop':
    [...] >> The frame size of 1424 bytes is larger than 1024 bytes
             [-Wframe-larger-than=]

This variable is now dynamically allocated.

Fixes: e0d072782c734 ("dma-mapping: introduce DMA range map, supplanting dma_pfn_offset")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Jim Quinlan <jim2101024@...il.com>
---
 drivers/of/unittest.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 481ba8682ebf..02c5cd06ad19 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -911,11 +911,18 @@ static void __init of_unittest_dma_ranges_one(const char *path,
 	if (!rc) {
 		phys_addr_t	paddr;
 		dma_addr_t	dma_addr;
-		struct device	dev_bogus;
+		struct device	*dev_bogus;
 
-		dev_bogus.dma_range_map = map;
-		paddr = dma_to_phys(&dev_bogus, expect_dma_addr);
-		dma_addr = phys_to_dma(&dev_bogus, expect_paddr);
+		dev_bogus = kzalloc(sizeof(struct device), GFP_KERNEL);
+		if (!dev_bogus) {
+			unittest(0, "kzalloc() failed\n");
+			kfree(map);
+			return;
+		}
+
+		dev_bogus->dma_range_map = map;
+		paddr = dma_to_phys(dev_bogus, expect_dma_addr);
+		dma_addr = phys_to_dma(dev_bogus, expect_paddr);
 
 		unittest(paddr == expect_paddr,
 			 "of_dma_get_range: wrong phys addr %pap (expecting %llx) on node %pOF\n",
@@ -925,6 +932,7 @@ static void __init of_unittest_dma_ranges_one(const char *path,
 			 &dma_addr, expect_dma_addr, np);
 
 		kfree(map);
+		kfree(dev_bogus);
 	}
 	of_node_put(np);
 #endif
-- 
2.17.1