linux-kernel - [PATCH 6/8] vop: Fix handling of >32 feature bits

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Date:   Wed, 16 Jan 2019 17:32:51 +0100
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     sudeep.dutt@...el.com, ashutosh.dixit@...el.com,
        gregkh@...uxfoundation.org, arnd@...db.de
Cc:     linux-kernel@...r.kernel.org, Vincent Whitchurch <rabinv@...s.com>
Subject: [PATCH 6/8] vop: Fix handling of >32 feature bits

This is needed, for example, for VIRTIO_F_IOMMU_PLATFORM.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---
 drivers/misc/mic/vop/vop_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/mic/vop/vop_main.c b/drivers/misc/mic/vop/vop_main.c
index 26b23f2cf94c..dd49169ef53d 100644
--- a/drivers/misc/mic/vop/vop_main.c
+++ b/drivers/misc/mic/vop/vop_main.c
@@ -117,7 +117,7 @@ _vop_total_desc_size(struct mic_device_desc __iomem *desc)
 static u64 vop_get_features(struct virtio_device *vdev)
 {
 	unsigned int i, bits;
-	u32 features = 0;
+	u64 features = 0;
 	struct mic_device_desc __iomem *desc = to_vopvdev(vdev)->desc;
 	u8 __iomem *in_features = _vop_vq_features(desc);
 	int feature_len = ioread8(&desc->feature_len);
@@ -125,7 +125,7 @@ static u64 vop_get_features(struct virtio_device *vdev)
 	bits = min_t(unsigned, feature_len, sizeof(vdev->features)) * 8;
 	for (i = 0; i < bits; i++)
 		if (ioread8(&in_features[i / 8]) & (BIT(i % 8)))
-			features |= BIT(i);
+			features |= BIT_ULL(i);
 
 	return features;
 }
-- 
2.20.0