linux-kernel - [tip: x86/apic] iommu/amd: Fix union of bitfields in intcapxt support

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Date:   Wed, 11 Nov 2020 22:06:37 -0000
From:   "tip-bot2 for David Woodhouse" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     David Woodhouse <dwmw@...zon.co.uk>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/apic] iommu/amd: Fix union of bitfields in intcapxt support

The following commit has been merged into the x86/apic branch of tip:

Commit-ID:     2fb6acf3edfeb904505f9ba3fd01166866062591
Gitweb:        https://git.kernel.org/tip/2fb6acf3edfeb904505f9ba3fd01166866062591
Author:        David Woodhouse <dwmw@...zon.co.uk>
AuthorDate:    Wed, 11 Nov 2020 14:43:21 
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 11 Nov 2020 23:01:57 +01:00

iommu/amd: Fix union of bitfields in intcapxt support

All the bitfields in here are overlaid on top of each other since
they're a union. Change the second u64 to be in a struct so it does
the intended thing.

Fixes: b5c3786ee370 ("iommu/amd: Use msi_msg shadow structs")
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20201111144322.1659970-2-dwmw2@infradead.org

---
 drivers/iommu/amd/init.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 263670d..c2769f2 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -1967,13 +1967,15 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
 
 union intcapxt {
 	u64	capxt;
-	u64	reserved_0		:  2,
-		dest_mode_logical	:  1,
-		reserved_1		:  5,
-		destid_0_23		: 24,
-		vector			:  8,
-		reserved_2		: 16,
-		destid_24_31		:  8;
+	struct {
+		u64	reserved_0		:  2,
+			dest_mode_logical	:  1,
+			reserved_1		:  5,
+			destid_0_23		: 24,
+			vector			:  8,
+			reserved_2		: 16,
+			destid_24_31		:  8;
+	};
 } __attribute__ ((packed));
 
 /*