linux-kernel - [PATCH v2 2/4] xen-pcifront: Align address of flags to size of unsigned long

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Message-Id: <1574710984-208305-3-git-send-email-fenghua.yu@intel.com>
Date:   Mon, 25 Nov 2019 11:43:02 -0800
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "H Peter Anvin" <hpa@...or.com>,
        "Andy Lutomirski" <luto@...nel.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "David Laight" <David.Laight@...LAB.COM>,
        "Ashok Raj" <ashok.raj@...el.com>,
        "Tony Luck" <tony.luck@...el.com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v2 2/4] xen-pcifront: Align address of flags to size of unsigned long

The address of "flags" is passed to atomic bitops which require the
address is aligned to size of unsigned long.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 include/xen/interface/io/pciif.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/xen/interface/io/pciif.h b/include/xen/interface/io/pciif.h
index d9922ae36eb5..639d5fb484a3 100644
--- a/include/xen/interface/io/pciif.h
+++ b/include/xen/interface/io/pciif.h
@@ -103,8 +103,11 @@ struct xen_pcie_aer_op {
 	uint32_t devfn;
 };
 struct xen_pci_sharedinfo {
-	/* flags - XEN_PCIF_* */
-	uint32_t flags;
+	/* flags - XEN_PCIF_*. Force alignment for atomic bit operations. */
+	union {
+		uint32_t	flags;
+		unsigned long	flags_alignment;
+	};
 	struct xen_pci_op op;
 	struct xen_pcie_aer_op aer_op;
 };
-- 
2.19.1