linux-kernel - [PATCH 3.16.y-ckt 32/71] arch/x86/kvm/mmu.c: work around gcc-4.4.4 bug

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Message-Id: <1435226570-3669-33-git-send-email-luis.henriques@canonical.com>
Date:	Thu, 25 Jun 2015 11:02:11 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Vinson Lee <vlee@...pensource.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 32/71] arch/x86/kvm/mmu.c: work around gcc-4.4.4 bug

3.16.7-ckt14 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrew Morton <akpm@...ux-foundation.org>

commit 5ec45a192fe6e287f0fc06d5ca4f3bd446d94803 upstream.

Fix this compile issue with gcc-4.4.4:

   arch/x86/kvm/mmu.c: In function 'kvm_mmu_pte_write':
   arch/x86/kvm/mmu.c:4256: error: unknown field 'cr0_wp' specified in initializer
   arch/x86/kvm/mmu.c:4257: error: unknown field 'cr4_pae' specified in initializer
   arch/x86/kvm/mmu.c:4257: warning: excess elements in union initializer
   ...

gcc-4.4.4 (at least) has issues when using anonymous unions in
initializers.

Fixes: edc90b7dc4ceef6 ("KVM: MMU: fix SMAP virtualization")
Cc: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Davidlohr Bueso <dave@...olabs.net>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Vinson Lee <vlee@...pensource.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 arch/x86/kvm/mmu.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 458ae4d1324d..59ff6e7f3bef 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4087,13 +4087,13 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 	u64 entry, gentry, *spte;
 	int npte;
 	bool remote_flush, local_flush, zap_page;
-	union kvm_mmu_page_role mask = (union kvm_mmu_page_role) {
-		.cr0_wp = 1,
-		.cr4_pae = 1,
-		.nxe = 1,
-		.smep_andnot_wp = 1,
-		.smap_andnot_wp = 1,
-	};
+	union kvm_mmu_page_role mask = { };
+
+	mask.cr0_wp = 1;
+	mask.cr4_pae = 1;
+	mask.nxe = 1;
+	mask.smep_andnot_wp = 1;
+	mask.smap_andnot_wp = 1;
 
 	/*
 	 * If we don't have indirect shadow pages, it means no page is
--
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