linux-kernel - [PATCH] kvm/emulate: fix a -Werror=cast-function-type

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Date:   Fri, 14 Feb 2020 10:56:08 -0500
From:   Qian Cai <cai@....pw>
To:     pbonzini@...hat.com
Cc:     sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH] kvm/emulate: fix a -Werror=cast-function-type

arch/x86/kvm/emulate.c: In function 'x86_emulate_insn':
arch/x86/kvm/emulate.c:5686:22: error: cast between incompatible
function types from 'int (*)(struct x86_emulate_ctxt *)' to 'void
(*)(struct fastop *)' [-Werror=cast-function-type]
    rc = fastop(ctxt, (fastop_t)ctxt->execute);

Fixes: 3009afc6e39e ("KVM: x86: Use a typedef for fastop functions")
Signed-off-by: Qian Cai <cai@....pw>
---
 arch/x86/kvm/emulate.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index ddbc61984227..17ae820cf59d 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -5682,10 +5682,12 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 		ctxt->eflags &= ~X86_EFLAGS_RF;
 
 	if (ctxt->execute) {
-		if (ctxt->d & Fastop)
-			rc = fastop(ctxt, (fastop_t)ctxt->execute);
-		else
+		if (ctxt->d & Fastop) {
+			fastop_t fop = (void *)ctxt->execute;
+			rc = fastop(ctxt, fop);
+		} else {
 			rc = ctxt->execute(ctxt);
+		}
 		if (rc != X86EMUL_CONTINUE)
 			goto done;
 		goto writeback;
-- 
1.8.3.1