linux-kernel - [PATCH 5.18 0729/1095] KVM: arm64: Dont return from void function

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Date:   Mon, 15 Aug 2022 20:02:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Quentin Perret <qperret@...gle.com>,
        Marc Zyngier <maz@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0729/1095] KVM: arm64: Dont return from void function

From: Quentin Perret <qperret@...gle.com>

[ Upstream commit 1c3ace2b8b3995d3213c5e2d2aca01a0577a3b0f ]

Although harmless, the return statement in kvm_unexpected_el2_exception
is rather confusing as the function itself has a void return type. The
C standard is also pretty clear that "A return statement with an
expression shall not appear in a function whose return type is void".
Given that this return statement does not seem to add any actual value,
let's not pointlessly violate the standard.

Build-tested with GCC 10 and CLANG 13 for good measure, the disassembled
code is identical with or without the return statement.

Fixes: e9ee186bb735 ("KVM: arm64: Add kvm_extable for vaxorcism code")
Signed-off-by: Quentin Perret <qperret@...gle.com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20220705142310.3847918-1-qperret@google.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm64/kvm/hyp/nvhe/switch.c | 2 +-
 arch/arm64/kvm/hyp/vhe/switch.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c
index 6410d21d8695..858e5be48791 100644
--- a/arch/arm64/kvm/hyp/nvhe/switch.c
+++ b/arch/arm64/kvm/hyp/nvhe/switch.c
@@ -371,5 +371,5 @@ void __noreturn hyp_panic(void)
 
 asmlinkage void kvm_unexpected_el2_exception(void)
 {
-	return __kvm_unexpected_el2_exception();
+	__kvm_unexpected_el2_exception();
 }
diff --git a/arch/arm64/kvm/hyp/vhe/switch.c b/arch/arm64/kvm/hyp/vhe/switch.c
index 262dfe03134d..51ea9ac71210 100644
--- a/arch/arm64/kvm/hyp/vhe/switch.c
+++ b/arch/arm64/kvm/hyp/vhe/switch.c
@@ -240,5 +240,5 @@ void __noreturn hyp_panic(void)
 
 asmlinkage void kvm_unexpected_el2_exception(void)
 {
-	return __kvm_unexpected_el2_exception();
+	__kvm_unexpected_el2_exception();
 }
-- 
2.35.1