linux-kernel - [PATCH v2] KVM: allow KVM_BUG/KVM_BUG

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Message-Id: <20230307135233.54684-1-wei.w.wang@intel.com>
Date:   Tue,  7 Mar 2023 21:52:33 +0800
From:   Wei Wang <wei.w.wang@...el.com>
To:     seanjc@...gle.com, dmatlack@...gle.com, mizhang@...gle.com,
        isaku.yamahata@...il.com, pbonzini@...hat.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Wang <wei.w.wang@...el.com>
Subject: [PATCH v2] KVM: allow KVM_BUG/KVM_BUG_ON to handle 64-bit cond

Current KVM_BUG and KVM_BUG_ON assume that 'cond' passed from callers is
32-bit as it casts 'cond' to the type of int. This will be wrong if 'cond'
provided by a caller is 64-bit, e.g. an error code of 0xc0000d0300000000
will be converted to 0, which is not expected.

Improves the implementation by using bool in KVM_BUG and KVM_BUG_ON.
'bool' is preferred to 'int' as __ret is essentially used as a boolean
and coding-stytle.rst documents that use of bool is encouraged to improve
readability and is often a better option than 'int' for storing boolean
values.

Fixes: 0b8f11737cff ("KVM: Add infrastructure and macro to mark VM as bugged")
Signed-off-by: Wei Wang <wei.w.wang@...el.com>
---
 include/linux/kvm_host.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f06635b24bd0..0221a48b3e3d 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -881,7 +881,7 @@ static inline void kvm_vm_bugged(struct kvm *kvm)
 
 #define KVM_BUG(cond, kvm, fmt...)				\
 ({								\
-	int __ret = (cond);					\
+	bool __ret = !!(cond);					\
 								\
 	if (WARN_ONCE(__ret && !(kvm)->vm_bugged, fmt))		\
 		kvm_vm_bugged(kvm);				\
@@ -890,7 +890,7 @@ static inline void kvm_vm_bugged(struct kvm *kvm)
 
 #define KVM_BUG_ON(cond, kvm)					\
 ({								\
-	int __ret = (cond);					\
+	bool __ret = !!(cond);					\
 								\
 	if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged))		\
 		kvm_vm_bugged(kvm);				\
-- 
2.27.0