linux-kernel - [PATCH MANUALSEL 5.15 2/7] KVM: selftests: Silence compiler warning in the kvm_page_table

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Message-Id: <20220427155431.19458-2-sashal@kernel.org>
Date:   Wed, 27 Apr 2022 11:54:22 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Thomas Huth <thuth@...hat.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <sashal@...nel.org>, shuah@...nel.org,
        kvm@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH MANUALSEL 5.15 2/7] KVM: selftests: Silence compiler warning in the kvm_page_table_test

From: Thomas Huth <thuth@...hat.com>

[ Upstream commit 266a19a0bc4fbfab4d981a47640ca98972a01865 ]

When compiling kvm_page_table_test.c, I get this compiler warning
with gcc 11.2:

kvm_page_table_test.c: In function 'pre_init_before_test':
../../../../tools/include/linux/kernel.h:44:24: warning: comparison of
 distinct pointer types lacks a cast
   44 |         (void) (&_max1 == &_max2);              \
      |                        ^~
kvm_page_table_test.c:281:21: note: in expansion of macro 'max'
  281 |         alignment = max(0x100000, alignment);
      |                     ^~~

Fix it by adjusting the type of the absolute value.

Signed-off-by: Thomas Huth <thuth@...hat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
Message-Id: <20220414103031.565037-1-thuth@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/kvm/kvm_page_table_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/kvm_page_table_test.c b/tools/testing/selftests/kvm/kvm_page_table_test.c
index 36407cb0ec85..f1ddfe4c4a03 100644
--- a/tools/testing/selftests/kvm/kvm_page_table_test.c
+++ b/tools/testing/selftests/kvm/kvm_page_table_test.c
@@ -278,7 +278,7 @@ static struct kvm_vm *pre_init_before_test(enum vm_guest_mode mode, void *arg)
 	else
 		guest_test_phys_mem = p->phys_offset;
 #ifdef __s390x__
-	alignment = max(0x100000, alignment);
+	alignment = max(0x100000UL, alignment);
 #endif
 	guest_test_phys_mem &= ~(alignment - 1);
 
-- 
2.35.1