linux-kernel - [PATCH] kvm: selftest: fix noop test in guest_memfd

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Message-ID: <20241024095956.3668818-1-roypat@amazon.co.uk>
Date: Thu, 24 Oct 2024 10:59:53 +0100
From: Patrick Roy <roypat@...zon.co.uk>
To: <pbonzini@...hat.com>, <shuah@...nel.org>, <kvm@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Patrick Roy <roypat@...zon.co.uk>, <chao.p.peng@...ux.intel.com>,
	<ackerleytng@...gle.com>, <seanjc@...gle.com>, <graf@...zon.com>,
	<jgowans@...zon.com>
Subject: [PATCH] kvm: selftest: fix noop test in guest_memfd_test.c

The loop in test_create_guest_memfd_invalid that is supposed to test
that nothing is accepted as a valid flag to KVM_CREATE_GUEST_MEMFD was
initializing `flag` as 0 instead of BIT(0). This caused the loop to
immediately exit instead of iterating over BIT(0), BIT(1), ... .

Fixes: 8a89efd43423 ("KVM: selftests: Add basic selftest for guest_memfd()")
Signed-off-by: Patrick Roy <roypat@...zon.co.uk>
---
 tools/testing/selftests/kvm/guest_memfd_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c
index ba0c8e9960358..ce687f8d248fc 100644
--- a/tools/testing/selftests/kvm/guest_memfd_test.c
+++ b/tools/testing/selftests/kvm/guest_memfd_test.c
@@ -134,7 +134,7 @@ static void test_create_guest_memfd_invalid(struct kvm_vm *vm)
 			    size);
 	}
 
-	for (flag = 0; flag; flag <<= 1) {
+	for (flag = BIT(0); flag; flag <<= 1) {
 		fd = __vm_create_guest_memfd(vm, page_size, flag);
 		TEST_ASSERT(fd == -1 && errno == EINVAL,
 			    "guest_memfd() with flag '0x%lx' should fail with EINVAL",
-- 
2.47.0