linux-kernel - [PATCH 4/4] KVM: selftests: Print a more helpful message for EACCESS in access tracking test

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Message-ID: <20250516215909.2551628-5-seanjc@google.com>
Date: Fri, 16 May 2025 14:59:09 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	James Houghton <jthoughton@...gle.com>
Subject: [PATCH 4/4] KVM: selftests: Print a more helpful message for EACCESS
 in access tracking test

Use open_path_or_exit() helper to probe /sys/kernel/mm/page_idle/bitmap in
the access tracking perf test so that a helpful/pertinent SKIP message is
printed if the file exists but is inaccessible, e.g. because the file has
the kernel's default 0600 permissions.

Cc: James Houghton <jthoughton@...gle.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/access_tracking_perf_test.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/kvm/access_tracking_perf_test.c b/tools/testing/selftests/kvm/access_tracking_perf_test.c
index da7196fd1b23..c9de66537ec3 100644
--- a/tools/testing/selftests/kvm/access_tracking_perf_test.c
+++ b/tools/testing/selftests/kvm/access_tracking_perf_test.c
@@ -596,11 +596,8 @@ int main(int argc, char *argv[])
 		if (ret)
 			return ret;
 	} else {
-		page_idle_fd = open("/sys/kernel/mm/page_idle/bitmap", O_RDWR);
-		__TEST_REQUIRE(page_idle_fd >= 0,
-			       "Couldn't open /sys/kernel/mm/page_idle/bitmap. "
-			       "Is CONFIG_IDLE_PAGE_TRACKING enabled?");
-
+		page_idle_fd = __open_path_or_exit("/sys/kernel/mm/page_idle/bitmap", O_RDWR,
+						   "Is CONFIG_IDLE_PAGE_TRACKING enabled?");
 		close(page_idle_fd);
 
 		puts("Using page_idle for aging");
-- 
2.49.0.1112.g889b7c5bd8-goog