Commit 71443210 authored by Sean Christopherson's avatar Sean Christopherson
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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@google.com>
Link: https://lore.kernel.org/r/20250516215909.2551628-5-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent ba300a72

tools/testing/selftests/kvm/access_tracking_perf_test.c

+2 −5
Original line number Diff line number Diff line
@@ -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. "

		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");