"basic_test" only asserts that RSEQ works moderately correctly. E.g. that the CPUID pointer works.

Signed-off-by: Mathieu Desnoyers mathieu.desnoyers@efficios.com CC: Shuah Khan shuahkh@osg.samsung.com CC: Russell King linux@arm.linux.org.uk CC: Catalin Marinas catalin.marinas@arm.com CC: Will Deacon will.deacon@arm.com CC: Thomas Gleixner tglx@linutronix.de CC: Paul Turner pjt@google.com CC: Andrew Hunter ahh@google.com CC: Peter Zijlstra peterz@infradead.org CC: Andy Lutomirski luto@amacapital.net CC: Andi Kleen andi@firstfloor.org CC: Dave Watson davejwatson@fb.com CC: Chris Lameter cl@linux.com CC: Ingo Molnar mingo@redhat.com CC: "H. Peter Anvin" hpa@zytor.com CC: Ben Maurer bmaurer@fb.com CC: Steven Rostedt rostedt@goodmis.org CC: "Paul E. McKenney" paulmck@linux.vnet.ibm.com CC: Josh Triplett josh@joshtriplett.org CC: Linus Torvalds torvalds@linux-foundation.org CC: Andrew Morton akpm@linux-foundation.org CC: Boqun Feng boqun.feng@gmail.com CC: linux-kselftest@vger.kernel.org CC: linux-api@vger.kernel.org --- tools/testing/selftests/rseq/basic_test.c | 56 +++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 tools/testing/selftests/rseq/basic_test.c

diff --git a/tools/testing/selftests/rseq/basic_test.c b/tools/testing/selftests/rseq/basic_test.c new file mode 100644 index 000000000000..d8efbfb89193 --- /dev/null +++ b/tools/testing/selftests/rseq/basic_test.c @@ -0,0 +1,56 @@ +// SPDX-License-Identifier: LGPL-2.1 +/* + * Basic test coverage for critical regions and rseq_current_cpu(). + */ + +#define _GNU_SOURCE +#include <assert.h> +#include <sched.h> +#include <signal.h> +#include <stdio.h> +#include <string.h> +#include <sys/time.h> + +#include "rseq.h" + +void test_cpu_pointer(void) +{ + cpu_set_t affinity, test_affinity; + int i; + + sched_getaffinity(0, sizeof(affinity), &affinity); + CPU_ZERO(&test_affinity); + for (i = 0; i < CPU_SETSIZE; i++) { + if (CPU_ISSET(i, &affinity)) { + CPU_SET(i, &test_affinity); + sched_setaffinity(0, sizeof(test_affinity), + &test_affinity); + assert(sched_getcpu() == i); + assert(rseq_current_cpu() == i); + assert(rseq_current_cpu_raw() == i); + assert(rseq_cpu_start() == i); + CPU_CLR(i, &test_affinity); + } + } + sched_setaffinity(0, sizeof(affinity), &affinity); +} + +int main(int argc, char **argv) +{ + if (rseq_register_current_thread()) { + fprintf(stderr, "Error: rseq_register_current_thread(...) failed(%d): %s\n", + errno, strerror(errno)); + goto init_thread_error; + } + printf("testing current cpu\n"); + test_cpu_pointer(); + if (rseq_unregister_current_thread()) { + fprintf(stderr, "Error: rseq_unregister_current_thread(...) failed(%d): %s\n", + errno, strerror(errno)); + goto init_thread_error; + } + return 0; + +init_thread_error: + return -1; +}