Print whether extensible size feature is supported by the kernel and __rseq_abi definition, along with the contents of the kernel_size field if it is available.
Signed-off-by: Mathieu Desnoyers <[email protected]> --- tools/testing/selftests/rseq/basic_test.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tools/testing/selftests/rseq/basic_test.c b/tools/testing/selftests/rseq/basic_test.c index d8efbfb89193..976e040574a1 100644 --- a/tools/testing/selftests/rseq/basic_test.c +++ b/tools/testing/selftests/rseq/basic_test.c @@ -10,6 +10,7 @@ #include <stdio.h> #include <string.h> #include <sys/time.h> +#include <inttypes.h> #include "rseq.h" @@ -35,6 +36,17 @@ void test_cpu_pointer(void) sched_setaffinity(0, sizeof(affinity), &affinity); } +static void print_rseq_size(void) +{ + bool supported = (__rseq_abi.flags & RSEQ_TLS_FLAG_SIZE) && __rseq_abi.kernel_size != 0; + + printf("extensible struct rseq supported: %s", + supported ? "yes" : "no"); + if (supported) + printf(" (kernel_size=%" PRIu16 ")", __rseq_abi.kernel_size); + printf("\n"); +} + int main(int argc, char **argv) { if (rseq_register_current_thread()) { @@ -42,6 +54,9 @@ int main(int argc, char **argv) errno, strerror(errno)); goto init_thread_error; } + + print_rseq_size(); + printf("testing current cpu\n"); test_cpu_pointer(); if (rseq_unregister_current_thread()) { -- 2.17.1
