selftests/powerpc/ptrace: Make child errors more obvious

Use the FAIL_IF() macro so that errors in the child report a line
number, rather than just silently exiting.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220627140239.2464900-11-mpe@ellerman.id.au

diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.c b/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.c
index 4e7a7eb..b574ea2 100644 (file)
--- a/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.c
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.c
@@ -19,7 +19,7 @@ double c = FPR_3;
 extern void gpr_child_loop(int *read_flag, int *write_flag,
                           unsigned long *gpr_buf, double *fpr_buf);
 
-void gpr(void)
+static int child(void)
 {
        unsigned long gpr_buf[32];
        double fpr_buf[32];
@@ -38,13 +38,10 @@ void gpr(void)
 
        shmdt((void *)cptr);
 
-       if (validate_gpr(gpr_buf, GPR_3))
-               exit(1);
+       FAIL_IF(validate_gpr(gpr_buf, GPR_3));
+       FAIL_IF(validate_fpr_double(fpr_buf, c));
 
-       if (validate_fpr_double(fpr_buf, c))
-               exit(1);
-
-       exit(0);
+       return 0;
 }
 
 int trace_gpr(pid_t child)
@@ -76,7 +73,7 @@ int ptrace_gpr(void)
                return TEST_FAIL;
        }
        if (pid == 0)
-               gpr();
+               exit(child());
 
        if (pid) {
                pptr = (int *)shmat(shm_id, NULL, 0);