selftests/powerpc: Fix fpu_signal failures

My recent commit e5d00aaac651 ("selftests/powerpc: Check all FPRs in
fpu_preempt") inadvertently broke the fpu_signal test.

It needs to take into account that fpu_preempt now loads 32 FPRs, so
enlarge darray.

Also use the newly added randomise_darray() to properly randomise darray.

Finally the checking done in signal_fpu_sig() needs to skip checking
f30/f31, because they are used as scratch registers in check_all_fprs(),
called by preempt_fpu(), and so could hold other values when the signal
is taken.

Fixes: e5d00aaac651 ("selftests/powerpc: Check all FPRs in fpu_preempt")
Reported-by: Spoorthy <spoorthy@linux.ibm.com>
Depends-on: 2ba107f6795d ("selftests/powerpc: Generate better bit patterns for FPU tests")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240301101035.1230024-1-mpe@ellerman.id.au

diff --git a/tools/testing/selftests/powerpc/math/fpu_signal.c b/tools/testing/selftests/powerpc/math/fpu_signal.c
index 7b1addd504209fadb59f908a843b23a9d0218f3f..8a64f63e37ce215e4aeff2675b7114704075ae48 100644 (file)
--- a/tools/testing/selftests/powerpc/math/fpu_signal.c
+++ b/tools/testing/selftests/powerpc/math/fpu_signal.c
@@ -18,6 +18,7 @@
 #include <pthread.h>
 
 #include "utils.h"
+#include "fpu.h"
 
 /* Number of times each thread should receive the signal */
 #define ITERATIONS 10
@@ -27,9 +28,7 @@
  */
 #define THREAD_FACTOR 8
 
-__thread double darray[] = {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
-                    1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0,
-                    2.1};
+__thread double darray[32];
 
 bool bad_context;
 int threads_starting;
@@ -43,9 +42,9 @@ void signal_fpu_sig(int sig, siginfo_t *info, void *context)
        ucontext_t *uc = context;
        mcontext_t *mc = &uc->uc_mcontext;
 
-       /* Only the non volatiles were loaded up */
-       for (i = 14; i < 32; i++) {
-               if (mc->fp_regs[i] != darray[i - 14]) {
+       // Don't check f30/f31, they're used as scratches in check_all_fprs()
+       for (i = 0; i < 30; i++) {
+               if (mc->fp_regs[i] != darray[i]) {
                        bad_context = true;
                        break;
                }
@@ -54,7 +53,6 @@ void signal_fpu_sig(int sig, siginfo_t *info, void *context)
 
 void *signal_fpu_c(void *p)
 {
-       int i;
        long rc;
        struct sigaction act;
        act.sa_sigaction = signal_fpu_sig;
@@ -64,9 +62,7 @@ void *signal_fpu_c(void *p)
                return p;
 
        srand(pthread_self());
-       for (i = 0; i < 21; i++)
-               darray[i] = rand();
-
+       randomise_darray(darray, ARRAY_SIZE(darray));
        rc = preempt_fpu(darray, &threads_starting, &running);
 
        return (void *) rc;