gcc compilers before version 10 cannot do constant-folding for sub-byte
bitfields. This makes the compiler layout tests fail. Hence skip the
layout checks for gcc 9 and before.
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>
Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>
Suggested-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
drivers/ufs/core/ufshcd.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 23335aaa6a66..875c860bcc05 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -10564,6 +10564,15 @@ static const struct dev_pm_ops ufshcd_wl_pm_ops = {
static void ufshcd_check_header_layout(void)
{
+#if defined(__GNUC__) && __GNUC__ -0 < 10
+ /*
+ * gcc compilers before version 10 cannot do constant-folding for
+ * sub-byte bitfields. Hence skip the layout checks for gcc 9 and
+ * before.
+ */
+ return;
+#endif
+
BUILD_BUG_ON(((u8 *)&(struct request_desc_header){
.cci = 3})[0] != 3);
