scsi: ufs: core: Fix the build for gcc 9 and before

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 <[email protected]>
Cc: Naresh Kamboju <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Reported-by: Naresh Kamboju <[email protected]>
Closes: https://lore.kernel.org/linux-scsi/CA+G9fYur8UJoUyTLJFVEJPh-15TJ7kbdD2q8xVz8a3fLjkxxVw@mail.gmail.com/
Suggested-by: Arnd Bergmann <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Tested-by: Arnd Bergmann <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: bvanassche

drivers/ufs/core/ufshcd.c

@@ -10527,6 +10527,14 @@ static const struct dev_pm_ops ufshcd_wl_pm_ops = {
 
 static void ufshcd_check_header_layout(void)
 {
+	/*
+	 * gcc compilers before version 10 cannot do constant-folding for
+	 * sub-byte bitfields. Hence skip the layout checks for gcc 9 and
+	 * before.
+	 */
+	if (IS_ENABLED(CONFIG_CC_IS_GCC) && CONFIG_GCC_VERSION < 100000)
+		return;
+
 	BUILD_BUG_ON(((u8 *)&(struct request_desc_header){
 				.cci = 3})[0] != 3);