GCC9 for ARM produces the following warnings:
drivers/usb/gadget/composite.c: In function 'bos_desc':
drivers/usb/gadget/composite.c:522:15: warning: taking address of packed member of 'struct usb_bos_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member]
522 | le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
| ^~~~~~~~~~~~~~~~~~
drivers/usb/gadget/composite.c:534:15: warning: taking address of packed member of 'struct usb_bos_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member]
534 | le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
| ^~~~~~~~~~~~~~~~~~
drivers/usb/gadget/composite.c: In function 'get_string':
drivers/usb/gadget/composite.c:928:23: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member]
928 | collect_langs(sp, s->wData);
| ~^~~~~~~
drivers/usb/gadget/composite.c:933:24: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member]
933 | collect_langs(sp, s->wData);
| ~^~~~~~~
drivers/usb/gadget/composite.c:938:25: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member]
938 | collect_langs(sp, s->wData);
| ~^~~~~~~
drivers/usb/gadget/composite.c:945:23: warning: taking address of packed member of 'struct usb_string_descriptor' may result in an unaligned pointer value [-Waddress-of-packed-member]
945 | collect_langs(sp, s->wData);
| ~^~~~~~~
the offending code seems OK and there doesn't seem to be a way to fix
this in code, so disable the warning for that file.
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
drivers/usb/gadget/Makefile | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 9ef594575b..8d399e568f 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -1,4 +1,6 @@
+CFLAGS_composite.o := -Wno-address-of-packed-member
+
obj-$(CONFIG_USB_GADGET) += composite.o config.o usbstring.o epautoconf.o udc-core.o functions.o config.o multi.o
obj-$(CONFIG_USB_GADGET_SERIAL) += u_serial.o serial.o f_serial.o f_acm.o
obj-$(CONFIG_USB_GADGET_DFU) += dfu.o
--
2.21.0
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