GCC 9.x starts complaining about potential misalignment of the pointer to the
array (in this case alignment=2) in the packed (alignment=1) structures.
drivers/usb/gadget/composite.c:545:23: warning: taking address of packed member
of ‘struct usb_string_descriptor’ may result in an unaligned pointer value
[-Waddress-of-packed-member]
545 | collect_langs(sp, s->wData);
drivers/usb/gadget/composite.c:550:24: warning: taking address of packed member
of ‘struct usb_string_descriptor’ may result in an unaligned pointer value
[-Waddress-of-packed-member]
550 | collect_langs(sp, s->wData);
drivers/usb/gadget/composite.c:555:25: warning: taking address of packed member
of ‘struct usb_string_descriptor’ may result in an unaligned pointer value
[-Waddress-of-packed-member]
555 | collect_langs(sp, s->wData);
Define structure alignment to be 2 to guarantee alignment of its members.
Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---
include/linux/usb/ch9.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index 264c9712a3..a9b3c2709a 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -336,7 +336,7 @@ struct usb_string_descriptor {
__u8 bDescriptorType;
__le16 wData[1]; /* UTF-16LE encoded */
-} __attribute__ ((packed));
+} __attribute__ ((packed, aligned(2)));
/* note that "string" zero is special, it holds language codes that
* the device supports, not Unicode characters.
--
2.23.0.rc1
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