Subject: linux-next: build warning after merge of the net-next tree

From: Stephen Rothwell <[email-masked]>
Date: Fri, 13 Mar 2020 20:54:15 +1100

Hi all,

After merging the net-next tree, today's linux-next build (powerpc
allyesconfig) produced this warning:

In file included from include/linux/byteorder/big_endian.h:5,
                 from arch/powerpc/include/uapi/asm/byteorder.h:14,
                 from include/asm-generic/bitops/le.h:6,
                 from arch/powerpc/include/asm/bitops.h:250,
                 from include/linux/bitops.h:29,
                 from include/linux/kernel.h:12,
                 from include/linux/list.h:9,
                 from include/linux/module.h:12,
                 from drivers/net/usb/cdc_ncm.c:41:
drivers/net/usb/cdc_ncm.c: In function 'cdc_ncm_ndp32':
include/uapi/linux/byteorder/big_endian.h:33:26: warning: conversion from 'unsigned int' to '__le16' {aka 'short unsigned int'} changes value from '402653184' to '0' [-Woverflow]
   33 | #define __cpu_to_le32(x) ((__force __le32)__swab32((x)))
      |                          ^
include/linux/byteorder/generic.h:88:21: note: in expansion of macro '__cpu_to_le32'
   88 | #define cpu_to_le32 __cpu_to_le32
      |                     ^~~~~~~~~~~~~
drivers/net/usb/cdc_ncm.c:1175:19: note: in expansion of macro 'cpu_to_le32'
 1175 |  ndp32->wLength = cpu_to_le32(sizeof(struct usb_cdc_ncm_ndp32) + sizeof(struct usb_cdc_ncm_dpe32));
      |                   ^~~~~~~~~~~

Introduced by commit

  0fa81b304a79 ("cdc_ncm: Implement the 32-bit version of NCM Transfer Block")

-- 
Cheers,
Stephen Rothwell