lkml.org 
[lkml]   [2015]   [Feb]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v3] net: bluetooth: hci_sock: Use 'const u32 *' instead of 'void *' for 2nd parameter of hci_test_bit()
From
Date
On Sat, 2015-02-07 at 21:24 +0800, Chen Gang S wrote:
> hci_test_bit() does not modify 2nd parameter, so it is better to let it
> be constant, or may cause build warning. The related warning (with
> allmodconfig under xtensa):
>
> net/bluetooth/hci_sock.c: In function 'hci_sock_sendmsg':
> net/bluetooth/hci_sock.c:955:8: warning: passing argument 2 of 'hci_test_bit' discards 'const' qualifier from pointer target type [-Wdiscarded-array-qualifiers]
> &hci_sec_filter.ocf_mask[ogf])) &&
> ^
> net/bluetooth/hci_sock.c:49:19: note: expected 'void *' but argument is of type 'const __u32 (*)[4] {aka const unsigned int (*)[4]}'
> static inline int hci_test_bit(int nr, void *addr)
> ^
>
> hci_test_bit() always treats 2nd parameter is u32, and all callers also
> know about it, so 2nd parameter of hci_test_bit() need use 'const u32 *'
> instead of 'void *'.
>
> C language treats the array function parameter as a pointer, so the
> caller need not use '&' for the 2 demotion array, or it reports warning:
> 'const unsigned int (*)[4]' is different with 'const unsigned int *'.

I still think you are possibly papering over potential bugs
on big-endian 64 bit systems.

unsigned long vs u32.

How are the bits actually set?




\
 
 \ /
  Last update: 2015-02-07 21:01    [W:0.084 / U:0.264 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site