linux-kernel - Re: [PATCH 1/1] Bluetooth: make hci_test

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Message-ID: <54E5F0A4.9080300@suse.cz>
Date:	Thu, 19 Feb 2015 15:18:12 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	johan.hedberg@...il.com
CC:	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo@...ovan.org>
Subject: Re: [PATCH 1/1] Bluetooth: make hci_test_bit's addr const

On 02/19/2015, 02:56 PM, Jiri Slaby wrote:
> gcc5 warns about passing a const array to hci_test_bit which takes a
> non-const pointer:
> 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)
>                    ^
> 
> So make 'addr' 'const void *'.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Marcel Holtmann <marcel@...tmann.org>
> Cc: Gustavo Padovan <gustavo@...ovan.org>
> Cc: Johan Hedberg <johan.hedberg@...il.com>
> ---
>  net/bluetooth/hci_sock.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
> index 1d65c5be7c82..34a095ff8679 100644
> --- a/net/bluetooth/hci_sock.c
> +++ b/net/bluetooth/hci_sock.c
> @@ -46,7 +46,7 @@ struct hci_pinfo {
>  	unsigned short    channel;
>  };
>  
> -static inline int hci_test_bit(int nr, void *addr)
> +static inline int hci_test_bit(int nr, const void *addr)
>  {
>  	return *((__u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));

quite interestingly, the compiler doesn't complain against the cast...
Will send a v2.

-- 
js
suse labs
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