On Tue, May 20, 2014 at 04:47:12PM +0200, Andreas Herrmann wrote:
> +
> +union pci_config_address {
> + struct {
> +#ifdef __LITTLE_ENDIAN
> + unsigned register_number : 8; /* 7 .. 0 */
> + unsigned devfn_number : 8; /* 15 .. 8 */
> + unsigned bus_number : 8; /* 23 .. 16 */
> + unsigned reserved : 7; /* 30 .. 24 */
> + unsigned enable_bit : 1; /* 31 */
> +#else
> + unsigned enable_bit : 1; /* 31 */
> + unsigned reserved : 7; /* 30 .. 24 */
> + unsigned bus_number : 8; /* 23 .. 16 */
> + unsigned devfn_number : 8; /* 15 .. 8 */
> + unsigned register_number : 8; /* 7 .. 0 */
> +#endif
For this kind of endianess dependency there is a more elegant way of
defining things in linux-next's <uapi/asm/bitfield.h> like:
#include <uapi/asm/bitfield.h>
...
struct {
__BITFIELD_FIELD(unsigned enable_bit : 1, /* 31
*/
__BITFIELD_FIELD(unsigned reserved : 7, /* 30
.. 24 */
__BITFIELD_FIELD(unsigned bus_number : 8, /* 23
.. 16 */
__BITFIELD_FIELD(unsigned devfn_number : 8, /* 15
.. 8 */
__BITFIELD_FIELD(unsigned register_number : 8, /* 7
.. 0 */
)))));
};
No ifdef, no duplication!
Ralf
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