On 2014-10-20 09:57, Sujith Manoharan wrote:
> Felix Fietkau wrote:
>> diff --git a/drivers/net/wireless/ath/ath9k/hw.h
>> b/drivers/net/wireless/ath/ath9k/hw.h
>> index 975074f..7a81f5b 100644
>> --- a/drivers/net/wireless/ath/ath9k/hw.h
>> +++ b/drivers/net/wireless/ath/ath9k/hw.h
>> @@ -244,13 +244,20 @@ enum ath9k_hw_caps {
>> ATH9K_HW_CAP_2GHZ = BIT(11),
>> ATH9K_HW_CAP_5GHZ = BIT(12),
>> ATH9K_HW_CAP_APM = BIT(13),
>> +#ifdef CONFIG_ATH9K_PCOEM
>> ATH9K_HW_CAP_RTT = BIT(14),
>> ATH9K_HW_CAP_MCI = BIT(15),
>> - ATH9K_HW_CAP_DFS = BIT(16),
>> - ATH9K_HW_WOW_DEVICE_CAPABLE = BIT(17),
>> - ATH9K_HW_CAP_PAPRD = BIT(18),
>> - ATH9K_HW_CAP_FCC_BAND_SWITCH = BIT(19),
>> - ATH9K_HW_CAP_BT_ANT_DIV = BIT(20),
>> + ATH9K_HW_WOW_DEVICE_CAPABLE = BIT(16),
>> + ATH9K_HW_CAP_BT_ANT_DIV = BIT(17),
>> +#else
>> + ATH9K_HW_CAP_RTT = 0,
>> + ATH9K_HW_CAP_MCI = 0,
>> + ATH9K_HW_WOW_DEVICE_CAPABLE = 0,
>> + ATH9K_HW_CAP_BT_ANT_DIV = 0,
>> +#endif
>> + ATH9K_HW_CAP_DFS = BIT(18),
>> + ATH9K_HW_CAP_PAPRD = BIT(19),
>> + ATH9K_HW_CAP_FCC_BAND_SWITCH = BIT(20),
>> };
>
> Why is this needed ?
To allow the compiler to optimize out code checking for these features.
That way we don't have to #ifdef all those places where this gets used.
- Felix
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