On 24 November 2018 18:16:47 EET, Andrew Lunn <and...@lunn.ch> wrote: >On Sat, Nov 24, 2018 at 04:34:22AM +0200, Nikolay Aleksandrov wrote: >> Now that we have at least one bool option, we can export all of the >> supported bool options via optmask when dumping them. >> >Hi Nik > >That answers my question then... > >I'm assuming this means there is no easy way to generate a bitmask of >0? So you waited until there was at least one bit. > >(1 << 2) - 1 = 3 >(1 << 1) - 1 = 1 >(1 << 0) - 1 = 0 > >So does > >GENMASK((BR_BOOLOPT_MAX - 1), 0); > >really not do the right thing when BR_BOOLOPT_MAX = 1? >
GENMASK(0, 0) = 1 the minus is done before the shift. Think of it of setting all bits from 0 to MAX - 1 inclusive. > Andrew -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
