...
> >> - if (!csum_trailer->valid) {
> >> + if (!u8_get_bits(csum_trailer->flags, MAP_CSUM_DL_VALID_FMASK)) {
> >
> > Is that just an overcomplicated way of saying:
> > if (!(csum_trailer->flags & MAP_CSUM_DL_VALID_FMASK)) {
>
> Yes it is. I defined and used all the field masks in a
> consistent way, but I do think it will read better the
> way you suggest. Bjorn also asked me privately whether
> GENMASK(15, 15) was just the same as BIT(15) (it is).
>
> I will post version 3 of the series, identifying which
> fields are single bit/Boolean. For those I will define
> the value using BIT() and will set/extract using simple
> AND/OR operators. I won't use the _FMASK suffix on such
> fields.
Even for the checksum offset a simple 'offset << CONSTANT'
is enough.
If it is the bottom bits then even that isn't really needed.
You might want to mask off high bits - but that is an error
path that needs to have been checked earlier.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT,
UK
Registration No: 1397386 (Wales)
