[SLOF] [PATCH slof] pci-phb: Reimplement dma-map-in/out
segher at kernel.crashing.org
Wed Nov 20 12:05:07 AEDT 2019
On Wed, Nov 20, 2019 at 11:25:20AM +1100, Alexey Kardashevskiy wrote:
> On 20/11/2019 05:10, Segher Boessenkool wrote:
> > On Fri, Nov 15, 2019 at 10:33:58AM +1100, Alexey Kardashevskiy wrote:
> >> I am really not used to "-1000" :-/
> > -N reads a bit nicer than ~(N-1), but it is the same thing. I find it
> > easier to read -1000 and instead of fff invert and but that is for
> > a big part just what you are used to.
> Well, I did not see this being used anywhere else, like, in linux.
It is used a lot in binutils and in GCC, at least.
Linux doesn't use it much, indeed. It uses the "x & -x" idiom to isolate
the lowest set bit quite a bit, but the "& -align" idiom not often; mostly
a bit in fs/ and in random drivers.
More information about the SLOF