On Wed, Feb 28, 2024 at 05:39:21PM -0600, Lucas De Marchi wrote: > On Thu, Feb 22, 2024 at 06:49:59AM -0800, Yury Norov wrote: > > On Wed, Feb 21, 2024 at 03:59:06PM -0600, Lucas De Marchi wrote: > > > On Wed, Feb 21, 2024 at 11:04:22PM +0200, Andy Shevchenko wrote: > > > > On Wed, Feb 21, 2024 at 10:30:02PM +0200, Dmitry Baryshkov wrote: > > > > > On Thu, 8 Feb 2024 at 09:45, Lucas De Marchi <lucas.demarchi@xxxxxxxxx> wrote: ... > I build-tested this in x86-64, x86-32 and arm64. I didn't like much the > need to fork the __GENMASK() implementation on the 2 sides of the ifdef > since I think the GENMASK_INPUT_CHECK() should be the one covering the > input checks. However to make it common we'd need to solve 2 problems: > the casts and the sizeof. The sizeof can be passed as arg to > __GENMASK(), however the casts I think would need a __CAST_U8(x) > or the like and sprinkle it everywhere, which would hurt readability. > Not pretty. Or go back to the original submission and make it less > horrible :-/ I'm wondering if we can use _Generic() approach here. ... > > #define GENMASK_INPUT_CHECK(h, l) 0 > > +#define __GENMASK(t, h, l) \ > > + ((~0 - (1 << (l)) + 1) & (~0 >> (BITS_PER_LONG - 1 - (h)))) > > humn... this builds, but does it work if GENMASK_ULL() is used in > assembly? That BITS_PER_LONG does not match the type width. UL()/ULL() macros are not just for fun. -- With Best Regards, Andy Shevchenko
