+ lots of people and linux-toolchains
On Wed, Nov 04, 2020 at 07:31:42PM +0100, Uros Bizjak wrote: > Hello! > > I was looking at the recent linux patch series [1] where segment > qualifiers (named address spaces) were introduced to handle percpu > variables. In the patch [2], the author mentions that: > > --q-- > Unfortunately, gcc does not provide a way to remove segment > qualifiers, which is needed to use typeof() to create local instances > of the per-cpu variable. For this reason, do not use the segment > qualifier for per-cpu variables, and do casting using the segment > qualifier instead. > --/q-- C in general does not provide means to strip qualifiers. We recently had a _lot_ of 'fun' trying to strip volatile from a type, see here: https://lore.kernel.org/lkml/875zimp0ay....@mpe.ellerman.id.au which resulted in the current __unqual_scalar_typeof() hack. If we're going to do compiler extentions here, can we pretty please have a sane means of modifying qualifiers in general?
