On Fri, Mar 20, 2020 at 3:19 PM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > The x86 CPU matching based on struct x86_cpu_id: > > - is using an inconsistent macro mess with pointlessly duplicated and > slightly different local macros. Finding the places is an art as there > is no consistent name space at all. > > - is still mostly based on C89 struct initializers which rely on the > ordering of the struct members. That's proliferated forever as every > new driver just copies the mess from some exising one. > > A recent offlist conversation about adding more match criteria to the CPU > matching logic instead of creating yet another set of horrors, reminded me > of a pile of scripts and patches which I hacked on a few years ago when I > tried to add something to struct x86_cpu_id. > > That stuff was finally not needed and ended up in my ever growing todo list > and collected dust and cobwebs, but (un)surprisingly enough most of it > still worked out of the box. The copy & paste machinery still works as it > did years ago. > > There are a few places which needed extra care due to new creative macros, > new check combinations etc. and surprisingly ONE open coded proper C99 > initializer. > > It was reasonably simple to make it at least compile and pass a quick > binary equivalence check. > > The result is a X86_MATCH prefix based set of macros which are reflecting > the needs of the usage sites and shorten the base macro which takes all > possible parameters (vendor, family, model, feature, data) and uses proper > C99 initializers. > > So extensions of the match logic are trivial after that. > Thank you, Thomas! Briefly looking to the code, I like the idea. I'll do (minor) comments on individual patches. I see it incorporates my previous attempts to extend this, but now it looks better. > The patch set is against Linus tree and has trivial conflicts against > linux-next. > > The diffstat is: > 71 files changed, 525 insertions(+), 472 deletions(-) > > but the extra lines are pretty much kernel-doc documentation which I added > to each of the new macros. The usage sites diffstat is: > > 70 files changed, 393 insertions(+), 471 deletions(-) > > Thoughts? > > Thanks, > > tglx > > -- With Best Regards, Andy Shevchenko
