Re: [PATCH 2/5] seqlock: Fold seqcount_LOCKNAME_t definition

[Matthew Wilcox]

On Wed, Jul 29, 2020 at 03:52:51PM +0200, Peter Zijlstra wrote:
> Manual repetition is boring and error prone.

Yes, but generated functions are hard to grep for, and I'm pretty sure
that kernel-doc doesn't know how to expand macros into comments that it
can then extract documentation from.

I've been thinking about how to cure this (mostly in the context
of page-flags.h).  I don't particularly like the C preprocessor, but
m4 is worse and defining our own preprocessing language seems like a
terrible idea.

So I was thinking about moving the current contents of page-flags.h
to include/src/page-flags.h, making linux/page-flags.h depend on
src/page-flags.h and run '$(CPP) -C' to generate it.  I've been a little
busy recently and haven't had time to do more than muse about this, but
I think it might make sense for some of our more heavily macro-templated
header files.