Re: [PATCH] printk, locking/atomics, kref: Introduce new %pAr and %pAk format string options for atomic_t and 'struct kref'

From: Ingo Molnar
Date: Wed Nov 16 2016 - 03:14:06 EST

* Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Tue, Nov 15, 2016 at 12:37 AM, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
> > +atomic variables such atomic_t or struct kref:
> > +
> > + %pAr atomic_t count
> > + %pAk struct kref count
> Not a huge fan. That "r" makes sense to you ("raw" atomic), but it
> makes no sense to a user. An atomic isn't "raw" to anybody else. It's
> just an atomic.

So in the latestest patch this has evolved to:

%pAa - print the 'atomic_t' count in decimal
%pAk - print the 'struct kref' count in decimal
%pAr - print the 'refcount_t' count in decimal

... are you still hating it?

> Also, we have 'atomic64_t", which this doesn't cover at all.

We could use a somewhat logical letter for atomic64_t too:

%pAA - print the 'atomic64_t' count in decimal

... as 'A' is the bigger version of 'a', just like atomic64_t is the bigger
version of atomic_t! ;-)

> I'd suggest just %pA, %pA64, %pAkref or something. Which leaves us the
> choice to add more atomic versions later without having to make up
> random one-letter things that make no sense.

It's a bit more work, but we could do that too, if you still don't like the above
single letter abbreviations.