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Date: Mon, 9 Apr 2018 08:45:11 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: linux-kernel@vger.kernel.org, Al Viro <viro@zeniv.linux.org.uk>,
        Andi Kleen <ak@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@kernel.org>, Brian Gerst <brgerst@gmail.com>,
        Denys Vlasenko <dvlasenk@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Ingo Molnar <mingo@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>, x86@kernel.org,
        Maninder Singh <maninder1.s@samsung.com>,
        Arnd Bergmann <arnd@arndb.de>, linux-arch <linux-arch@vger.kernel.org>
Subject: Re: [PATCH 0/3] syscalls: clean up stub naming convention
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* Dominik Brodowski <linux@dominikbrodowski.net> wrote:

> On Sun, Apr 08, 2018 at 10:35:50AM +0200, Ingo Molnar wrote:
> >   - _____sys_waitid()      # ridiculous number of underscores?
> >   - __sys_waitid()         # too generic sounding?
> 
> ... and we'd need to rename internal helpers in net/
> 
> >   - __inline_sys_waitid()  # too long?
> 
> sounds acceptable, though a bit long (especially for the compat case, though
> it doesn't really matter in the case of 
> __inline_compat_sys_sched_rr_get_interval)

So as per the previous mail this is not just an inline function, but an active 
type conversion wrapper that sign-extends 32-bit ints to longs, which is important 
on some 64-bit architectures.

And that's a really non-obvious property IMO, and the name should probably reflect 
_that_ non-obvious property, not the inlining property which is really just a 
small detail.

I.e. how about:

	__se_sys_waitid()

... where 'se' stands for sign-extended, with a comment in the macro that explains 
the prefix? (The historical abbreviation for sign extension is 'sext', which I 
think wouldn't really be suitable these days.)

Thanks,

	Ingo