linux-kernel - Re: [PATCH] fix __percpu annotation in asm-generic

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Message-ID: <20200324064452.zsnpcvihgeyegtmu@ltop.local>
Date:   Tue, 24 Mar 2020 07:44:52 +0100
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Christopher Lameter <cl@...ux.com>,
        Dennis Zhou <dennis@...nel.org>,
        Ben Dooks <ben.dooks@...ethink.co.uk>,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tejun Heo <tj@...nel.org>, Nicholas Piggin <npiggin@...il.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] fix __percpu annotation in asm-generic

On Mon, Mar 23, 2020 at 10:13:47PM -0600, Jason A. Donenfeld wrote:
> On Sat, Nov 30, 2019 at 01:00:37AM +0100, Luc Van Oostenryck wrote:
> > Note: it would be much much nicer to do all these type generic
> >       macros with '__auto_type' (only supported in GCC 4.9 IIUC
> >       and supported in sparse but it shouldn't be very hard to do)..
> 
> I'm curious to know if you know why we're not using __auto_type. Because
> we're stuck on gcc 4.6, or is there a more subtle reason?

I suppose. I don't remember having ever seen a discussion on the
subject (other than a simple remark like "it would be simpler
with __auto_type").

Mainline Sparse doesn't support it but I've a pending series for it
that seems to work well. 

-- Luc