linux-kernel - Re: include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar

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Message-ID: <20260111185139.GI3634291@ZenIV>
Date: Sun, 11 Jan 2026 18:51:39 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Eric Dumazet <edumazet@...gle.com>, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
	Maciej Żenczykowski <maze@...gle.com>,
	Will Deacon <will@...nel.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar

On Sun, Jan 11, 2026 at 06:20:10PM +0000, Al Viro wrote:

> Guys, do you have any problems with replacing __unqual_scalar_typeof()
> uses with that thing?
> 
> As in,#ifndef __smp_load_acquire
> #define __smp_load_acquire(p)                                           \
> ({                                                                      \
>         unqual_non_array(__typeof__(*p)) ___p1 = READ_ONCE(*p);         \
> ...
> 
> Objections?  IMO it's more palatable than current __unqual_scalar_typeof()...

Argh...  gcc prior to 8.4 fucks it up, and our minimum is 8.1 ;-/
Pity, that...  I still think it's worth keeping in mind for when
we bump the minimal gcc revision, though.

FWIW, with clang it works all way back at least to 3.1; icc - at least
to 13.0.1...