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Date: Tue, 13 Jan 2026 00:28:00 +0000
From: Al Viro <viro@zeniv.linux.org.uk>
To: David Laight <david.laight.linux@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Eric Dumazet <edumazet@google.com>, oe-kbuild-all@lists.linux.dev,
	linux-kernel@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>,
	Maciej =?utf-8?Q?=C5=BBenczykowski?= <maze@google.com>,
	Will Deacon <will@kernel.org>,
	"Paul E. McKenney" <paulmck@kernel.org>
Subject: Re: include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
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Sender: Al Viro <viro@ftp.linux.org.uk>

On Mon, Jan 12, 2026 at 10:39:23PM +0000, David Laight wrote:

> Using __auto_type y = (1 ? 0 : 0+x) gives a non-const 'y' even with gcc 10.

... which does not work at all for the example that has started
that thread:

typedef struct {
        uid_t val;
} kuid_t;

Arithmetics is not an option for existing uses.  , and ?: would be OK, but
they are even worse than return type - at least that got fixed in 8.4.

As for the -Wignored-qualifiers...  Sure, that's included into -Wextra, along
with many other insanities - -Wunused-parameter, for example.  Grep for
-Wextra and you'll see...