linux-kernel - RE: [PATCH v6 06/15] tools/nolibc: __sysret: support syscalls who return a pointer

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Date:   Mon, 7 Aug 2023 08:16:02 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Zhangjin Wu' <falcon@...ylab.org>, "w@....eu" <w@....eu>
CC:     "arnd@...db.de" <arnd@...db.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "thomas@...ch.de" <thomas@...ch.de>
Subject: RE: [PATCH v6 06/15] tools/nolibc: __sysret: support syscalls who
 return a pointer

From: Zhangjin Wu
> Sent: 06 August 2023 13:34
...
> Based on your macro version, I tried to use the is_signed_type() from kernel,
> it seems works.

You'll find that (void *)0 isn't 'constant enough' for
is_constexpr() - so is_constexpr((type)0) can be used
to detect pointer types.
Probably requires an 'is_pointer_type()' define.
This also rather means that is_signed_type() needs to be
wrapped in is_constexpr() - probably generating header
file inclusion hell.

I'm going to add a comment on v3 of the patch...

	David

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