linux-kernel - Re: [PATCH 3/3] syscalls: Add a bit of documentation to __SYSCALL

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Message-ID: <20180128225031.GJ13338@ZenIV.linux.org.uk>
Date:   Sun, 28 Jan 2018 22:50:31 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 3/3] syscalls: Add a bit of documentation to
 __SYSCALL_DEFINE

On Sun, Jan 28, 2018 at 12:42:24PM -0800, Linus Torvalds wrote:

> The 64-bit argument for 32-bit case would end up having to have a few
> more of those architecture-specific oddities. So not just
> "argument1(ptregs)", but "argument2_32_64(ptregs)" or something that
> says "get me argument 2, when the first argument is 32-bit and I want
> a 64-bit one".

Yeah, but...  You either get to give SYSCALL_DEFINE more than just
the number of arguments (SYSCALL_DEFINE_WDDW) or you need to go
for rather grotty macros to pick that information.  That's pretty
much what I'd tried; it hadn't been fun at all...