linux-kernel - Re: [RFC PATCH v2 3/8] tools/nolibc: i386: Implement syscall with 6 arguments

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Date:   Tue, 22 Mar 2022 21:47:56 +0700
From:   Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
To:     David Laight <David.Laight@...lab.com>
Cc:     Willy Tarreau <w@....eu>, Ammar Faizi <ammarfaizi2@...weeb.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Nugraha <richiisei@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "GNU/Weeb Mailing List" <gwml@...r.gnuweeb.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>
Subject: Re: [RFC PATCH v2 3/8] tools/nolibc: i386: Implement syscall with 6 arguments

On Tue, Mar 22, 2022 at 8:37 PM David Laight wrote:
> dunno, 'asm' register variables are rather more horrid and
> should probably only be used (for asm statements) when there aren't
> suitable register constraints.
>
> (I'm sure there is a comment about that in the gcc docs.)

I don't find the comment that says so here:
https://gcc.gnu.org/onlinedocs/gcc/Local-Register-Variables.html

The current code looks valid to me, but I would still prefer to use
the explicit register constraints instead of always using "r"(var) if
available. No strong reason in denying that, tho. Still looks good.

-- Viro