linux-kernel - Re: [PATCH v3 0/6] mips: system call table generation support

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Message-ID: <alpine.LFD.2.21.1812062141300.22112@eddie.linux-mips.org>
Date:   Fri, 7 Dec 2018 14:33:17 +0000 (GMT)
From:   "Maciej W. Rozycki" <macro@...ux-mips.org>
To:     Florian Weimer <fweimer@...hat.com>
cc:     Joseph Myers <joseph@...esourcery.com>,
        Paul Burton <paul.burton@...s.com>,
        Firoz Khan <firoz.khan@...aro.org>,
        "open list:RALINK MIPS ARCHITECTURE" <linux-mips@...ux-mips.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Marcin Juszkiewicz <marcin.juszkiewicz@...aro.org>,
        libc-alpha@...rceware.org
Subject: Re: [PATCH v3 0/6] mips: system call table generation support

On Thu, 6 Dec 2018, Florian Weimer wrote:

> >  I seem to remember having to take extra care with how the three MIPS ABIs 
> > wire the syscalls to get it right in glibc, but I take it then this has 
> > been now addressed reliably enough for the glibc not to care how exactly
> > <asm/unistd.h> has been arranged.
> 
> This is a fairly recent change (commit
> 2dba5ce7b8115d6a2789bf279892263621088e74, "<bits/syscall.h>: Use an
> arch-independent system call list on Linux", first release with it is
> glibc 2.27).  This patch is quite backportable; we have put it into our
> 2.17-derived glibc, and the upstream work was originally driven by
> downstream ordering requirements of kernel header and glibc builds.
> Glad to see it's useful elsewhere.

 Thanks for the pointer, and the work you have done to make this more 
robust; it was that that I missed.

> The test retains the old <asm/unistd.h>-based macro extraction for
> testing purposes, but it needs that only for the actual target
> architecture and only the *names*, so it's easy to implement.  Before
> that, the generation would have to carefully take into account multiple
> sub-targets (i386/x86-64/x32 is one of the more complicated scenarios).
> Presumably, you saw problem with that part.

 Yeah, the MIPS o32/n64/n32 ABI set is a corresponding situation, except 
that somewhat longer-lived as we've had support for these three ABIs since 
2001, including the ability to concurrently run user executables built for 
any of these ABIs under a single 64-bit Linux kernel.

  Maciej