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

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Message-ID: <alpine.DEB.2.21.1812061719180.12167@digraph.polyomino.org.uk>
Date:   Thu, 6 Dec 2018 17:20:37 +0000
From:   Joseph Myers <joseph@...esourcery.com>
To:     "Maciej W. Rozycki" <macro@...ux-mips.org>
CC:     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, Maciej W. Rozycki wrote:

> On Thu, 6 Dec 2018, Joseph Myers wrote:
> 
> > >  I believe this file is used by the glibc build process to retrieve 
> > > syscall numbers for glibc's own use as well for <sys/syscall.h>.  Has the 
> > > change been verified not to break this process?
> > > 
> > >  Cc-ing <libc-alpha@...rceware.org> for information and possible further 
> > > input.
> > 
> > I'm not sure what "this file" is.  The glibc build uses the installed 
> > <asm/unistd.h> (the results of #including it, not any other kind of 
> > processing the file).
> 
>  So how are `SYS_<name>' macros generated that land in <bits/syscall.h>?

By gen-syscall-h.awk, which generates #ifdef conditionals for each 
possible __NR_* name (as listed in syscall-names.list in glibc).

-- 
Joseph S. Myers
joseph@...esourcery.com