linux-kernel - Re: [v6,1/5] powerpc: add __NR_syscalls along with NR

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Date:   Mon, 24 Dec 2018 10:48:50 +0530
From:   Firoz Khan <firoz.khan@...aro.org>
To:     Michael Ellerman <patch-notifications@...erman.id.au>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Ram Pai <linuxram@...ibm.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Breno Leitao <leitao@...ian.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marcin Juszkiewicz <marcin.juszkiewicz@...aro.org>,
        Deepa Dinamani <deepa.kernel@...il.com>
Subject: Re: [v6,1/5] powerpc: add __NR_syscalls along with NR_syscalls

On Sun, 23 Dec 2018 at 18:58, Michael Ellerman
<patch-notifications@...erman.id.au> wrote:
>
> On Mon, 2018-12-17 at 10:40:32 UTC, Firoz Khan wrote:
> > NR_syscalls macro holds the number of system call exist
> > in powerpc architecture. We have to change the value of
> > NR_syscalls, if we add or delete a system call.
> >
> > One of the patch in this patch series has a script which
> > will generate a uapi header based on syscall.tbl file.
> > The syscall.tbl file contains the number of system call
> > information. So we have two option to update NR_syscalls
> > value.
> >
> > 1. Update NR_syscalls in asm/unistd.h manually by count-
> >    ing the no.of system calls. No need to update NR_sys-
> >    calls until we either add a new system call or delete
> >    existing system call.
> >
> > 2. We can keep this feature in above mentioned script,
> >    that will count the number of syscalls and keep it in
> >    a generated file. In this case we don't need to expli-
> >    citly update NR_syscalls in asm/unistd.h file.
> >
> > The 2nd option will be the recommended one. For that, I
> > added the __NR_syscalls macro in uapi/asm/unistd.h along
> > with NR_syscalls asm/unistd.h. The macro __NR_syscalls
> > also added for making the name convention same across all
> > architecture. While __NR_syscalls isn't strictly part of
> > the uapi, having it as part of the generated header to
> > simplifies the implementation. We also need to enclose
> > this macro with #ifdef __KERNEL__ to avoid side effects.
> >
> > Signed-off-by: Firoz Khan <firoz.khan@...aro.org>
>
> Series applied to powerpc next, thanks.

Thanks Micheal!

Firoz

>
> https://git.kernel.org/powerpc/c/8a19eeeab66dfdd7c67bc8e3048ac0
>
> cheers