linux-kernel - Re: [PATCH v7 0/5] parisc: system call table generation support

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Message-ID: <CALxhOnjgnn-5LYndwZDJU=_C_RKOCWw6+qyrASedL0XM7GhLMQ@mail.gmail.com>
Date:   Mon, 19 Nov 2018 10:51:00 +0530
From:   Firoz Khan <firoz.khan@...aro.org>
To:     Helge Deller <deller@....de>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-parisc@...r.kernel.org,
        James.Bottomley@...senpartnership.com, dave.anglin@...l.net,
        "James E . J . Bottomley" <jejb@...isc-linux.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        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>
Subject: Re: [PATCH v7 0/5] parisc: system call table generation support

Hi Helge,

On Sat, 17 Nov 2018 at 22:01, Helge Deller <deller@....de> wrote:
>
> * Arnd Bergmann <arnd@...db.de>:
> > On Fri, Nov 16, 2018 at 1:55 PM Helge Deller <deller@....de> wrote:
> > > > On Fri, 16 Nov 2018 at 01:01, Helge Deller <deller@....de> wrote:
> > > > >
> > > > > On 14.11.2018 07:34, Firoz Khan wrote:
> > > > > > The purpose of this patch series is, we can easily
> > > > > > add/modify/delete system call table support by cha-
> > > > > > nging entry in syscall.tbl file instead of manually
> > > > > > changing many files. The other goal is to unify the
> > > > > > system call table generation support implementation
> > > > > > across all the architectures.
> > > > > >
> > > > > > The system call tables are in different format in
> > > > > > all architecture. It will be difficult to manually
> > > > > > add, modify or delete the system calls in the resp-
> > > > > > ective files manually. To make it easy by keeping a
> > > > > > script and which'll generate uapi header file and
> > > > > > syscall table file.
> > > > > >
> > > > > > syscall.tbl contains the list of available system
> > > > > > calls along with system call number and correspond-
> > > > > > ing entry point. Add a new system call in this arch-
> > > > > > itecture will be possible by adding new entry in the
> > > > > > syscall.tbl file.
> > > > > >
> > > > > > Adding a new table entry consisting of:
> > > > > >         - System call number.
> > > > > >         - ABI.
> > > > > >         - System call name.
> > > > > >         - Entry point name.
> > > > > >
> > > > > > ....
> > > > > > Firoz Khan (5):
> > > > > >   parisc: move __IGNORE* entries to non uapi header
> > > > > >   parisc: add __NR_syscalls along with __NR_Linux_syscalls
> > > > > >   parisc: add system call table generation support
> > > > > >   parisc: generate uapi header and system call table files
> > > > > >   parisc: syscalls: ignore nfsservctl for other architectures
> > > > >
> > > > > Firoz, you may add
> > > > > Acked-by: Helge Deller <deller@....de>
> > > > > to the whole parisc series.
> > > >
> > > > Sure, will do.
> > > > I'm on a vacation right now. will send mid next week.
> > >
> > > That's ok, there is no urgency.
> > >
> > > Actually, I noticed that the generated files unistd_32.h
> > > and unistd_64.h do have the same contents, since on parisc
> > > we keep the syscall numbers the same for 32- and 64-bit.
> > > With that in mind, we can simply generate on unistd.h
> > > file for both variants.
> >
> > It depends on what we want to do in the future. When we add
> > around 20 new system calls fro y2038, my plan was to
> > only add them for 32-bit architectures, leaving holes on
> > 64-bit ones.
>
> Ok, I didn't thought of that.
>
> > We can also assign the new numbers on parisc64 but they would have the
> > same entry point as existing calls.
>
> > If you prefer doing it like that, your patch seems fine for that,
> > it's just slightly inconsistent with the other 64-bit architectures
> > then.
>
> I really prefer to stay in sync with other major architectures.
> So, please drop my last patch.
>
> Instead please apply only the next one, which drops the NR_Linux
> offset value (which is 0 anyway).

This can be easily done. FYI, our intention is the generated file must be
same as the old one. That's why I kept the offset as it is. I can add
one extra patch to remove NR_Linux.

>
> Thanks,
> Helge
>
>
> diff --git a/arch/parisc/include/uapi/asm/unistd.h b/arch/parisc/include/uapi/asm/unistd.h
> index 6e31f58ad6b5..98dc953656af 100644
> --- a/arch/parisc/include/uapi/asm/unistd.h
> +++ b/arch/parisc/include/uapi/asm/unistd.h
> @@ -2,7 +2,6 @@
>  #ifndef _UAPI_ASM_PARISC_UNISTD_H_
>  #define _UAPI_ASM_PARISC_UNISTD_H_
>
> -#define __NR_Linux             0
>  #ifdef __LP64__
>  #include <asm/unistd_64.h>
>  #else
> diff --git a/arch/parisc/kernel/syscalls/Makefile b/arch/parisc/kernel/syscalls/Makefile
> index defa8878f6d2..4dcc5c9ae7f2 100644
> --- a/arch/parisc/kernel/syscalls/Makefile
> +++ b/arch/parisc/kernel/syscalls/Makefile
> @@ -12,22 +12,18 @@ systbl := $(srctree)/$(src)/syscalltbl.sh
>  quiet_cmd_syshdr = SYSHDR  $@
>        cmd_syshdr = $(CONFIG_SHELL) '$(syshdr)' '$<' '$@'       \
>                    '$(syshdr_abis_$(basetarget))'               \
> -                  '$(syshdr_pfx_$(basetarget))'                \
> -                  '$(syshdr_offset_$(basetarget))'
> +                  '$(syshdr_pfx_$(basetarget))'
>
>  quiet_cmd_systbl = SYSTBL  $@
>        cmd_systbl = $(CONFIG_SHELL) '$(systbl)' '$<' '$@'       \
>                    '$(systbl_abis_$(basetarget))'               \
> -                  '$(systbl_abi_$(basetarget))'                \
> -                  '$(systbl_offset_$(basetarget))'
> +                  '$(systbl_abi_$(basetarget))'
>
>  syshdr_abis_unistd_32 := common,32
> -syshdr_offset_unistd_32 := __NR_Linux

I'll remove this line

>  $(uapi)/unistd_32.h: $(syscall) $(syshdr)
>         $(call if_changed,syshdr)
>
>  syshdr_abis_unistd_64 := common,64
> -syshdr_offset_unistd_64 := __NR_Linux

And this one too. rest of the files will be the same w.r.t v7.

Thanks
Firoz

>  $(uapi)/unistd_64.h: $(syscall) $(syshdr)
>         $(call if_changed,syshdr)
>