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Message-Id: <20181217080846.GA28424@sathnaga86.in.ibm.com>
Date: Mon, 17 Dec 2018 13:38:46 +0530
From: Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>
To: Firoz Khan <firoz.khan@...aro.org>
Cc: linuxppc-dev@...ts.ozlabs.org,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
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@...r.kernel.org, y2038@...ts.linaro.org,
linux-kernel@...r.kernel.org, marcin.juszkiewicz@...aro.org,
deepa.kernel@...il.com
Subject: Re: [PATCH v5 0/5] powerpc: system call table generation support
Hi Firoz,
On Thu, Dec 13, 2018 at 02:32:45PM +0530, 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.
> - Compat entry name, if required.
> - spu entry name, if required.
>
> ARM, s390 and x86 architecuture does exist the sim-
> ilar support. I leverage their implementation to
> come up with a generic solution.
>
> I have done the same support for work for alpha,
> ia64, m68k, microblaze, mips, parisc, sh, sparc,
> and xtensa. Below mentioned git repository contains
> more details about the workflow.
>
> https://github.com/frzkhn/system_call_table_generator/
>
> Finally, this is the ground work to solve the Y2038
> issue. We need to add two dozen of system calls to
> solve Y2038 issue. So this patch series will help to
> add new system calls easily by adding new entry in the
> syscall.tbl.
>
> Changes since v4:
> - DOTSYM macro removed for ppc32, which was causing
> the compilation error.
>
> Changes since v3:
> - split compat syscall table out from native table.
> - modified the script to add new line in the generated
> file.
>
> Changes since v2:
> - modified/optimized the syscall.tbl to avoid duplicate
> for the spu entries.
> - updated the syscalltbl.sh to meet the above point.
>
> Changes since v1:
> - optimized/updated the syscall table generation
> scripts.
> - fixed all mixed indentation issues in syscall.tbl.
> - added "comments" in syscall_*.tbl.
> - changed from generic-y to generated-y in Kbuild.
>
> Firoz Khan (5):
> powerpc: add __NR_syscalls along with NR_syscalls
> powerpc: move macro definition from asm/systbl.h
> powerpc: add system call table generation support
> powerpc: split compat syscall table out from native table
> powerpc: generate uapi header and system call table files
Tried to apply on linus "master" and linuxppc-dev(https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git) "merge" branch,
both failed to apply series.
# git am mbox
Applying: powerpc: add __NR_syscalls along with NR_syscalls
Applying: powerpc: move macro definition from asm/systbl.h
Applying: powerpc: add system call table generation support
Applying: powerpc: split compat syscall table out from native table
Applying: powerpc: generate uapi header and system call table files
error: patch failed: arch/powerpc/include/uapi/asm/Kbuild:1
error: arch/powerpc/include/uapi/asm/Kbuild: patch does not apply
Patch failed at 0005 powerpc: generate uapi header and system call table files
Use 'git am --show-current-patch' to see the failed patch
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
Then, tried with linuxppc-dev(https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git) "next" branch,
patch got applied, compiled with ppc64le_defconfig and booted on IBM Power8 box.
# uname -r
4.20.0-rc2-gdd2690d2c
Looks like patch series needs a rebase against the latest kernel versions.
Thanks,
-Satheesh.
>
> arch/powerpc/Makefile | 3 +
> arch/powerpc/include/asm/Kbuild | 4 +
> arch/powerpc/include/asm/syscall.h | 3 +-
> arch/powerpc/include/asm/systbl.h | 396 --------------------------
> arch/powerpc/include/asm/unistd.h | 3 +-
> arch/powerpc/include/uapi/asm/Kbuild | 2 +
> arch/powerpc/include/uapi/asm/unistd.h | 389 +------------------------
> arch/powerpc/kernel/Makefile | 10 -
> arch/powerpc/kernel/entry_64.S | 7 +-
> arch/powerpc/kernel/syscalls/Makefile | 63 ++++
> arch/powerpc/kernel/syscalls/syscall.tbl | 427 ++++++++++++++++++++++++++++
> arch/powerpc/kernel/syscalls/syscallhdr.sh | 37 +++
> arch/powerpc/kernel/syscalls/syscalltbl.sh | 36 +++
> arch/powerpc/kernel/systbl.S | 40 ++-
> arch/powerpc/kernel/systbl_chk.c | 60 ----
> arch/powerpc/kernel/vdso.c | 7 +-
> arch/powerpc/platforms/cell/spu_callbacks.c | 17 +-
> 17 files changed, 606 insertions(+), 898 deletions(-)
> delete mode 100644 arch/powerpc/include/asm/systbl.h
> create mode 100644 arch/powerpc/kernel/syscalls/Makefile
> create mode 100644 arch/powerpc/kernel/syscalls/syscall.tbl
> create mode 100644 arch/powerpc/kernel/syscalls/syscallhdr.sh
> create mode 100644 arch/powerpc/kernel/syscalls/syscalltbl.sh
> delete mode 100644 arch/powerpc/kernel/systbl_chk.c
>
> --
> 1.9.1
>
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