linux-kernel - Re: [PATCH v2] s390: fix build error for sys_call_table

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Date:   Fri, 19 Jun 2020 16:17:17 +0200
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Xiaoming Ni <nixiaoming@...wei.com>
Cc:     acme@...nel.org, alexander.shishkin@...ux.intel.com, arnd@...db.de,
        borntraeger@...ibm.com, catalin.marinas@....com,
        christian@...uner.io, cyphar@...har.com, dhowells@...hat.com,
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        gor@...ux.ibm.com, ink@...assic.park.msu.ru, jolsa@...hat.com,
        linux@...linux.org.uk, lkp@...el.com, mark.rutland@....com,
        mattst88@...il.com, minchan@...nel.org, mingo@...hat.com,
        monstr@...str.eu, namhyung@...nel.org, peterz@...radead.org,
        rth@...ddle.net, sargun@...gun.me, sfr@...b.auug.org.au,
        tony.luck@...el.com, will@...nel.org, akpm@...ux-foundation.org,
        alex.huangjianhui@...wei.com, zhongjubin@...wei.com,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v2] s390: fix build error for sys_call_table_emu

On Thu, Jun 18, 2020 at 10:14:26PM +0800, Xiaoming Ni wrote:
> Build error on s390:
> 	arch/s390/kernel/entry.o: in function `sys_call_table_emu':
> 	>> (.rodata+0x1288): undefined reference to `__s390_'
> 
> In commit ("All arch: remove system call sys_sysctl")
>  148  common	fdatasync		sys_fdatasync			sys_fdatasync
> -149  common	_sysctl			sys_sysctl			compat_sys_sysctl
> +149  common	_sysctl			sys_ni_syscall
>  150  common	mlock			sys_mlock			sys_mlock
> 
> After the patch is integrated, there is a format error in the generated
> arch/s390/include/generated/asm/syscall_table.h:
> 	SYSCALL(sys_fdatasync, sys_fdatasync)
> 	SYSCALL(sys_ni_syscall,) /* cause build error */
> 	SYSCALL(sys_mlock,sys_mlock)
> 
> According to the guidance of Heiko Carstens, use "-" to fill the empty system call
>  Similarly, modify tools/perf/arch/s390/entry/syscalls/syscall.tbl.
> 
> Fixes: ("All arch: remove system call sys_sysctl")
> Fixes: https://lore.kernel.org/linuxppc-dev/20200616030734.87257-1-nixiaoming@huawei.com/
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Xiaoming Ni <nixiaoming@...wei.com>
> 
> changes in v2:
> 	use "-" to fill the empty system call
> 
> v1: https://lore.kernel.org/lkml/20200618110320.104013-1-nixiaoming@huawei.com/
> ---
>  arch/s390/kernel/syscalls/syscall.tbl           | 2 +-
>  tools/perf/arch/s390/entry/syscalls/syscall.tbl | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>