linux-kernel - Re: [PATCH v3 5/6] parisc: wire up rseq system call

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Date:   Mon, 8 Oct 2018 08:06:26 +0200
From:   Helge Deller <deller@....de>
To:     Firoz Khan <firoz.khan@...aro.org>
Cc:     linux-parisc@...r.kernel.org,
        "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>,
        Arnd Bergmann <arnd@...db.de>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Marcin Juszkiewicz <marcin.juszkiewicz@...aro.org>
Subject: Re: [PATCH v3 5/6] parisc: wire up rseq system call

On 08.10.2018 07:52, Firoz Khan wrote:
> Hi Helge,
> 
> On Mon, 8 Oct 2018 at 11:11, Helge Deller <deller@....de> wrote:
>>
>> On 08.10.2018 07:16, Firoz Khan wrote:
>>> Signed-off-by: Firoz Khan <firoz.khan@...aro.org>
>>> ---
>>>  arch/parisc/kernel/syscalls/syscall.tbl | 3 ++-
>>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
>>> index 4e85293..4334bb7 100644
>>> --- a/arch/parisc/kernel/syscalls/syscall.tbl
>>> +++ b/arch/parisc/kernel/syscalls/syscall.tbl
>>> @@ -349,4 +349,5 @@
>>>  347     common  preadv2                         sys_preadv2                     compat_sys_preadv2
>>>  348     common  pwritev2                        sys_pwritev2                    compat_sys_pwritev2
>>>  349     common  statx                           sys_statx
>>> -350  common  io_pgetevents                   sys_io_pgetevents               compat_sys_io_pgetevents
>>> \ No newline at end of file
>>> +350  common  io_pgetevents                   sys_io_pgetevents               compat_sys_io_pgetevents
>>> +351  common  rseq                            sys_rseq                        compat_sys_rseq
>>
>> You can't add the rseq syscall for parisc yet.
>> It needs additional code in the kernel for parisc which hasn't been tested yet.
>> See my initial untested patch at https://patchwork.kernel.org/patch/10495209/
> 
> Thanks for your update!
> 
> When I compiled the kernel I got below warnings.
> 
> <stdin>:696:2: warning: #warning syscall nfsservctl not implemented [-Wcpp]
> <stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp]
> 
> I added an IGNORE entry nfsservctl in script/checksyscalls.sh because this
> syscall is gone. But we definitely have to keep rseq entry on parisc
> architecture.

I prefer to keep the warning for rseq for now.
It reminds me that we still may want the rseq syscall.
If the warning is a problem, you may simply add the __IGNORE_rseq define. 

> I can ignore this patch currently as your patch not yet tested.
> 
> FYI, I have merged the system call table files based on our previous
> discussions.
> Please comment on that.

I'll do after testing.

Thanks!
Helge
 
> I would appreciate if you can perform a boot test without this patch
> on the actual
> platform.
> 
> Firoz
> 
>>
>> Helge