- On Jun 5, 2018, at 1:21 AM, Michael Ellerman m...@ellerman.id.au wrote:
> Mathieu Desnoyers writes:
>> From: Boqun Feng
>>
>> Syscalls are not allowed inside restartable sequences, so add a call to
>> rseq_syscall() at the very beginning of system call exiting path for
>> CONFIG_DEBUG_RSEQ=y kernel. This could help us to detect whether there
>> is a syscall issued inside restartable sequences.
>>
>> [ Tested on 64-bit powerpc kernel by Mathieu Desnoyers. Still needs to
>> be tested on 32-bit powerpc kernel. ]
>>
>> Signed-off-by: Boqun Feng
>> Signed-off-by: Mathieu Desnoyers
>> CC: Benjamin Herrenschmidt
>> CC: Paul Mackerras
>> CC: Michael Ellerman
>> CC: Peter Zijlstra
>> CC: "Paul E. McKenney"
>> CC: linuxppc-dev@lists.ozlabs.org
>> ---
>> arch/powerpc/kernel/entry_32.S | 7 +++
>> arch/powerpc/kernel/entry_64.S | 8
>> 2 files changed, 15 insertions(+)
>
> I don't _love_ the #ifdefs in here, but they look correct and there's
> not really a better option until we rewrite the syscall handler in C.
>
> The rseq selftests passed for me with this applied and enabled. So if
> you like here's some tags:
>
> Tested-by: Michael Ellerman
> Acked-by: Michael Ellerman
>
Adding you ack to the series.
Thanks!
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
