Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> writes: > From: Boqun Feng <boqun.feng@xxxxxxxxx> > > 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 <boqun.feng@xxxxxxxxx> > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> > CC: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> > CC: Paul Mackerras <paulus@xxxxxxxxx> > CC: Michael Ellerman <mpe@xxxxxxxxxxxxxx> > CC: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > CC: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> > CC: linuxppc-dev@xxxxxxxxxxxxxxxx > --- > 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 <mpe@xxxxxxxxxxxxxx> Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> cheers -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
