On Fri, 2020-01-31 at 11:34:54 UTC, Christophe Leroy wrote:

Since commit b86fb88855ea ("powerpc/32: implement fast entry for
syscalls on non BOOKE") and commit 1a4b739bbb4f ("powerpc/32:
implement fast entry for syscalls on BOOKE"), syscalls from
kernel are unexpected and can have catastrophic consequences
as it will destroy the kernel stack.

Test MSR_PR on syscall entry. In case syscall is from kernel,
emit a warning and return ENOSYS error.

Signed-off-by: Christophe Leroy <redacted>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/9e27086292aa880921a0f2b8501e5189d5efcf03

cheers