powerpc/kprobes: Fix handling of instruction emulation on probe re-entry
authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Mon, 15 May 2017 18:10:05 +0000 (23:40 +0530)
committerMichael Ellerman <mpe@ellerman.id.au>
Tue, 16 May 2017 03:11:07 +0000 (13:11 +1000)
commitd04c02f8aa96d82e4cbe783f85a820aae820e746
tree01c16da24206cc7a1ec823c59a7e2197139a7bcd
parentbbb075ddf7d58762040ca413ad82e9974713def3
powerpc/kprobes: Fix handling of instruction emulation on probe re-entry

Commit 22d8b3dec214c ("powerpc/kprobes: Emulate instructions on kprobe
handler re-entry") enabled emulating instructions on kprobe re-entry,
rather than single-stepping always. However, we didn't update the single
stepping code to only be run if the emulation fails. Also, we missed
re-enabling preemption if the instruction emulation was successful. Fix
those issues.

Fixes: 22d8b3dec214c ("powerpc/kprobes: Emulate instructions on kprobe handler re-entry")
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/kernel/kprobes.c