tree f9a0fcd0e875ddaa5bf6317a2937d568e8417d07
parent 4a29c0db69e58b20cd7a2efce997627c6b376244
author Josef Bacik <jbacik@fb.com> 1513392177 -0500
committer Daniel Borkmann <daniel@iogearbox.net> 1513540052 +0100

trace: reenable preemption if we modify the ip

Things got moved around between the original bpf_override_return patches
and the final version, and now the ftrace kprobe dispatcher assumes if
you modified the ip that you also enabled preemption.  Make a comment of
this and enable preemption, this fixes the lockdep splat that happened
when using this feature.

Fixes: 9802d86585db ("bpf: add a bpf_override_function helper")
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>