trace: reenable preemption if we modify the ip

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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: 9802d86585 ("bpf: add a bpf_override_function helper")
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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Josef Bacik 2017-12-15 21:42:57 -05:00 • committed by Daniel Borkmann

parent 4a29c0db69

commit 46df3d209d

1 changed files with 8 additions and 1 deletions

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kernel/trace/trace_kprobe.c

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