bpf: Don't use tasklet in stackmap code when RT.
In the RT kernel we can't use up_read_non_owner().
So in such a configuration, simply elide the annotated stackmap and
just report the raw IPs.
In the longer term, we can make atomic friendly versions of the page
cache traversal which will at least provide the info if the pages are
resident and don't need to be paged in.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191207.160457.297470232945357742.davem@davemloft.net
1 file changed
