perf offcpu: Fix build failure on old kernels

Old kernels have a 'struct task_struct' which contains a "state" field
and newer kernels have "__state" instead.

While the get_task_state() in the BPF code handles that in some way, it
assumed the current kernel has the new definition and it caused a build
error on old kernels.

We should not assume anything and access them carefully.  Do not use
'task struct' directly access it instead using new and old definitions
in a row.

Fixes: edc41a1099c2d08c ("perf record: Enable off-cpu analysis with BPF")
Reported-by: Ian Rogers <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Cc: Blake Jones <[email protected]>
Cc: Hao Luo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Milian Wolff <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Song Liu <[email protected]>
Cc: [email protected]
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions