bpf: avoid warning for wrong pointer cast
authorArnd Bergmann <arnd@arndb.de>
Sat, 16 Apr 2016 20:29:33 +0000 (22:29 +0200)
committerDavid S. Miller <davem@davemloft.net>
Tue, 19 Apr 2016 00:58:55 +0000 (20:58 -0400)
commit266a0a790fb545fa1802a899ac44f61b1d6335a7
tree903b92e6f266ed94bf52efa7ca04d7c8809854cc
parentb520bd07595b117a08871ebc0a16452cc798d35b
bpf: avoid warning for wrong pointer cast

Two new functions in bpf contain a cast from a 'u64' to a
pointer. This works on 64-bit architectures but causes a warning
on all 32-bit architectures:

kernel/trace/bpf_trace.c: In function 'bpf_perf_event_output_tp':
kernel/trace/bpf_trace.c:350:13: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
  u64 ctx = *(long *)r1;

This changes the cast to first convert the u64 argument into a uintptr_t,
which is guaranteed to be the same size as a pointer.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 9940d67c93b5 ("bpf: support bpf_get_stackid() and bpf_perf_event_output() in tracepoint programs")
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
kernel/trace/bpf_trace.c