tree 05b7ab8eac84d394f4c9688a7e2ced12af525b25
parent dd066823db2ac4e22f721ec85190817b58059a54
author Tushar Dave <tushar.n.dave@oracle.com> 1536783329 +0200
committer Daniel Borkmann <daniel@iogearbox.net> 1536788848 +0200

bpf: use __GFP_COMP while allocating page

Helper bpg_msg_pull_data() can allocate multiple pages while
linearizing multiple scatterlist elements into one shared page.
However, if the shared page has size > PAGE_SIZE, using
copy_page_to_iter() causes below warning.

e.g.
[ 6367.019832] WARNING: CPU: 2 PID: 7410 at lib/iov_iter.c:825
page_copy_sane.part.8+0x0/0x8

To avoid above warning, use __GFP_COMP while allocating multiple
contiguous pages.

Fixes: 015632bb30da ("bpf: sk_msg program helper bpf_sk_msg_pull_data")
Signed-off-by: Tushar Dave <tushar.n.dave@oracle.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>