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Date:	Fri, 25 Mar 2016 00:30:25 +0100
From:	Daniel Borkmann <>
	Daniel Borkmann <>
Subject: [PATCH net] bpf: add missing map_flags to bpf_map_show_fdinfo

Add map_flags attribute to bpf_map_show_fdinfo(), so that tools like
tc can check for them when loading objects from a pinned entry, e.g.
if user intent wrt allocation (BPF_F_NO_PREALLOC) is different to the
pinned object, it can bail out. Follow-up to 6c9059817432 ("bpf:
pre-allocate hash map elements"), so that tc can still support this
with v4.6.

Signed-off-by: Daniel Borkmann <>
Acked-by: Alexei Starovoitov <>
 kernel/bpf/syscall.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 2a2efe1..adc5e4b 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -137,11 +137,13 @@ static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
-		   "max_entries:\t%u\n",
+		   "max_entries:\t%u\n"
+		   "map_flags:\t%#x\n",
-		   map->max_entries);
+		   map->max_entries,
+		   map->map_flags);

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