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bpf: devmap, use cond_resched instead of cpu_relax

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Be a bit more friendly about waiting for flush bits to complete.
Replace the cpu_relax() with a cond_resched().

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend
2017-09-08 14:01:10 -07:00
committed by David S. Miller
parent 5a67da2a71
commit 374fb014fc
1 changed files with 1 additions and 1 deletions
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kernel/bpf/devmap.c
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@@ -159,7 +159,7 @@ static void dev_map_free(struct bpf_map *map)
unsigned long *bitmap = per_cpu_ptr(dtab->flush_needed, cpu); unsigned long *bitmap = per_cpu_ptr(dtab->flush_needed, cpu);
while (!bitmap_empty(bitmap, dtab->map.max_entries)) while (!bitmap_empty(bitmap, dtab->map.max_entries))
cpu_relax(); cond_resched();
} }
for (i = 0; i < dtab->map.max_entries; i++) { for (i = 0; i < dtab->map.max_entries; i++) {