Thread (2 messages) flat view 2 messages, 2 authors, 2021-11-16

Re: [PATCH bpf-next v6] bpf: Change value of MAX_TAIL_CALL_CNT from 32 to 33

From: patchwork-bot+netdevbpf@kernel.org
Date: 2021-11-16 13:40:21
Also in: bpf, lkml

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann [off-list ref]:

On Fri,  5 Nov 2021 09:30:00 +0800 you wrote:
In the current code, the actual max tail call count is 33 which is greater
than MAX_TAIL_CALL_CNT (defined as 32), the actual limit is not consistent
with the meaning of MAX_TAIL_CALL_CNT, there is some confusion and need to
spend some time to think about the reason at the first glance.

We can see the historical evolution from commit 04fd61ab36ec ("bpf: allow
bpf programs to tail-call other bpf programs") and commit f9dabe016b63
("bpf: Undo off-by-one in interpreter tail call count limit").

[...]
Here is the summary with links:
  - [bpf-next,v6] bpf: Change value of MAX_TAIL_CALL_CNT from 32 to 33
    https://git.kernel.org/bpf/bpf-next/c/ebf7f6f0a6cd

You are awesome, thank you!
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