bpf: Bump maximum runtime call stack depth to 16#11015
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The BPF verifier currently limits the maximum runtime call stack to 8 frames. Larger BPF programs like sched-ext schedulers routinely fail verification because they exceed this limit, even as they use very little actual stack space for each frame. Bump the maximum runtime call stack depth to 16 stack frames. Also adjust selftests that assume the max runtime call stack depth is 8. This patch does not change the verification time limit of 8 stack frames. Static functions that are inlined for verification purposes still only go 8 frames deep to avoid changing the verifier's internal data structures used for verification. These data structures only support holding information on up to 8 stack frames. Global functions are each verified in isolation, so the old 8 stack frame limit now only applies to call stacks composed entirely of static function calls. This patch also does not adjust the actual maximum stack size of 512. CHANGELOG ========= v1 -> v2 (https://lore.kernel.org/bpf/DG510ANGXEZH.BJ9EMMKHP5WT@etsalapatis.com) - Adjust patch to only increase the runtime stack depth, leaving the verification-time stack depth unchanged (Alexei) Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=1052899 expired. Closing PR. |
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Pull request for series with
subject: bpf: Bump maximum runtime call stack depth to 16
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1052899