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bpf: Reuse MAX_BPF_FUNC_ARGS for maximum number of arguments

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Currently, MAX_BPF_FUNC_ARGS is used for tracepoint related progs where
the number of parameters cannot exceed MAX_BPF_FUNC_ARGS.

Here, MAX_BPF_FUNC_ARGS is reused to set a limit of the number of arguments
for bpf functions and kfuncs. The current value for MAX_BPF_FUNC_ARGS
is 12 which should be sufficient for majority of bpf functions and
kfuncs.

Acked-by: Puranjay Mohan <puranjay@kernel.org>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260423033511.2542870-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song 2026-04-22 20:35:11 -07:00 committed by Alexei Starovoitov
parent 246ad6e5ee
commit 4439328d38
1 changed files with 5 additions and 0 deletions
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5
include/linux/bpf.h
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@ -1151,6 +1151,11 @@ struct bpf_prog_offload {
/* The longest tracepoint has 12 args.
* See include/trace/bpf_probe.h
*
* Also reuse this macro for maximum number of arguments a BPF function
* or a kfunc can have. Args 1-5 are passed in registers, args 6-12 via
* stack arg slots. The JIT may map some stack arg slots to registers based
* on the native calling convention (e.g., arg 6 to R9 on x86-64).
*/
#define MAX_BPF_FUNC_ARGS 12