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bpf: Merge printk and seq_printf VARARG max macros
authorDave Marchevsky <davemarchevsky@fb.com>
Fri, 17 Sep 2021 18:29:03 +0000 (11:29 -0700)
committerAlexei Starovoitov <ast@kernel.org>
Fri, 17 Sep 2021 21:02:05 +0000 (14:02 -0700)
commit335ff4990cf3bfa42d8846f9b3d8c09456f51801
treed412d05c1ed76a3a1d2f44b2361bcdf7a24b7cd6
parentaf54faab84f754ebd42ecdda871f8d71940ae40b
bpf: Merge printk and seq_printf VARARG max macros

MAX_SNPRINTF_VARARGS and MAX_SEQ_PRINTF_VARARGS are used by bpf helpers
bpf_snprintf and bpf_seq_printf to limit their varargs. Both call into
bpf_bprintf_prepare for print formatting logic and have convenience
macros in libbpf (BPF_SNPRINTF, BPF_SEQ_PRINTF) which use the same
helper macros to convert varargs to a byte array.

Changing shared functionality to support more varargs for either bpf
helper would affect the other as well, so let's combine the _VARARGS
macros to make this more obvious.

Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210917182911.2426606-2-davemarchevsky@fb.com
include/linux/bpf.h
kernel/bpf/helpers.c
kernel/trace/bpf_trace.c