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bpf: Migrate bpf_stream_vprintk() to KF_IMPLICIT_ARGS

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Implement bpf_stream_vprintk with an implicit bpf_prog_aux argument,
and remote bpf_stream_vprintk_impl from the kernel.

Update the selftests to use the new API with implicit argument.

bpf_stream_vprintk macro is changed to use the new bpf_stream_vprintk
kfunc, and the extern definition of bpf_stream_vprintk_impl is
replaced accordingly.

Reviewed-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20260120222638.3976562-11-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Ihor Solodrai
2026-01-20 14:26:35 -08:00
committed by Andrii Nakryiko
parent 5d02120e10
commit 977b1f820c
1 changed files with 3 additions and 3 deletions
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6
src/bpf_helpers.h
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@@ -315,8 +315,8 @@ enum libbpf_tristate {
___param, sizeof(___param)); \
})
extern int bpf_stream_vprintk_impl(int stream_id, const char *fmt__str, const void *args,
__u32 len__sz, void *aux__prog) __weak __ksym;
extern int bpf_stream_vprintk(int stream_id, const char *fmt__str, const void *args,
__u32 len__sz) __weak __ksym;
#define bpf_stream_printk(stream_id, fmt, args...) \
({ \
@@ -328,7 +328,7 @@ extern int bpf_stream_vprintk_impl(int stream_id, const char *fmt__str, const vo
___bpf_fill(___param, args); \
_Pragma("GCC diagnostic pop") \
\
bpf_stream_vprintk_impl(stream_id, ___fmt, ___param, sizeof(___param), NULL); \
bpf_stream_vprintk(stream_id, ___fmt, ___param, sizeof(___param)); \
})
/* Use __bpf_printk when bpf_printk call has 3 or fewer fmt args