libbpf: Probe percpu data feature

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libbpf needs a reliable way to distinguish kernels that can support
global percpu data from those that cannot.

Add a dedicated feature probe, so libbpf can make capability decisions
early and fail predictably when global percpu data is unavailable.

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20260813152324.97937-5-leon.hwang@linux.dev

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Leon Hwang 2026-08-13 23:23:17 +08:00 • committed by Andrii Nakryiko

parent 6e61f4f8b0

commit 3634e4f2dc

2 changed files with 37 additions and 0 deletions

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35

tools/lib/bpf/features.c

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2

tools/lib/bpf/libbpf_internal.h

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