[Buildroot] [PATCH 1/3] package/libbpf: update UAPI header installation work-around

[Thomas Perale]

In reply of:
> bpftrace often needs very recent kernel headers, more recent than the
> runtime version actually needed. We already had a workaround in
> libbpf making sure that if the kernel headers are older than 6.1, we
> would install the libbpf provided headers instead.
> 
> As we are about to update bpftrace to a newer version that uses
> BPF_TRACE_KPROBE_SESSION, which was introduced in Linux 6.10, we need
> to update this workaround accordingly and ensure that the libbpf
> header is installed if the kernel headers are older than 6.10.
> 
> This is necessary for the update of bpftrace to 0.26.1.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>

Applied to 2026.05.x. Thanks

> ---
>  package/libbpf/libbpf.mk | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/package/libbpf/libbpf.mk b/package/libbpf/libbpf.mk
> index 5a6d574331..0683ec12c1 100644
> --- a/package/libbpf/libbpf.mk
> +++ b/package/libbpf/libbpf.mk
> @@ -18,14 +18,12 @@ define LIBBPF_BUILD_CMDS
>  		-C $(@D)/src
>  endef
>  
> -# bpftrace uses bpf_iter_link_info.task that was added since kernel 6.1
> +# bpftrace uses BPF_TRACE_KPROBE_SESSION that was added since kernel 6.10
>  # so we need to update some uapi headers in STAGING_DIR if the toolchain
> -# is build with linux-headers < 6.1.
> +# is build with linux-headers < 6.1.0
>  # Otherwise bpftrace is broken due to out of date linux/bpf.h installed
>  # by the toolchain.
> -# https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f0d74c4da1f060d2a66976193712a5e6abd361f5
> -# https://github.com/bpftrace/bpftrace/commit/7578314df67df6bbdffaf493ff3b4d182b235b34
> -ifeq ($(BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_1),)
> +ifeq ($(BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_10),)
>  LIBBPF_UPDATE_UAPI_HEADERS = install_uapi_headers UAPIDIR=/usr/include/bpf
>  
>  define LIBBPF_FIX_STAGING_PC
> -- 
> 2.55.0
> 
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