[PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Jay Wang <hidden> · 2026-10-01
[PATCH bpf-next v4 01/12] bpf: pass the vmlinux BTF to btf_parse_module() and let it adopt the data · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 01/12] bpf: pass the vmlinux BTF to btf_parse_module() and let it adopt the data · sashiko-bot@kernel.org · 2026-10-02
[PATCH bpf-next v4 02/12] bpf: split the kfunc, dtor kfunc and struct_ops registration bodies · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 02/12] bpf: split the kfunc, dtor kfunc and struct_ops registration bodies · sashiko-bot@kernel.org · 2026-10-02
[PATCH bpf-next v4 03/12] bpf: fetch the vmlinux BTF where kernel types enter a program · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 03/12] bpf: fetch the vmlinux BTF where kernel types enter a program · sashiko-bot@kernel.org · 2026-10-02
[PATCH bpf-next v4 04/12] bpf: take the vmlinux BTF from the btf_vmlinux module · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 04/12] bpf: take the vmlinux BTF from the btf_vmlinux module · bot+bpf-ci@kernel.org · 2026-10-01
Re: [PATCH bpf-next v4 04/12] bpf: take the vmlinux BTF from the btf_vmlinux module · sashiko-bot@kernel.org · 2026-10-02
Re: [PATCH bpf-next v4 04/12] bpf: take the vmlinux BTF from the btf_vmlinux module · Alexei Starovoitov <hidden> · 2026-10-02
[PATCH bpf-next v4 05/12] bpf, tracing: load the vmlinux BTF where tracefs and bpffs requests start · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 05/12] bpf, tracing: load the vmlinux BTF where tracefs and bpffs requests start · sashiko-bot@kernel.org · 2026-10-02
[PATCH bpf-next v4 06/12] bpf: defer vmlinux kfunc and struct_ops registrations · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 06/12] bpf: defer vmlinux kfunc and struct_ops registrations · sashiko-bot@kernel.org · 2026-10-02
[PATCH bpf-next v4 07/12] bpf: keep module BTF until the vmlinux BTF is available · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 07/12] bpf: keep module BTF until the vmlinux BTF is available · bot+bpf-ci@kernel.org · 2026-10-01
Re: [PATCH bpf-next v4 07/12] bpf: keep module BTF until the vmlinux BTF is available · sashiko-bot@kernel.org · 2026-10-02
[PATCH bpf-next v4 08/12] bpf: expose deferred .BTF.base module BTF in sysfs from module load · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 08/12] bpf: expose deferred .BTF.base module BTF in sysfs from module load · sashiko-bot@kernel.org · 2026-10-02
[PATCH bpf-next v4 09/12] bpf, trace, net: prepare CONFIG_DEBUG_INFO_BTF checks for a tristate · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 09/12] bpf, trace, net: prepare CONFIG_DEBUG_INFO_BTF checks for a tristate · sashiko-bot@kernel.org · 2026-10-02
Re: [PATCH bpf-next v4 09/12] bpf, trace, net: prepare CONFIG_DEBUG_INFO_BTF checks for a tristate · Nicolas Schier <nsc@kernel.org> · 2026-10-05
[PATCH bpf-next v4 10/12] resolve_btfids: add --btf_link to fill in .BTF.link records · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 10/12] resolve_btfids: add --btf_link to fill in .BTF.link records · bot+bpf-ci@kernel.org · 2026-10-01
Re: [PATCH bpf-next v4 10/12] resolve_btfids: add --btf_link to fill in .BTF.link records · sashiko-bot@kernel.org · 2026-10-02
[PATCH bpf-next v4 11/12] tools, samples: take the vmlinux BTF from vmlinux.unstripped first · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 11/12] tools, samples: take the vmlinux BTF from vmlinux.unstripped first · sashiko-bot@kernel.org · 2026-10-02
Re: [PATCH bpf-next v4 11/12] tools, samples: take the vmlinux BTF from vmlinux.unstripped first · Nicolas Schier <nsc@kernel.org> · 2026-10-05
[PATCH bpf-next v4 12/12] kbuild, bpf: allow building the vmlinux BTF as a module · Jay Wang <hidden> · 2026-10-01
Re: [PATCH bpf-next v4 12/12] kbuild, bpf: allow building the vmlinux BTF as a module · sashiko-bot@kernel.org · 2026-10-02
Re: [PATCH bpf-next v4 12/12] kbuild, bpf: allow building the vmlinux BTF as a module · Alan Maguire <hidden> · 2026-10-02
Re: [PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Ihor Solodrai <ihor.solodrai@linux.dev> · 2026-10-02
Re: [PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Jay Wang <hidden> · 2026-10-02
Re: [PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Alan Maguire <hidden> · 2026-10-02
Re: [PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Ihor Solodrai <ihor.solodrai@linux.dev> · 2026-10-02
Re: [PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Alexei Starovoitov <hidden> · 2026-10-03
Re: [PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Alan Maguire <hidden> · 2026-10-03
Re: [PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Alexei Starovoitov <hidden> · 2026-10-03
Re: [PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Jay Wang <hidden> · 2026-10-04
Re: [PATCH bpf-next v4 00/12] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory · Ihor Solodrai <ihor.solodrai@linux.dev> · 2026-10-05

Re: [PATCH bpf-next v4 01/12] bpf: pass the vmlinux BTF to btf_parse_module() and let it adopt the data

From: sashiko-bot@kernel.org
Date: 2026-10-02 09:14:10
Also in: bpf, linux-input, linux-modules, linux-perf-users, sched-ext

Make btf_parse_module() take the vmlinux BTF as an argument instead of
fetching it with bpf_get_btf_vmlinux(), and add a data_owned flag: when
set, the passed .BTF data is an already kvmalloc()ed copy that the new
btf takes ownership of on success (on failure the caller keeps it).

Factor the sysfs file creation out of the module notifier into
btf_module_sysfs_add() and the teardown into btf_module_free(), and set
btf_mod->module right after the allocation rather than under the mutex.

No functional change.  This prepares for CONFIG_DEBUG_INFO_BTF=m, where a
module can be loaded before the vmlinux BTF is available: its .BTF is
then copied and exposed in sysfs first and parsed later, at which point
the parser must take the copy as is so that the sysfs file keeps
pointing at valid data.

Signed-off-by: Jay Wang <redacted>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261001225214.12351-1-wanjay@amazon.com?part=1

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