From: Malin Jonsson <malin.jonsson@est.tech>
To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org
Cc: bpf@vger.kernel.org, Malin Jonsson <malin.jonsson@est.tech>,
Yong Gu <yong.g.gu@ericsson.com>,
Mykyta Yatsenko <yatsenko@meta.com>
Subject: [PATCH] bpf: Conditionally include dynptr copy kfuncs
Date: Fri, 24 Oct 2025 17:14:36 +0200 [thread overview]
Message-ID: <20251024151436.139131-1-malin.jonsson@est.tech> (raw)
Since commit a498ee7576de ("bpf: Implement dynptr copy kfuncs"), if
CONFIG_BPF_EVENTS is not enabled, but BPF_SYSCALL and DEBUG_INFO_BTF are,
the build will break like so:
BTFIDS vmlinux.unstripped
WARN: resolve_btfids: unresolved symbol bpf_probe_read_user_str_dynptr
WARN: resolve_btfids: unresolved symbol bpf_probe_read_user_dynptr
WARN: resolve_btfids: unresolved symbol bpf_probe_read_kernel_str_dynptr
WARN: resolve_btfids: unresolved symbol bpf_probe_read_kernel_dynptr
WARN: resolve_btfids: unresolved symbol bpf_copy_from_user_task_str_dynptr
WARN: resolve_btfids: unresolved symbol bpf_copy_from_user_task_dynptr
WARN: resolve_btfids: unresolved symbol bpf_copy_from_user_str_dynptr
WARN: resolve_btfids: unresolved symbol bpf_copy_from_user_dynptr
make[2]: *** [scripts/Makefile.vmlinux:72: vmlinux.unstripped] Error 255
make[2]: *** Deleting file 'vmlinux.unstripped'
make[1]: *** [/repo/malin/upstream/linux/Makefile:1242: vmlinux] Error 2
make: *** [Makefile:248: __sub-make] Error 2
Guard these symbols with #ifdef CONFIG_BPF_EVENTS to resolve the problem.
Reported-by: Yong Gu <yong.g.gu@ericsson.com>
Acked-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Malin Jonsson <malin.jonsson@est.tech>
---
kernel/bpf/helpers.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 8eb117c52817..eb25e70e0bdc 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -4345,6 +4345,7 @@ BTF_ID_FLAGS(func, bpf_iter_kmem_cache_next, KF_ITER_NEXT | KF_RET_NULL | KF_SLE
BTF_ID_FLAGS(func, bpf_iter_kmem_cache_destroy, KF_ITER_DESTROY | KF_SLEEPABLE)
BTF_ID_FLAGS(func, bpf_local_irq_save)
BTF_ID_FLAGS(func, bpf_local_irq_restore)
+#ifdef CONFIG_BPF_EVENTS
BTF_ID_FLAGS(func, bpf_probe_read_user_dynptr)
BTF_ID_FLAGS(func, bpf_probe_read_kernel_dynptr)
BTF_ID_FLAGS(func, bpf_probe_read_user_str_dynptr)
@@ -4353,6 +4354,7 @@ BTF_ID_FLAGS(func, bpf_copy_from_user_dynptr, KF_SLEEPABLE)
BTF_ID_FLAGS(func, bpf_copy_from_user_str_dynptr, KF_SLEEPABLE)
BTF_ID_FLAGS(func, bpf_copy_from_user_task_dynptr, KF_SLEEPABLE | KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_copy_from_user_task_str_dynptr, KF_SLEEPABLE | KF_TRUSTED_ARGS)
+#endif
#ifdef CONFIG_DMA_SHARED_BUFFER
BTF_ID_FLAGS(func, bpf_iter_dmabuf_new, KF_ITER_NEW | KF_SLEEPABLE)
BTF_ID_FLAGS(func, bpf_iter_dmabuf_next, KF_ITER_NEXT | KF_RET_NULL | KF_SLEEPABLE)
--
2.51.1
next reply other threads:[~2025-10-24 15:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-24 15:14 Malin Jonsson [this message]
2025-10-24 16:10 ` [PATCH] bpf: Conditionally include dynptr copy kfuncs Mykyta Yatsenko
2025-10-24 16:50 ` patchwork-bot+netdevbpf
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