bpf: Export bpf_dynptr_set_size

It will be used by the following patch to shrink the size of dynptr when the actual data length is smaller than the size of dynptr during map_get_next_key operation. Signed-off-by: Hou Tao <[email protected]>
kernel-patches · Jan 25, 2025 · 19f1cf9 · 19f1cf9
1 parent 1aad10d
commit 19f1cf9
Show file tree

Hide file tree

Showing 2 changed files with 2 additions and 1 deletion.
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
@@ -1351,6 +1351,7 @@ enum bpf_dynptr_type {
 };
 
 int bpf_dynptr_check_size(u32 size);
+void bpf_dynptr_set_size(struct bpf_dynptr_kern *ptr, u32 new_size);
 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
 const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);
 void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
@@ -1688,7 +1688,7 @@ u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr)
 	return ptr->size & DYNPTR_SIZE_MASK;
 }
 
-static void bpf_dynptr_set_size(struct bpf_dynptr_kern *ptr, u32 new_size)
+void bpf_dynptr_set_size(struct bpf_dynptr_kern *ptr, u32 new_size)
 {
 	u32 metadata = ptr->size & ~DYNPTR_SIZE_MASK;