bpf: Replace the document for PTR_TO_BTF_ID_OR_NULL

Commit c25b2ae13603 ("bpf: Replace PTR_TO_XXX_OR_NULL with PTR_TO_XXX |
PTR_MAYBE_NULL") moved the fields around and misplaced the
documentation for "PTR_TO_BTF_ID_OR_NULL". So, let's replace it in the
proper place.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241111124911.1436911-1-dongml2@chinatelecom.cn

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 1b84613..7da41ae 100644 (file)
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -932,10 +932,6 @@ enum bpf_reg_type {
         * additional context, assume the value is non-null.
         */
        PTR_TO_BTF_ID,
-       /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
-        * been checked for null. Used primarily to inform the verifier
-        * an explicit null check is required for this struct.
-        */
        PTR_TO_MEM,              /* reg points to valid memory region */
        PTR_TO_ARENA,
        PTR_TO_BUF,              /* reg points to a read/write buffer */
@@ -948,6 +944,10 @@ enum bpf_reg_type {
        PTR_TO_SOCKET_OR_NULL           = PTR_MAYBE_NULL | PTR_TO_SOCKET,
        PTR_TO_SOCK_COMMON_OR_NULL      = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
        PTR_TO_TCP_SOCK_OR_NULL         = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
+       /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
+        * been checked for null. Used primarily to inform the verifier
+        * an explicit null check is required for this struct.
+        */
        PTR_TO_BTF_ID_OR_NULL           = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
 
        /* This must be the last entry. Its purpose is to ensure the enum is