The branch stable/13 has been updated by hselasky:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=80c0c83b5d77d22b7556ba6cba20401692897d6e

commit 80c0c83b5d77d22b7556ba6cba20401692897d6e
Author:     Hans Petter Selasky <[email protected]>
AuthorDate: 2022-09-27 13:48:16 +0000
Commit:     Hans Petter Selasky <[email protected]>
CommitDate: 2022-10-04 14:40:53 +0000

    sysctl(3): Implement SYSCTL_FOREACH() to iterate all OIDs in a sysctl list.
    
    To avoid using the sysctl list macros directly in external kernel modules.
    
    Reviewed by:            asomers, manu and asiciliano
    Differential Revision:  https://reviews.freebsd.org/D36748
    Sponsored by:   NVIDIA Networking
    
    (cherry picked from commit c075ea46bca6d48ce9f639e4575077d06d392427)
---
 sys/kern/kern_sysctl.c | 11 +++++------
 sys/sys/sysctl.h       |  3 +++
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/sys/kern/kern_sysctl.c b/sys/kern/kern_sysctl.c
index ade5eed8edc3..6718f77ee75b 100644
--- a/sys/kern/kern_sysctl.c
+++ b/sys/kern/kern_sysctl.c
@@ -134,7 +134,7 @@ sysctl_find_oidname(const char *name, struct 
sysctl_oid_list *list)
        struct sysctl_oid *oidp;
 
        SYSCTL_ASSERT_LOCKED();
-       SLIST_FOREACH(oidp, list, oid_link) {
+       SYSCTL_FOREACH(oidp, list) {
                if (strcmp(oidp->oid_name, name) == 0) {
                        return (oidp);
                }
@@ -1016,7 +1016,7 @@ sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, 
int i)
        struct sysctl_oid *oidp;
 
        SYSCTL_ASSERT_LOCKED();
-       SLIST_FOREACH(oidp, l, oid_link) {
+       SYSCTL_FOREACH(oidp, l) {
                for (k=0; k<i; k++)
                        printf(" ");
 
@@ -1332,13 +1332,12 @@ name2oid(char *name, int *oid, int *len, struct 
sysctl_oid **oidpp)
        for (*len = 0; *len < CTL_MAXNAME;) {
                p = strsep(&name, ".");
 
-               oidp = SLIST_FIRST(lsp);
-               for (;; oidp = SLIST_NEXT(oidp, oid_link)) {
-                       if (oidp == NULL)
-                               return (ENOENT);
+               SYSCTL_FOREACH(oidp, lsp) {
                        if (strcmp(p, oidp->oid_name) == 0)
                                break;
                }
+               if (oidp == NULL)
+                       return (ENOENT);
                *oid++ = oidp->oid_number;
                (*len)++;
 
diff --git a/sys/sys/sysctl.h b/sys/sys/sysctl.h
index 8f7741eb0b4c..ecf40cc1bfb5 100644
--- a/sys/sys/sysctl.h
+++ b/sys/sys/sysctl.h
@@ -905,6 +905,9 @@ TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
            NULL);                                                      \
 })
 
+#define        SYSCTL_FOREACH(oidp, list) \
+       SLIST_FOREACH(oidp, list, oid_link)
+
 /*
  * A macro to generate a read-only sysctl to indicate the presence of optional
  * kernel features.

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