I put together a patch, this is my first debian bug submission, so I am
sorry if I messed anything up.
Thomas S. Hatch
From 08b0a5d20231f7a7580f87b753570c879655fd28 Mon Sep 17 00:00:00 2001
From: Thomas S Hatch <[email protected]>
Date: Mon, 12 Oct 2026 17:16:05 -0600
Subject: [PATCH] stats: fix v7.2 loss of snmp_fold_field()
Since b056e7326724 ("ipv4: remove obsolete EXPORT_SYMBOL() and
EXPORT_SYMBOL_GPL()") snmp_fold_field() is no longer exported by the
kernel, so building the jool_common module on kernel >= 7.2 fails with:
ERROR: modpost: "snmp_fold_field" [jool_common.ko] undefined!
The body of snmp_fold_field() has been unchanged since kernel 4.3 and
snmp_get_cpu_field() is a static inline in net/ip.h, so we inline the
fold directly in jstat_query(). This works on all supported kernels
and removes the dependency on the exported symbol.
This mirrors upstream commits 47a8c7426f08 ("stats: fix v7.2 loss of
snmp_fold_field()") and fc5f37d8aab1 ("Remove snmp_fold_field()
preprocessor conditional"), which fix the same issue in upstream Jool.
Signed-off-by: Thomas S Hatch <[email protected]>
---
src/mod/common/stats.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/src/mod/common/stats.c b/src/mod/common/stats.c
index 3144475..31190a0 100644
--- a/src/mod/common/stats.c
+++ b/src/mod/common/stats.c
@@ -4,6 +4,7 @@
#include <net/ip.h>
#include <net/snmp.h>
#include "mod/common/wkmalloc.h"
+#include "mod/common/linux_version.h"
struct jool_mib {
unsigned long mibs[JSTAT_COUNT];
@@ -79,8 +80,11 @@ __u64 *jstat_query(struct jool_stats *stats)
if (!result)
return NULL;
- for (i = 0; i < JSTAT_COUNT; i++)
- result[i] = snmp_fold_field(stats->mib, i);
+ for (i = 0; i < JSTAT_COUNT; i++) {
+ int cpu;
+ for_each_possible_cpu(cpu)
+ result[i] += snmp_get_cpu_field(stats->mib, cpu, i);
+ }
return result;
}
--
2.53.0
--- debian/changelog 2026-01-26 14:14:24.000000000 -0700
+++ /home/thatch/dev/jool/work/jool-4.1.15/debian/changelog 2026-10-12 17:17:10.714155901 -0600
@@ -1,3 +1,16 @@
+jool (4.1.15-2) unstable; urgency=medium
+
+ * Fix DKMS build failure on kernel >= 7.2: since upstream kernel commit
+ b056e7326724 ("ipv4: remove obsolete EXPORT_SYMBOL() and
+ EXPORT_SYMBOL_GPL()"), snmp_fold_field() is no longer exported by the
+ kernel, so building the jool_common module fails with:
+ "modpost: snmp_fold_field [jool_common.ko] undefined!".
+ Inline the fold in jstat_query() using snmp_get_cpu_field(), which is
+ a static inline in net/ip.h and works on all supported kernels. The
+ patch mirrors upstream Jool commits 47a8c7426f08 and fc5f37d8aab1.
+
+ -- Thomas S Hatch <[email protected]> Mon, 12 Oct 2026 17:20:00 -0600
+
jool (4.1.15-1) unstable; urgency=medium
* New upstream release
--- /dev/null
+++ b/debian/patches/series
@@ -0,0 +1 @@
0001-stats-fix-v7.2-loss-of-snmp_fold_field.patch
