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Message-ID: <20260107111657.1f30d1f6@canb.auug.org.au>
Date: Wed, 7 Jan 2026 11:16:57 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Ballasi <tballasi@...ux.microsoft.com>, Linux Kernel Mailing List
<linux-kernel@...r.kernel.org>, Linux Next Mailing List
<linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the mm-unstable tree
Hi all,
After merging the mm-unstable tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:
In file included from include/trace/define_trace.h:132,
from include/trace/events/vmscan.h:569,
from mm/vmscan.c:73:
include/trace/events/vmscan.h: In function 'do_trace_event_raw_event_mm_shrink_slab_start':
include/trace/events/vmscan.h:248:68: error: invalid use of undefined type 'struct mem_cgroup'
248 | __entry->memcg_id = sc->memcg ? cgroup_id(sc->memcg->css.cgroup) : 0;
| ^~
include/trace/trace_events.h:427:11: note: in definition of macro '__DECLARE_EVENT_CLASS'
427 | { assign; } \
| ^~~~~~
include/trace/trace_events.h:435:23: note: in expansion of macro 'PARAMS'
435 | PARAMS(assign), PARAMS(print)) \
| ^~~~~~
include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
40 | DECLARE_EVENT_CLASS(name, \
| ^~~~~~~~~~~~~~~~~~~
include/trace/trace_events.h:44:30: note: in expansion of macro 'PARAMS'
44 | PARAMS(assign), \
| ^~~~~~
include/trace/events/vmscan.h:214:1: note: in expansion of macro 'TRACE_EVENT'
214 | TRACE_EVENT(mm_shrink_slab_start,
| ^~~~~~~~~~~
include/trace/events/vmscan.h:237:9: note: in expansion of macro 'TP_fast_assign'
237 | TP_fast_assign(
| ^~~~~~~~~~~~~~
include/trace/events/vmscan.h: In function 'do_trace_event_raw_event_mm_shrink_slab_end':
include/trace/events/vmscan.h:293:56: error: invalid use of undefined type 'struct mem_cgroup'
293 | __entry->memcg_id = cgroup_id(sc->memcg->css.cgroup);
| ^~
include/trace/trace_events.h:427:11: note: in definition of macro '__DECLARE_EVENT_CLASS'
427 | { assign; } \
| ^~~~~~
include/trace/trace_events.h:435:23: note: in expansion of macro 'PARAMS'
435 | PARAMS(assign), PARAMS(print)) \
| ^~~~~~
include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
40 | DECLARE_EVENT_CLASS(name, \
| ^~~~~~~~~~~~~~~~~~~
include/trace/trace_events.h:44:30: note: in expansion of macro 'PARAMS'
44 | PARAMS(assign), \
| ^~~~~~
include/trace/events/vmscan.h:266:1: note: in expansion of macro 'TRACE_EVENT'
266 | TRACE_EVENT(mm_shrink_slab_end,
| ^~~~~~~~~~~
include/trace/events/vmscan.h:285:9: note: in expansion of macro 'TP_fast_assign'
285 | TP_fast_assign(
| ^~~~~~~~~~~~~~
In file included from include/trace/define_trace.h:133:
include/trace/events/vmscan.h: In function 'do_perf_trace_mm_shrink_slab_start':
include/trace/events/vmscan.h:248:68: error: invalid use of undefined type 'struct mem_cgroup'
248 | __entry->memcg_id = sc->memcg ? cgroup_id(sc->memcg->css.cgroup) : 0;
| ^~
include/trace/perf.h:51:11: note: in definition of macro '__DECLARE_EVENT_CLASS'
51 | { assign; } \
| ^~~~~~
include/trace/perf.h:67:23: note: in expansion of macro 'PARAMS'
67 | PARAMS(assign), PARAMS(print)) \
| ^~~~~~
include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
40 | DECLARE_EVENT_CLASS(name, \
| ^~~~~~~~~~~~~~~~~~~
include/trace/trace_events.h:44:30: note: in expansion of macro 'PARAMS'
44 | PARAMS(assign), \
| ^~~~~~
include/trace/events/vmscan.h:214:1: note: in expansion of macro 'TRACE_EVENT'
214 | TRACE_EVENT(mm_shrink_slab_start,
| ^~~~~~~~~~~
include/trace/events/vmscan.h:237:9: note: in expansion of macro 'TP_fast_assign'
237 | TP_fast_assign(
| ^~~~~~~~~~~~~~
include/trace/events/vmscan.h: In function 'do_perf_trace_mm_shrink_slab_end':
include/trace/events/vmscan.h:293:56: error: invalid use of undefined type 'struct mem_cgroup'
293 | __entry->memcg_id = cgroup_id(sc->memcg->css.cgroup);
| ^~
include/trace/perf.h:51:11: note: in definition of macro '__DECLARE_EVENT_CLASS'
51 | { assign; } \
| ^~~~~~
include/trace/perf.h:67:23: note: in expansion of macro 'PARAMS'
67 | PARAMS(assign), PARAMS(print)) \
| ^~~~~~
include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
40 | DECLARE_EVENT_CLASS(name, \
| ^~~~~~~~~~~~~~~~~~~
include/trace/trace_events.h:44:30: note: in expansion of macro 'PARAMS'
44 | PARAMS(assign), \
| ^~~~~~
include/trace/events/vmscan.h:266:1: note: in expansion of macro 'TRACE_EVENT'
266 | TRACE_EVENT(mm_shrink_slab_end,
| ^~~~~~~~~~~
include/trace/events/vmscan.h:285:9: note: in expansion of macro 'TP_fast_assign'
285 | TP_fast_assign(
| ^~~~~~~~~~~~~~
Caused by commit
6093cd0a2a93 ("mm: vmscan: add cgroup IDs to vmscan tracepoints")
$ grep MEMCG .config
# CONFIG_MEMCG is not set
I have applied the following hack for today.
From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Wed, 7 Jan 2026 10:38:50 +1100
Subject: [PATCH] fix up for "mm: vmscan: add cgroup IDs to vmscan tracepoints"
Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
include/trace/events/vmscan.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index d438abfa03eb..6a8ec045ae58 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -245,7 +245,11 @@ TRACE_EVENT(mm_shrink_slab_start,
__entry->priority = priority;
__entry->nid = sc->nid;
__entry->pid = current->pid;
+#ifdef CONFIG_MEMCG
__entry->memcg_id = sc->memcg ? cgroup_id(sc->memcg->css.cgroup) : 0;
+#else
+ __entry->memcg_id = 0;
+#endif
),
TP_printk("%pS %p: nid: %d pid: %d memcg_id: %u objects to shrink %ld gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d %s",
@@ -290,7 +294,11 @@ TRACE_EVENT(mm_shrink_slab_end,
__entry->nid = sc->nid;
__entry->retval = shrinker_retval;
__entry->pid = current->pid;
+#ifdef CONFIG_MEMCG
__entry->memcg_id = cgroup_id(sc->memcg->css.cgroup);
+#else
+ __entry->memcg_id = 0;
+#endif
),
TP_printk("%pS %p: nid: %d pid: %d memcg_id: %u unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d %s",
--
2.52.0
--
Cheers,
Stephen Rothwell
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