[tip: locking/core] futex: Tell kmemleak we're not leaking __futex_queues

[tip-bot2 for Peter Zijlstra]

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     fcb8ada1287227a1392930ee52d7b6c6cab0f0b2
Gitweb:        https://git.kernel.org/tip/fcb8ada1287227a1392930ee52d7b6c6cab0f0b2
Author:        Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate:    Fri, 07 Aug 2026 17:23:53 +02:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Sat, 08 Aug 2026 12:41:59 +02:00

futex: Tell kmemleak we're not leaking __futex_queues

Kmemleak doesn't know about runtime_const stuff and figures we're leaking
__futex_queues. So add this little annotation to tell it all is well.

Fixes: b78b0b658252 ("futex: Use runtime constants for __futex_hash() hot path")
Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-lkp/202608071053.6db6276e-lkp@xxxxxxxxx
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20260807152353.GP687043@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
---
 kernel/futex/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index d3fcad4..45538ac 100644
--- a/kernel/futex/core.c
+++ b/kernel/futex/core.c
@@ -45,6 +45,7 @@
 #include <linux/rseq.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
+#include <linux/kmemleak.h>
 
 #include <vdso/futex.h>
 
@@ -2028,6 +2029,7 @@ static int __init futex_init(void)
 	order = get_order(size);
 
 	__futex_queues = kcalloc(nr_node_ids, sizeof(*__futex_queues), GFP_KERNEL);
+	kmemleak_not_leak(__futex_queues);
 
 	runtime_const_init(shift, __futex_shift);
 	runtime_const_init(mask,  __futex_mask);