FAILED: patch "[PATCH] perf: Track the perf mlock gift separately" failed to apply to 6.12-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 78436f3882fb8d848c823bf8cf754988202c5ca5
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026102117-rethink-jaybird-bd86@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 78436f3882fb8d848c823bf8cf754988202c5ca5 Mon Sep 17 00:00:00 2001
From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Date: Sat, 3 Oct 2026 17:29:07 +0100
Subject: [PATCH] perf: Track the perf mlock gift separately

The locked_vm field in struct user_struct was originally introduced by
commit 789f90fcf6b0 ("perf_counter: per user mlock gift") to provide an
mlock-like budget for perf measured against mm->pinned_vm (since 2011).

perf grants each user a 'gift' of perf_event_mlock_kb * online CPUs of
buffer pages which is charged to user->locked_vm without any RLIMIT_MEMLOCK
check.

Only pages beyond the gift are checked against RLIMIT_MEMLOCK, per-mm, via
mm->pinned_vm, which makes it different from the standard mlock() check,
which is per-mm and made against RLIMIT_MEMLOCK.

However, since this was introduced, a number of other components have
utilised this field where a shared resource needed to be limited against
RLIMIT_MEMLOCK.

The other users are currently MSG_ZEROCOPY, io_uring, AF_XDP, iommufd,
s390 KVM zPCI and most recently, secretmem in commit 97d34aa65c29
("mm/secretmem: properly account locked pages").

This field is shared between all of these, but because the gift is not
checked against RLIMIT_MEMLOCK, user->locked_vm alone can exceed it - 16
CPUs * 516 KiB is already more than the default 8 MiB - after which every
other user of the field fails unconditionally.

This was reported by a user who saw secretmem failing while running a
simultaneous perf record.

Resolve the issue by simply giving perf its own field separate from the
rest.

BPF used user->locked_vm up until commit 80ee81e0403c ("bpf: Eliminate
rlimit-based memory accounting infra for bpf maps") which landed in 5.11.

Thus also eliminate the now-defunct ifdef for CONFIG_BPF_SYSCALL for
user->locked_vm.

This issue exists between all of the components which use user->locked_vm
and perf, however secretmem is the first user who has caused a report over
many years and has been backported, so target the fix at that.

Fixes: 97d34aa65c29 ("mm/secretmem: properly account locked pages")
Closes: https://lore.kernel.org/20261002175651.811343-1-ameer.hamza@truenas.com
Reported-by: Ameer Hamza <ameer.hamza@truenas.com>
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261003-perf-locked-vm-fix-v1-1-d214dcaf0d76@kernel.org

diff --git a/include/linux/sched/user.h b/include/linux/sched/user.h
index 8d7e5521f7cd..ec262b605437 100644
--- a/include/linux/sched/user.h
+++ b/include/linux/sched/user.h
@@ -23,11 +23,13 @@ struct user_struct {
 	struct hlist_node uidhash_node;
 	kuid_t uid;
 
-#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
-	defined(CONFIG_NET) || defined(CONFIG_IO_URING) || \
+#if defined(CONFIG_NET) || defined(CONFIG_IO_URING) || \
 	defined(CONFIG_VFIO_PCI_ZDEV_KVM) || IS_ENABLED(CONFIG_IOMMUFD) || \
 	defined(CONFIG_SECRETMEM)
-	atomic_long_t locked_vm;
+	atomic_long_t locked_vm;	/* pinned pages charged to RLIMIT_MEMLOCK */
+#endif
+#ifdef CONFIG_PERF_EVENTS
+	atomic_long_t perf_mlock;	/* perf buffer pages within perf_event_mlock_kb */
 #endif
 #ifdef CONFIG_WATCH_QUEUE
 	atomic_t nr_watches;	/* The number of watches this user currently has */
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 7846d70be57f..8b69d50fcbcb 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7059,7 +7059,7 @@ static void perf_mmap_close(struct vm_area_struct *vma)
 		perf_pmu_output_stop(event);
 
 		/* now it's safe to free the pages */
-		atomic_long_sub(rb->aux_nr_pages - rb->aux_mmap_locked, &mmap_user->locked_vm);
+		atomic_long_sub(rb->aux_nr_pages - rb->aux_mmap_locked, &mmap_user->perf_mlock);
 		atomic64_sub(rb->aux_mmap_locked, &vma->vm_mm->pinned_vm);
 
 		/* this has to be the last one */
@@ -7242,11 +7242,11 @@ static bool perf_mmap_calc_limits(struct vm_area_struct *vma, long *user_extra,
 	/* Increase the limit linearly with more CPUs */
 	user_lock_limit *= num_online_cpus();
 
-	user_locked = atomic_long_read(&user->locked_vm);
+	user_locked = atomic_long_read(&user->perf_mlock);
 
 	/*
 	 * sysctl_perf_event_mlock may have changed, so that
-	 *     user->locked_vm > user_lock_limit
+	 *     user->perf_mlock > user_lock_limit
 	 */
 	if (user_locked > user_lock_limit)
 		user_locked = user_lock_limit;
@@ -7254,7 +7254,7 @@ static bool perf_mmap_calc_limits(struct vm_area_struct *vma, long *user_extra,
 
 	if (user_locked > user_lock_limit) {
 		/*
-		 * charge locked_vm until it hits user_lock_limit;
+		 * charge perf_mlock until it hits user_lock_limit;
 		 * charge the rest from pinned_vm
 		 */
 		*extra = user_locked - user_lock_limit;
@@ -7272,7 +7272,7 @@ static void perf_mmap_account(struct vm_area_struct *vma, long user_extra, long
 {
 	struct user_struct *user = current_user();
 
-	atomic_long_add(user_extra, &user->locked_vm);
+	atomic_long_add(user_extra, &user->perf_mlock);
 	atomic64_add(extra, &vma->vm_mm->pinned_vm);
 }
 
@@ -7281,7 +7281,7 @@ static void perf_mmap_unaccount(struct vm_area_struct *vma, struct perf_buffer *
 	struct user_struct *user = rb->mmap_user;
 
 	atomic_long_sub((perf_data_size(rb) >> PAGE_SHIFT) + 1 - rb->mmap_locked,
-			&user->locked_vm);
+			&user->perf_mlock);
 	atomic64_sub(rb->mmap_locked, &vma->vm_mm->pinned_vm);
 }