diff options
| author | Dave Airlie <airlied@redhat.com> | 2025-09-15 17:51:07 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2025-09-15 17:51:07 +1000 |
| commit | 0d9f0083f7a5a31d91d501467b499bb8c4b25bdf (patch) | |
| tree | 5670a6d87e7cb5c421809babf9dc9e72ff40f8ae /kernel/futex/core.c | |
| parent | 2cda9a063dd6f21e5294092a679afdcd0fc58549 (diff) | |
| parent | f83ec76bf285bea5727f478a68b894f5543ca76e (diff) | |
Merge tag 'v6.17-rc6' into drm-next
This is a backmerge of Linux 6.17-rc6, needed for msm,
also requested by misc.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'kernel/futex/core.c')
| -rw-r--r-- | kernel/futex/core.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/kernel/futex/core.c b/kernel/futex/core.c index d9bb5567af0c..125804fbb5cb 100644 --- a/kernel/futex/core.c +++ b/kernel/futex/core.c @@ -1722,12 +1722,9 @@ int futex_mm_init(struct mm_struct *mm) RCU_INIT_POINTER(mm->futex_phash, NULL); mm->futex_phash_new = NULL; /* futex-ref */ + mm->futex_ref = NULL; atomic_long_set(&mm->futex_atomic, 0); mm->futex_batches = get_state_synchronize_rcu(); - mm->futex_ref = alloc_percpu(unsigned int); - if (!mm->futex_ref) - return -ENOMEM; - this_cpu_inc(*mm->futex_ref); /* 0 -> 1 */ return 0; } @@ -1801,6 +1798,17 @@ static int futex_hash_allocate(unsigned int hash_slots, unsigned int flags) } } + if (!mm->futex_ref) { + /* + * This will always be allocated by the first thread and + * therefore requires no locking. + */ + mm->futex_ref = alloc_percpu(unsigned int); + if (!mm->futex_ref) + return -ENOMEM; + this_cpu_inc(*mm->futex_ref); /* 0 -> 1 */ + } + fph = kvzalloc(struct_size(fph, queues, hash_slots), GFP_KERNEL_ACCOUNT | __GFP_NOWARN); if (!fph) |