diff options
| author |   Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2025-04-16 18:29:13 +0200 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2025-05-03 12:02:08 +0200 |
| commit | 7c4f75a21f636486d2969d9b6680403ea8483539 (patch) | |
| tree | 7ba61bc8ba91244f8180bcd17e7f54679fe9e0aa /kernel/futex/core.c | |
| parent | futex: Add basic infrastructure for local task local hash (diff) | |
| download | wireguard-linux-7c4f75a21f636486d2969d9b6680403ea8483539.tar.xz wireguard-linux-7c4f75a21f636486d2969d9b6680403ea8483539.zip | |
futex: Allow automatic allocation of process wide futex hash
Allocate a private futex hash with 16 slots if a task forks its first
thread.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250416162921.513656-14-bigeasy@linutronix.de
Diffstat (limited to '')
| -rw-r--r-- | kernel/futex/core.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/futex/core.c b/kernel/futex/core.c index 818df7420a1a..53b3a00a9253 100644 --- a/kernel/futex/core.c +++ b/kernel/futex/core.c @@ -1294,6 +1294,17 @@ static int futex_hash_allocate(unsigned int hash_slots, bool custom) return 0; } +int futex_hash_allocate_default(void) +{ + if (!current->mm) + return 0; + + if (current->mm->futex_phash) + return 0; + + return futex_hash_allocate(16, false); +} + static int futex_hash_get_slots(void) { struct futex_private_hash *fph; |