diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2025-07-10 13:00:09 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-07-11 16:02:01 +0200 |
| commit | 760e6f7befbab9a84c54457a8ee45313b7b91ee5 (patch) | |
| tree | ad88ab0a0fa24ef4dd7c411fdb2a04de4399d347 /include | |
| parent | fb3c553da7fa9991f9b1436d91dbb78c7477c86a (diff) | |
futex: Remove support for IMMUTABLE
The FH_FLAG_IMMUTABLE flag was meant to avoid the reference counting on
the private hash and so to avoid the performance regression on big
machines.
With the switch to per-CPU counter this is no longer needed. That flag
was never useable on any released kernel.
Remove any support for IMMUTABLE while preserve the flags argument and
enforce it to be zero.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250710110011.384614-5-bigeasy@linutronix.de
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/prctl.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h index 43dec6eed559..3b93fb906e3c 100644 --- a/include/uapi/linux/prctl.h +++ b/include/uapi/linux/prctl.h @@ -367,8 +367,6 @@ struct prctl_mm_map { /* FUTEX hash management */ #define PR_FUTEX_HASH 78 # define PR_FUTEX_HASH_SET_SLOTS 1 -# define FH_FLAG_IMMUTABLE (1ULL << 0) # define PR_FUTEX_HASH_GET_SLOTS 2 -# define PR_FUTEX_HASH_GET_IMMUTABLE 3 #endif /* _LINUX_PRCTL_H */ |