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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-28 22:20:35 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-28 22:20:35 +0300 |
| commit | 8c76e31a6af1f27f7ccd381757adcae2984eac91 (patch) | |
| tree | 203ef348b8b3d86d95e2d98fb237eb5141e85a3c | |
| parent | c4e0ca7fa24137e372d6135fe16e8df8e123f116 (diff) | |
| parent | 88f1c87de11a86d839f4ce5313e552d96709b990 (diff) | |
| download | linux-8c76e31a6af1f27f7ccd381757adcae2984eac91.tar.xz | |
Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fixes from Thomas Gleixner:
"Two final locking fixes for 4.15:
- Repair the OWNER_DIED logic in the futex code which got wreckaged
with the recent fix for a subtle race condition.
- Prevent the hard lockup detector from triggering when dumping all
held locks in the system"
* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/lockdep: Avoid triggering hardlockup from debug_show_all_locks()
futex: Fix OWNER_DEAD fixup
| -rw-r--r-- | kernel/futex.c | 6 | ||||
| -rw-r--r-- | kernel/locking/lockdep.c | 2 |
2 files changed, 5 insertions, 3 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index 8c5424dd5924..7f719d110908 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -2311,9 +2311,6 @@ static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q, raw_spin_lock_irq(&pi_state->pi_mutex.wait_lock); oldowner = pi_state->owner; - /* Owner died? */ - if (!pi_state->owner) - newtid |= FUTEX_OWNER_DIED; /* * We are here because either: @@ -2374,6 +2371,9 @@ retry: } newtid = task_pid_vnr(newowner) | FUTEX_WAITERS; + /* Owner died? */ + if (!pi_state->owner) + newtid |= FUTEX_OWNER_DIED; if (get_futex_value_locked(&uval, uaddr)) goto handle_fault; diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 5fa1324a4f29..521659044719 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -49,6 +49,7 @@ #include <linux/gfp.h> #include <linux/random.h> #include <linux/jhash.h> +#include <linux/nmi.h> #include <asm/sections.h> @@ -4490,6 +4491,7 @@ retry: if (!unlock) if (read_trylock(&tasklist_lock)) unlock = 1; + touch_nmi_watchdog(); } while_each_thread(g, p); pr_warn("\n"); |