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authorLinus Torvalds <torvalds@linux-foundation.org>2018-01-28 20:20:35 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-28 20:20:35 +0100
commit8c76e31a6af1f27f7ccd381757adcae2984eac91 (patch)
tree203ef348b8b3d86d95e2d98fb237eb5141e85a3c
parentMerge tag 'riscv-for-linus-4.15-maintainers' of git://git.kernel.org/pub/scm/... (diff)
parentlocking/lockdep: Avoid triggering hardlockup from debug_show_all_locks() (diff)
downloadlinux-8c76e31a6af1f27f7ccd381757adcae2984eac91.tar.xz
linux-8c76e31a6af1f27f7ccd381757adcae2984eac91.zip
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.c6
-rw-r--r--kernel/locking/lockdep.c2
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");