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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
This commit is contained in:
Linus Torvalds 2018-01-28 11:20:35 -08:00
parent c4e0ca7fa2 88f1c87de1
commit 8c76e31a6a
2 changed files with 5 additions and 3 deletions
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6
kernel/futex.c
View File

@ -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 @@ static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
}
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;

2
kernel/locking/lockdep.c
View File

@ -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 @@ void debug_show_all_locks(void)
if (!unlock)
if (read_trylock(&tasklist_lock))
unlock = 1;
touch_nmi_watchdog();
} while_each_thread(g, p);
pr_warn("\n");