diff options
Diffstat (limited to 'debian/patches-rt/0001-hrtimer-Use-READ_ONCE-to-access-timer-base-in-hrimer.patch')
-rw-r--r-- | debian/patches-rt/0001-hrtimer-Use-READ_ONCE-to-access-timer-base-in-hrimer.patch | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/debian/patches-rt/0001-hrtimer-Use-READ_ONCE-to-access-timer-base-in-hrimer.patch b/debian/patches-rt/0001-hrtimer-Use-READ_ONCE-to-access-timer-base-in-hrimer.patch deleted file mode 100644 index 8911788e2..000000000 --- a/debian/patches-rt/0001-hrtimer-Use-READ_ONCE-to-access-timer-base-in-hrimer.patch +++ /dev/null @@ -1,33 +0,0 @@ -From: Julien Grall <julien.grall@arm.com> -Date: Wed, 21 Aug 2019 10:24:07 +0100 -Subject: [PATCH 1/3] hrtimer: Use READ_ONCE to access timer->base in - hrimer_grab_expiry_lock() -Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.17-rt9.tar.xz - -The update to timer->base is protected by the base->cpu_base->lock(). -However, hrtimer_grab_expirty_lock() does not access it with the lock. - -So it would theorically be possible to have timer->base changed under -our feet. We need to prevent the compiler to refetch timer->base so the -check and the access is performed on the same base. - -Other access of timer->base are either done with a lock or protected -with READ_ONCE(). So use READ_ONCE() in hrtimer_grab_expirty_lock(). - -Signed-off-by: Julien Grall <julien.grall@arm.com> -Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> ---- - kernel/time/hrtimer.c | 2 +- - 1 file changed, 1 insertion(+), 1 deletion(-) - ---- a/kernel/time/hrtimer.c -+++ b/kernel/time/hrtimer.c -@@ -932,7 +932,7 @@ EXPORT_SYMBOL_GPL(hrtimer_forward); - - void hrtimer_grab_expiry_lock(const struct hrtimer *timer) - { -- struct hrtimer_clock_base *base = timer->base; -+ struct hrtimer_clock_base *base = READ_ONCE(timer->base); - - if (base && base->cpu_base) { - spin_lock(&base->cpu_base->softirq_expiry_lock); |