diff options
| author |   Jani Nikula <jani.nikula@intel.com> | 2021-11-22 17:35:32 +0200 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2021-11-22 17:35:32 +0200 |
| commit | 448cc2fb3a7b327823a9afd374808c37b8e6194f (patch) | |
| tree | a6d8ca3fa389980b47a495df2fb10892157c7dbc /kernel/livepatch/patch.c | |
| parent | drm/i915/rpm: Enable runtime pm autosuspend by default (diff) | |
| parent | Linux 5.16-rc2 (diff) | |
Merge drm/drm-next into drm-intel-next
Sync up with drm-next to get v5.16-rc2.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'kernel/livepatch/patch.c')
| -rw-r--r-- | kernel/livepatch/patch.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c index e8029aea67f1..fe316c021d73 100644 --- a/kernel/livepatch/patch.c +++ b/kernel/livepatch/patch.c @@ -49,14 +49,15 @@ static void notrace klp_ftrace_handler(unsigned long ip, ops = container_of(fops, struct klp_ops, fops); + /* + * The ftrace_test_recursion_trylock() will disable preemption, + * which is required for the variant of synchronize_rcu() that is + * used to allow patching functions where RCU is not watching. + * See klp_synchronize_transition() for more details. + */ bit = ftrace_test_recursion_trylock(ip, parent_ip); if (WARN_ON_ONCE(bit < 0)) return; - /* - * A variant of synchronize_rcu() is used to allow patching functions - * where RCU is not watching, see klp_synchronize_transition(). - */ - preempt_disable_notrace(); func = list_first_or_null_rcu(&ops->func_stack, struct klp_func, stack_node); @@ -120,7 +121,6 @@ static void notrace klp_ftrace_handler(unsigned long ip, klp_arch_set_pc(fregs, (unsigned long)func->new_func); unlock: - preempt_enable_notrace(); ftrace_test_recursion_unlock(bit); } |