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| author | Ingo Molnar <mingo@kernel.org> | 2017-06-22 10:19:14 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-06-22 10:19:14 +0200 |
| commit | f9e169883164390a15b56d00cb7e22c2e72f4dba (patch) | |
| tree | 2a946cfff76d6dd41005d0dd534e0bd97641019d /kernel/livepatch/patch.c | |
| parent | locking/rtmutex: Don't initialize lockdep when not required (diff) | |
| parent | Merge branch 'for-linus' of git://git.kernel.dk/linux-block (diff) | |
| download | linux-f9e169883164390a15b56d00cb7e22c2e72f4dba.tar.gz linux-f9e169883164390a15b56d00cb7e22c2e72f4dba.zip | |
Merge branch 'linus' into locking/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/livepatch/patch.c')
| -rw-r--r-- | kernel/livepatch/patch.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c index f8269036bf0b..52c4e907c14b 100644 --- a/kernel/livepatch/patch.c +++ b/kernel/livepatch/patch.c @@ -59,7 +59,11 @@ static void notrace klp_ftrace_handler(unsigned long ip, ops = container_of(fops, struct klp_ops, fops); - rcu_read_lock(); + /* + * A variant of synchronize_sched() 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); @@ -115,7 +119,7 @@ static void notrace klp_ftrace_handler(unsigned long ip, klp_arch_set_pc(regs, (unsigned long)func->new_func); unlock: - rcu_read_unlock(); + preempt_enable_notrace(); } /* |