Messages in this thread | | | Date | Thu, 1 Oct 2015 16:07:35 +0100 | From | Catalin Marinas <> | Subject | Re: [PATCH] arm64: replace read_lock to rcu lock in call_break_hook |
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On Wed, Sep 30, 2015 at 03:59:04PM -0700, Yang Shi wrote: > diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c > index cebf786..eb520d0 100644 > --- a/arch/arm64/kernel/debug-monitors.c > +++ b/arch/arm64/kernel/debug-monitors.c > @@ -292,11 +292,11 @@ static int call_break_hook(struct pt_regs *regs, unsigned int esr) > struct break_hook *hook; > int (*fn)(struct pt_regs *regs, unsigned int esr) = NULL; > > - read_lock(&break_hook_lock); > + rcu_read_lock(); > list_for_each_entry(hook, &break_hook, node) > if ((esr & hook->esr_mask) == hook->esr_val) > fn = hook->fn; > - read_unlock(&break_hook_lock); > + rcu_read_unlock(); > > return fn ? fn(regs, esr) : DBG_HOOK_ERROR; > }
That's not enough, you also need list_(add|del)_rcu where the list is modified, together with list_for_each_entry_rcu() here.
-- Catalin
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