diff options
author | Kevin Hilman <khilman@linaro.org> | 2015-11-04 10:01:20 -0800 |
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committer | Kevin Hilman <khilman@linaro.org> | 2015-11-04 10:01:20 -0800 |
commit | 49bd04cb11e57c4cd4d2c00feca898537dd6db1f (patch) | |
tree | 846c594b2b1d2f203c24ff32569b6c615822a5dc /arch/arm64/kernel/debug-monitors.c | |
parent | 260409578ecbf7ce1725b85f9c082312bff808c0 (diff) | |
parent | 12ba397b828b7e7f5d28a73e9a2ee14470b7edc7 (diff) |
Merge tag 'v4.1.12-rt12' of git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel into v4.1/topic/rtv4.1/topic/rt
v4.1.12-rt12
Diffstat (limited to 'arch/arm64/kernel/debug-monitors.c')
-rw-r--r-- | arch/arm64/kernel/debug-monitors.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index b056369fd47d..70654d843d9b 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -271,20 +271,21 @@ static int single_step_handler(unsigned long addr, unsigned int esr, * Use reader/writer locks instead of plain spinlock. */ static LIST_HEAD(break_hook); -static DEFINE_RWLOCK(break_hook_lock); +static DEFINE_SPINLOCK(break_hook_lock); void register_break_hook(struct break_hook *hook) { - write_lock(&break_hook_lock); - list_add(&hook->node, &break_hook); - write_unlock(&break_hook_lock); + spin_lock(&break_hook_lock); + list_add_rcu(&hook->node, &break_hook); + spin_unlock(&break_hook_lock); } void unregister_break_hook(struct break_hook *hook) { - write_lock(&break_hook_lock); - list_del(&hook->node); - write_unlock(&break_hook_lock); + spin_lock(&break_hook_lock); + list_del_rcu(&hook->node); + spin_unlock(&break_hook_lock); + synchronize_rcu(); } static int call_break_hook(struct pt_regs *regs, unsigned int esr) @@ -292,11 +293,11 @@ 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); - list_for_each_entry(hook, &break_hook, node) + rcu_read_lock(); + list_for_each_entry_rcu(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; } |