linux-kernel - Re: [PATCH] locking/rtmutex: Add the missing 'ES' of macro CONFIG_DEBUG_RT

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Date:   Tue, 10 Aug 2021 09:21:15 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Will Deacon <will@...nel.org>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] locking/rtmutex: Add the missing 'ES' of macro
 CONFIG_DEBUG_RT_MUTEXES



On 2021/8/9 22:41, Will Deacon wrote:
> On Sat, Jul 31, 2021 at 08:30:11PM +0800, Zhen Lei wrote:
>> The build option name is defined as DEBUG_RT_MUTEXES in lib/Kconfig.debug,
>> commit f41dcc18698e ("locking/rtmutex: Move debug functions as inlines
>> into common header") can also corroborate this.
>>
>> Fixes: f7efc4799f81 ("locking/rtmutex: Inline chainwalk depth check")
>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>> ---
>>  kernel/locking/rtmutex.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
>> index b5d9bb5202c6..ad0db322ed3b 100644
>> --- a/kernel/locking/rtmutex.c
>> +++ b/kernel/locking/rtmutex.c
>> @@ -343,7 +343,7 @@ static __always_inline bool
>>  rt_mutex_cond_detect_deadlock(struct rt_mutex_waiter *waiter,
>>  			      enum rtmutex_chainwalk chwalk)
>>  {
>> -	if (IS_ENABLED(CONFIG_DEBUG_RT_MUTEX))
>> +	if (IS_ENABLED(CONFIG_DEBUG_RT_MUTEXES))
>>  		return waiter != NULL;
>>  	return chwalk == RT_MUTEX_FULL_CHAINWALK;
> 
> Oops, yes. How did you find this?

I found it by chance. When locating a futex problem, I was confused when
reading this part of the code. I used "git grep -wn CONFIG_DEBUG_RT_MUTEX"
to search for the implementation in other places. But I found that it was
not used in other places, then I checked the patch history and found it.

> 
> Acked-by: Will Deacon <will@...nel.org>
> 
> Will
> .
>