linux-kernel - Re: [PATCH -next,V2] fscache: support to disable assert macro

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Date:   Wed, 8 Nov 2023 10:25:46 +0800
From:   Zizhi Wo <wozizhi@...wei.com>
To:     Gao Xiang <hsiangkao@...ux.alibaba.com>, <dhowells@...hat.com>
CC:     <linux-cachefs@...hat.com>, <linux-kernel@...r.kernel.org>,
        <yangerkun@...wei.com>
Subject: Re: [PATCH -next,V2] fscache: support to disable assert macro



在 2023/11/7 20:39, Gao Xiang 写道:
> 
> 
> On 2023/11/7 18:16, Zizhi Wo wrote:
>> friendly ping
>>
>> 在 2023/11/2 0:34, WoZ1zh1 写道:
>>> In fs/fscache/internal.h, ASSERT macro is enabled by default and can not
>>> be disabled, then assert failure will crash the kernel as the BUG() is
>>> included in the ASSERT macro. Therefore, add FSCACHE_ASSERT to 
>>> control it.
> 
> Personally it looks good to me, yet we could also turn
> them into WARN_ON_ONCE case by case? Anyway, it depends
> on how David thinks...
>
Thank you for your recognition!

Thanks,
Zizhi Wo

> Thanks,
> Gao Xiang
> 
>>>
>>> Signed-off-by: WoZ1zh1 <wozizhi@...wei.com>
>>> ---
>>>   fs/fscache/Kconfig    | 10 ++++++++++
>>>   fs/fscache/internal.h |  2 +-
>>>   2 files changed, 11 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/fs/fscache/Kconfig b/fs/fscache/Kconfig
>>> index b313a978ae0a..7ff844038bc3 100644
>>> --- a/fs/fscache/Kconfig
>>> +++ b/fs/fscache/Kconfig
>>> @@ -38,3 +38,13 @@ config FSCACHE_DEBUG
>>>         enabled by setting bits in /sys/modules/fscache/parameter/debug.
>>>         See Documentation/filesystems/caching/fscache.rst for more 
>>> information.
>>> +
>>> +config FSCACHE_ASSERT
>>> +    bool "FSCACHE asserts"
>>> +    default n
>>> +    depends on FSCACHE
>>> +    help
>>> +      Support the ASSERT mode for failure behavior.
>>> +      Say N here to disable the ASSERT by default.
>>> +      Say Y to add assertion checks in some places. But the assertion
>>> +      failure will result in fatal errors that BUG() the kernel.
>>> diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
>>> index 1336f517e9b1..951166ed772f 100644
>>> --- a/fs/fscache/internal.h
>>> +++ b/fs/fscache/internal.h
>>> @@ -225,7 +225,7 @@ do {                        \
>>>   /*
>>>    * assertions
>>>    */
>>> -#if 1 /* defined(__KDEBUGALL) */
>>> +#ifdef CONFIG_FSCACHE_ASSERT
>>>   #define ASSERT(X)                            \
>>>   do {                                    \
>