* [PATCH -next] blk-mq: Use BUG_ON() instead of BUG()
@ 2020-04-29 2:10 Zou Wei
2020-04-29 7:26 ` Christoph Hellwig
0 siblings, 1 reply; 3+ messages in thread
From: Zou Wei @ 2020-04-29 2:10 UTC (permalink / raw)
To: axboe; +Cc: linux-block, linux-kernel, Zou Wei
Fixes coccicheck warning:
block/blk-mq.c:546:2-5: WARNING: Use BUG_ON instead of if condition followed by BUG.
Fixes: 63151a449eba ("blk-mq: allow drivers to hook into I/O completion")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
---
block/blk-mq.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index bcc3a23..49a227e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -542,8 +542,7 @@ EXPORT_SYMBOL(__blk_mq_end_request);
void blk_mq_end_request(struct request *rq, blk_status_t error)
{
- if (blk_update_request(rq, error, blk_rq_bytes(rq)))
- BUG();
+ BUG_ON(blk_update_request(rq, error, blk_rq_bytes(rq)));
__blk_mq_end_request(rq, error);
}
EXPORT_SYMBOL(blk_mq_end_request);
--
2.6.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH -next] blk-mq: Use BUG_ON() instead of BUG()
2020-04-29 2:10 [PATCH -next] blk-mq: Use BUG_ON() instead of BUG() Zou Wei
@ 2020-04-29 7:26 ` Christoph Hellwig
2020-04-29 15:15 ` Jens Axboe
0 siblings, 1 reply; 3+ messages in thread
From: Christoph Hellwig @ 2020-04-29 7:26 UTC (permalink / raw)
To: Zou Wei; +Cc: axboe, linux-block, linux-kernel
On Wed, Apr 29, 2020 at 10:10:24AM +0800, Zou Wei wrote:
> Fixes coccicheck warning:
>
> block/blk-mq.c:546:2-5: WARNING: Use BUG_ON instead of if condition followed by BUG.
>
> Fixes: 63151a449eba ("blk-mq: allow drivers to hook into I/O completion")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Zou Wei <zou_wei@huawei.com>
> ---
> block/blk-mq.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index bcc3a23..49a227e 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -542,8 +542,7 @@ EXPORT_SYMBOL(__blk_mq_end_request);
>
> void blk_mq_end_request(struct request *rq, blk_status_t error)
> {
> - if (blk_update_request(rq, error, blk_rq_bytes(rq)))
> - BUG();
> + BUG_ON(blk_update_request(rq, error, blk_rq_bytes(rq)));
I don't think hiding something that actually does do the work in a
BUG_ON ever is a good style.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH -next] blk-mq: Use BUG_ON() instead of BUG()
2020-04-29 7:26 ` Christoph Hellwig
@ 2020-04-29 15:15 ` Jens Axboe
0 siblings, 0 replies; 3+ messages in thread
From: Jens Axboe @ 2020-04-29 15:15 UTC (permalink / raw)
To: Christoph Hellwig, Zou Wei; +Cc: linux-block, linux-kernel
On 4/29/20 1:26 AM, Christoph Hellwig wrote:
> On Wed, Apr 29, 2020 at 10:10:24AM +0800, Zou Wei wrote:
>> Fixes coccicheck warning:
>>
>> block/blk-mq.c:546:2-5: WARNING: Use BUG_ON instead of if condition followed by BUG.
>>
>> Fixes: 63151a449eba ("blk-mq: allow drivers to hook into I/O completion")
>> Reported-by: Hulk Robot <hulkci@huawei.com>
>> Signed-off-by: Zou Wei <zou_wei@huawei.com>
>> ---
>> block/blk-mq.c | 3 +--
>> 1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/block/blk-mq.c b/block/blk-mq.c
>> index bcc3a23..49a227e 100644
>> --- a/block/blk-mq.c
>> +++ b/block/blk-mq.c
>> @@ -542,8 +542,7 @@ EXPORT_SYMBOL(__blk_mq_end_request);
>>
>> void blk_mq_end_request(struct request *rq, blk_status_t error)
>> {
>> - if (blk_update_request(rq, error, blk_rq_bytes(rq)))
>> - BUG();
>> + BUG_ON(blk_update_request(rq, error, blk_rq_bytes(rq)));
>
> I don't think hiding something that actually does do the work in a
> BUG_ON ever is a good style.
Agree, it's a lot less readable. And, not that we've ever done that, but
also fragile in a lot of code bases where a non-debug build would turn
off the BUG_ON() equivalent, and hence never call blk_update_request().
So not a good practice anywhere for statements that have side effects.
--
Jens Axboe
^ permalink raw reply [flat|nested] 3+ messages in thread
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