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linux-next: build warning after merge of the block tree

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  linux-next: build warning after merge of the block tree Stephen Rothwell <sfr@canb.auug.org.au> - 2017-05-10 03:30 +0200
    Re: linux-next: build warning after merge of the block tree Markus Trippelsdorf <markus@trippelsdorf.de> - 2017-05-10 04:30 +0200
      Re: linux-next: build warning after merge of the block tree Jens Axboe <axboe@kernel.dk> - 2017-05-10 05:10 +0200
        Re: linux-next: build warning after merge of the block tree Markus Trippelsdorf <markus@trippelsdorf.de> - 2017-05-10 08:20 +0200
      Re: linux-next: build warning after merge of the block tree Stephen Rothwell <sfr@canb.auug.org.au> - 2017-05-10 05:30 +0200

#1638485 — linux-next: build warning after merge of the block tree

Hi Jens,

After merging the block tree, today's linux-next build (arm
multi_v7_defconfig) produced this warning:

block/elevator.c: In function 'elv_iosched_store':
block/elevator.c:1102:2: warning: ignoring return value of 'strstrip', declared with attribute warn_unused_result [-Wunused-result]
  strstrip(elevator_name);
  ^

Introduced by commit

  d0f6e2da5871 ("block: Remove leading whitespace and trailing newline in elevator switch error message")

-- 
Cheers,
Stephen Rothwell

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#1638499

On 2017.05.10 at 11:24 +1000, Stephen Rothwell wrote:
> Hi Jens,
> 
> After merging the block tree, today's linux-next build (arm
> multi_v7_defconfig) produced this warning:
> 
> block/elevator.c: In function 'elv_iosched_store':
> block/elevator.c:1102:2: warning: ignoring return value of 'strstrip', declared with attribute warn_unused_result [-Wunused-result]
>   strstrip(elevator_name);
>   ^
> 
> Introduced by commit
> 
>   d0f6e2da5871 ("block: Remove leading whitespace and trailing newline in elevator switch error message")

Yes, it was missing a (void) like "(void)strlcpy(...)". But Jens
unfortunately removed both warnings, so the following patch should now
be enough:

diff --git a/block/elevator.c b/block/elevator.c
index fda6be933130..dd0ed19e4fb7 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -1099,8 +1099,7 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name,
 		return count;
 
 	strlcpy(elevator_name, skip_spaces(name), sizeof(elevator_name));
-	strstrip(elevator_name);
-	ret = __elevator_change(q, elevator_name);
+	ret = __elevator_change(q, strstrip(elevator_name));
 	if (!ret)
 		return count;
 
-- 
Markus

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#1638520

On 05/09/2017 08:20 PM, Markus Trippelsdorf wrote:
> On 2017.05.10 at 11:24 +1000, Stephen Rothwell wrote:
>> Hi Jens,
>>
>> After merging the block tree, today's linux-next build (arm
>> multi_v7_defconfig) produced this warning:
>>
>> block/elevator.c: In function 'elv_iosched_store':
>> block/elevator.c:1102:2: warning: ignoring return value of 'strstrip', declared with attribute warn_unused_result [-Wunused-result]
>>   strstrip(elevator_name);
>>   ^
>>
>> Introduced by commit
>>
>>   d0f6e2da5871 ("block: Remove leading whitespace and trailing newline in elevator switch error message")
> 
> Yes, it was missing a (void) like "(void)strlcpy(...)". But Jens
> unfortunately removed both warnings, so the following patch should now
> be enough:
> 
> diff --git a/block/elevator.c b/block/elevator.c
> index fda6be933130..dd0ed19e4fb7 100644
> --- a/block/elevator.c
> +++ b/block/elevator.c
> @@ -1099,8 +1099,7 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name,
>  		return count;
>  
>  	strlcpy(elevator_name, skip_spaces(name), sizeof(elevator_name));
> -	strstrip(elevator_name);
> -	ret = __elevator_change(q, elevator_name);
> +	ret = __elevator_change(q, strstrip(elevator_name));
>  	if (!ret)
>  		return count;

Care to send that as a proper patch? I don't see that warning here, fwiw.

-- 
Jens Axboe

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#1638579

On 2017.05.09 at 21:00 -0600, Jens Axboe wrote:
> On 05/09/2017 08:20 PM, Markus Trippelsdorf wrote:
> > On 2017.05.10 at 11:24 +1000, Stephen Rothwell wrote:
> >> Hi Jens,
> >>
> >> After merging the block tree, today's linux-next build (arm
> >> multi_v7_defconfig) produced this warning:
> >>
> >> block/elevator.c: In function 'elv_iosched_store':
> >> block/elevator.c:1102:2: warning: ignoring return value of 'strstrip', declared with attribute warn_unused_result [-Wunused-result]
> >>   strstrip(elevator_name);
> >>   ^
> >>
> >> Introduced by commit
> >>
> >>   d0f6e2da5871 ("block: Remove leading whitespace and trailing newline in elevator switch error message")
> > 
> > Yes, it was missing a (void) like "(void)strlcpy(...)". But Jens
> > unfortunately removed both warnings, so the following patch should now
> > be enough:
> > 
> > diff --git a/block/elevator.c b/block/elevator.c
> > index fda6be933130..dd0ed19e4fb7 100644
> > --- a/block/elevator.c
> > +++ b/block/elevator.c
> > @@ -1099,8 +1099,7 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name,
> >  		return count;
> >  
> >  	strlcpy(elevator_name, skip_spaces(name), sizeof(elevator_name));
> > -	strstrip(elevator_name);
> > -	ret = __elevator_change(q, elevator_name);
> > +	ret = __elevator_change(q, strstrip(elevator_name));
> >  	if (!ret)
> >  		return count;
> 
> Care to send that as a proper patch? I don't see that warning here, fwiw.

I don't see it either. But no, I don't want to send a proper patch.
Please just drop my original patch (d0f6e2da5871), because its only
reason was to improve the two debug printks that you have removed later.

-- 
Markus

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#1638525

Hi Markus,

On Wed, 10 May 2017 04:20:54 +0200 Markus Trippelsdorf <markus@trippelsdorf.de> wrote:
>
> Yes, it was missing a (void) like "(void)strlcpy(...)". But Jens
> unfortunately removed both warnings, so the following patch should now
> be enough:
> 
> diff --git a/block/elevator.c b/block/elevator.c
> index fda6be933130..dd0ed19e4fb7 100644
> --- a/block/elevator.c
> +++ b/block/elevator.c
> @@ -1099,8 +1099,7 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name,
>  		return count;
>  
>  	strlcpy(elevator_name, skip_spaces(name), sizeof(elevator_name));
> -	strstrip(elevator_name);
> -	ret = __elevator_change(q, elevator_name);
> +	ret = __elevator_change(q, strstrip(elevator_name));
>  	if (!ret)
>  		return count;

I think you (or someone) needs to do a proper patch submission to Jens,
please.
-- 
Cheers,
Stephen Rothwell

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