From: Aditya <yashsri421@gmail.com>
To: Joe Perches <joe@perches.com>
Cc: linux-kernel-mentees@lists.linuxfoundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [Linux-kernel-mentees] [PATCH v3] checkpatch: add fix option for ASSIGNMENT_CONTINUATIONS
Date: Fri, 20 Nov 2020 23:32:16 +0530 [thread overview]
Message-ID: <6deacf63-a80f-67b5-0594-e5cb5e82f42b@gmail.com> (raw)
In-Reply-To: <08f164e93dc40e066e81c4021485d27d5ad5a6b7.camel@perches.com>
On 20/11/20 10:56 pm, Joe Perches wrote:
> On Fri, 2020-11-20 at 16:11 +0530, Aditya wrote:
>> On 17/11/20 10:48 pm, Aditya Srivastava wrote:
>>> Currently, checkpatch warns us if an assignment operator is placed
>>> at the start of a line and not at the end of previous line.
>>>
>>> E.g., running checkpatch on commit 8195b1396ec8 ("hv_netvsc: fix
>>> deadlock on hotplug") reports:
>>>
>>> CHECK: Assignment operator '=' should be on the previous line
>>> + struct netvsc_device *nvdev
>>> + = container_of(w, struct netvsc_device, subchan_work);
>>>
>>> Provide a simple fix by appending assignment operator to the previous
>>> line and removing from the current line, if both the lines are additions
>>> (ie start with '+')
>>>
>>> Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
>>> ---
>>> Changes in v2:
>>> add check if both the lines are additions (ie start with '+')
>>>
>>> Changes in v3:
>>> quote $operator; test with division assignment operator ('/=')
>>>
>>> scripts/checkpatch.pl | 10 ++++++++--
>>> 1 file changed, 8 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
>>> index c9aaaa443265..d5bc4d8e4f6c 100755
>>> --- a/scripts/checkpatch.pl
>>> +++ b/scripts/checkpatch.pl
>>> @@ -3542,8 +3542,14 @@ sub process {
>>>
>>>
>>> # check for assignments on the start of a line
>>> if ($sline =~ /^\+\s+($Assignment)[^=]/) {
>>> - CHK("ASSIGNMENT_CONTINUATIONS",
>>> - "Assignment operator '$1' should be on the previous line\n" . $hereprev);
>>> + my $operator = "$1";
>>> + if (CHK("ASSIGNMENT_CONTINUATIONS",
>>> + "Assignment operator '$1' should be on the previous line\n" . $hereprev) &&
>>> + $fix && $prevrawline =~ /^\+/) {
>>> + # add assignment operator to the previous line, remove from current line
>>> + $fixed[$fixlinenr - 1] .= " $operator";
>>> + $fixed[$fixlinenr] =~ s/$operator\s*//;
>>> + }
>>> }
>>>
>>>
>>> # check for && or || at the start of a line
>>>
>>
>> Hi Joe
>> This patch probably got missed. Please review :)
>
> Did you look at $Assignment? Did you see it can be /= ?
>
Yes, I tested the patch with '/=' operator as well.
As I could not find any occurrences in the past(over 4.13..5.8), I
created an example for myself by modifying the above mentioned commit
example i.e. commit 8195b1396ec8 ("hv_netvsc: fix deadlock on
hotplug") as:
+ struct netvsc_device *nvdev
+ /= container_of(w, struct netvsc_device, subchan_work);
[For Line 144 and 145(where the warning was reported for '=' earlier)]
The fix changes these lines to:
+ struct netvsc_device *nvdev /=
+ container_of(w, struct netvsc_device, subchan_work);
On retesting the patch with checkpatch.pl, it did not give this CHECK,
nor did we add any new warning/error.
> If it is, what happens in the $fixed[$fixlinenr] line?
>
In $fixed[$fixlinenr], we are just getting rid of the operator and any
space(s) following it.
What do you think?
Thanks
Aditya
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next prev parent reply other threads:[~2020-11-20 18:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-17 17:18 [Linux-kernel-mentees] [PATCH v3] checkpatch: add fix option for ASSIGNMENT_CONTINUATIONS Aditya Srivastava
2020-11-20 10:41 ` Aditya
2020-11-20 17:26 ` Joe Perches
2020-11-20 18:02 ` Aditya [this message]
2020-11-21 11:50 ` Aditya
2020-11-21 12:04 ` [Linux-kernel-mentees] [PATCH v4] " Aditya Srivastava
2020-11-21 12:10 ` Joe Perches
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