[Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Aditya Srivastava]

Currently, checkpatch warns us if the author of the commit signs-off
as co-developed-by.
E.g. for commit 6e88559470f5 ("Documentation: Add section about
CPU vulnerabilities for Spectre") we get:

WARNING: Co-developed-by: should not be used to attribute nominal
patch author 'Tim Chen <tim.c.chen@linux.intel.com>'
Co-developed-by: Tim Chen <tim.c.chen@linux.intel.com>

Provide a simple fix by removing the co-developed-by line from the
commit message

Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
---
 scripts/checkpatch.pl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 58095d9d8f34..1030d4fc2abf 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2827,8 +2827,11 @@ sub process {
 # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
 			if ($sign_off =~ /^co-developed-by:$/i) {
 				if ($email eq $author) {
-					WARN("BAD_SIGN_OFF",
-					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
+					if (WARN("BAD_SIGN_OFF",
+						 "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline) &&
+					    $fix) {
+						fix_delete_line($fixlinenr, $rawline);
+					}
 				}
 				if (!defined $lines[$linenr]) {
 					WARN("BAD_SIGN_OFF",
-- 
2.17.1

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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Lukas Bulwahn]

On Tue, Nov 3, 2020 at 4:19 PM Aditya Srivastava <yashsri421@gmail.com> wrote:
>
> Currently, checkpatch warns us if the author of the commit signs-off
> as co-developed-by.
> E.g. for commit 6e88559470f5 ("Documentation: Add section about
> CPU vulnerabilities for Spectre") we get:
>
> WARNING: Co-developed-by: should not be used to attribute nominal
> patch author 'Tim Chen <tim.c.chen@linux.intel.com>'
> Co-developed-by: Tim Chen <tim.c.chen@linux.intel.com>
>
> Provide a simple fix by removing the co-developed-by line from the
> commit message
>

Patch looks good. Maybe you can add a statistics on how many cases of
the last 200,000 commits this rule would actually trigger?

E.g., you can probably quickly filter all commits that have at least
one Co-developed-by tag among those last 200,000 commits (that is
already only a few thousands), then take that list and just check with
checkpatch.pl for this one rule quickly to see how often the rule
would even trigger at all.

Once you have that and explain that in the commit message, I think the
patch is ready for lkml and Joe Perches.

Lukas

> Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
> ---
>  scripts/checkpatch.pl | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 58095d9d8f34..1030d4fc2abf 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2827,8 +2827,11 @@ sub process {
>  # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
>                         if ($sign_off =~ /^co-developed-by:$/i) {
>                                 if ($email eq $author) {
> -                                       WARN("BAD_SIGN_OFF",
> -                                             "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
> +                                       if (WARN("BAD_SIGN_OFF",
> +                                                "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline) &&
> +                                           $fix) {
> +                                               fix_delete_line($fixlinenr, $rawline);
> +                                       }
>                                 }
>                                 if (!defined $lines[$linenr]) {
>                                         WARN("BAD_SIGN_OFF",
> --
> 2.17.1
>
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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Aditya]

On 4/11/20 4:44 pm, Lukas Bulwahn wrote:
> On Tue, Nov 3, 2020 at 4:19 PM Aditya Srivastava <yashsri421@gmail.com> wrote:
>>
>> Currently, checkpatch warns us if the author of the commit signs-off
>> as co-developed-by.
>> E.g. for commit 6e88559470f5 ("Documentation: Add section about
>> CPU vulnerabilities for Spectre") we get:
>>
>> WARNING: Co-developed-by: should not be used to attribute nominal
>> patch author 'Tim Chen <tim.c.chen@linux.intel.com>'
>> Co-developed-by: Tim Chen <tim.c.chen@linux.intel.com>
>>
>> Provide a simple fix by removing the co-developed-by line from the
>> commit message
>>
> 
> Patch looks good. Maybe you can add a statistics on how many cases of
> the last 200,000 commits this rule would actually trigger?
> 
> E.g., you can probably quickly filter all commits that have at least
> one Co-developed-by tag among those last 200,000 commits (that is
> already only a few thousands), then take that list and just check with
> checkpatch.pl for this one rule quickly to see how often the rule
> would even trigger at all.
> 
> Once you have that and explain that in the commit message, I think the
> patch is ready for lkml and Joe Perches.
> 
> Lukas
> 

Hi Sir
I generated a report for around 200,000 commits (v4.13..v5.8), and
found that this rule was being triggered only 6 times. Statistically
this doesn't seem much. Is it still advisable to mention it in the
commit message?
Although, there's a possibility that user fixed this issue after
receiving the warning manually before committing.

Thanks
Aditya

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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Lukas Bulwahn]

[-- Attachment #1.1: Type: text/plain, Size: 1908 bytes --]

On Sa., 7. Nov. 2020 at 10:27, Aditya <yashsri421@gmail.com> wrote:

> On 4/11/20 4:44 pm, Lukas Bulwahn wrote:
> > On Tue, Nov 3, 2020 at 4:19 PM Aditya Srivastava <yashsri421@gmail.com>
> wrote:
> >>
> >> Currently, checkpatch warns us if the author of the commit signs-off
> >> as co-developed-by.
> >> E.g. for commit 6e88559470f5 ("Documentation: Add section about
> >> CPU vulnerabilities for Spectre") we get:
> >>
> >> WARNING: Co-developed-by: should not be used to attribute nominal
> >> patch author 'Tim Chen <tim.c.chen@linux.intel.com>'
> >> Co-developed-by: Tim Chen <tim.c.chen@linux.intel.com>
> >>
> >> Provide a simple fix by removing the co-developed-by line from the
> >> commit message
> >>
> >
> > Patch looks good. Maybe you can add a statistics on how many cases of
> > the last 200,000 commits this rule would actually trigger?
> >
> > E.g., you can probably quickly filter all commits that have at least
> > one Co-developed-by tag among those last 200,000 commits (that is
> > already only a few thousands), then take that list and just check with
> > checkpatch.pl for this one rule quickly to see how often the rule
> > would even trigger at all.
> >
> > Once you have that and explain that in the commit message, I think the
> > patch is ready for lkml and Joe Perches.
> >
> > Lukas
> >
>
> Hi Sir
> I generated a report for around 200,000 commits (v4.13..v5.8), and
> found that this rule was being triggered only 6 times. Statistically
> this doesn't seem much. Is it still advisable to mention it in the
> commit message?
> Although, there's a possibility that user fixed this issue after
> receiving the warning manually before committing.
>

Can you share the six commits?

Then we check if the fix is really the right fix of if something different
is wrong with these commits.

This certainly needs to be mentioned in the commit message.


Lukas


> Thanks
> Aditya
>
>

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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Aditya]

On 8/11/20 12:08 am, Lukas Bulwahn wrote:
> 
> Can you share the six commits?
> 
> Then we check if the fix is really the right fix of if something different
> is wrong with these commits.
> 


These are the commits where this warning for BAD_SIGN_OFF was getting
triggered(over 4.13..5.8):
1) Commit 1d1f898df658 ("rcu: Do RCU GP kthread self-wakeup from
softirq and interrupt")
2) Commit 6e88559470f5 ("Documentation: Add section about CPU
vulnerabilities for Spectre")
3) Commit a35d16905efc ("rcu: Add basic support for kfree_rcu() batching")
4) Commit b7e4aadef28f ("locking/spinlocks: Document the semantics of
spin_is_locked()")
5) Commit 621df431b0ac ("Documentation/memory-barriers.txt:
Cross-reference "tools/memory-model/"")
6) Commit 1c27b644c0fd ("Automate memory-barriers.txt; provide
Linux-kernel memory model")

> This certainly needs to be mentioned in the commit message.
>
Okay.


Thanks
Aditya

>
> Lukas
>
>
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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Lukas Bulwahn]

On Sun, 8 Nov 2020, Aditya wrote:

> On 8/11/20 12:08 am, Lukas Bulwahn wrote:
> > 
> > Can you share the six commits?
> > 
> > Then we check if the fix is really the right fix of if something different
> > is wrong with these commits.
> > 
> 
> 
> These are the commits where this warning for BAD_SIGN_OFF was getting
> triggered(over 4.13..5.8):
> 1) Commit 1d1f898df658 ("rcu: Do RCU GP kthread self-wakeup from
> softirq and interrupt")
> 2) Commit 6e88559470f5 ("Documentation: Add section about CPU
> vulnerabilities for Spectre")
> 3) Commit a35d16905efc ("rcu: Add basic support for kfree_rcu() batching")
> 4) Commit b7e4aadef28f ("locking/spinlocks: Document the semantics of
> spin_is_locked()")
> 5) Commit 621df431b0ac ("Documentation/memory-barriers.txt:
> Cross-reference "tools/memory-model/"")
> 6) Commit 1c27b644c0fd ("Automate memory-barriers.txt; provide
> Linux-kernel memory model")
>

I checked all six cases and think the proposed fix is always okay.

I guess there is still the warning that Co-developed-by: should 
immediately be followed up the Signed-off-by:, right?

A possible fix for that would be to check if the needed Signed-off-by: 
follows somewhere and then just move that to the appropriate place in the 
patch.

When your patch includes this information on how many occurrences, you 
found and that all of the fixes are correct in those cases, this patch is 
ready for lkml and Joe Perches.

Joe will possibly ask to name the six commits, so he can check himself. 
But no need to add them in the commit message or so.

Lukas

> > This certainly needs to be mentioned in the commit message.
> >
> Okay.
> 
> 
> Thanks
> Aditya
> 
> >
> > Lukas
> >
> >
> 
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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Aditya]

On 8/11/20 12:17 pm, Lukas Bulwahn wrote:
> 
> 
> On Sun, 8 Nov 2020, Aditya wrote:
> 
>> On 8/11/20 12:08 am, Lukas Bulwahn wrote:
>>>
>>> Can you share the six commits?
>>>
>>> Then we check if the fix is really the right fix of if something different
>>> is wrong with these commits.
>>>
>>
>>
>> These are the commits where this warning for BAD_SIGN_OFF was getting
>> triggered(over 4.13..5.8):
>> 1) Commit 1d1f898df658 ("rcu: Do RCU GP kthread self-wakeup from
>> softirq and interrupt")
>> 2) Commit 6e88559470f5 ("Documentation: Add section about CPU
>> vulnerabilities for Spectre")
>> 3) Commit a35d16905efc ("rcu: Add basic support for kfree_rcu() batching")
>> 4) Commit b7e4aadef28f ("locking/spinlocks: Document the semantics of
>> spin_is_locked()")
>> 5) Commit 621df431b0ac ("Documentation/memory-barriers.txt:
>> Cross-reference "tools/memory-model/"")
>> 6) Commit 1c27b644c0fd ("Automate memory-barriers.txt; provide
>> Linux-kernel memory model")
>>
> 
> I checked all six cases and think the proposed fix is always okay.
> 
> I guess there is still the warning that Co-developed-by: should 
> immediately be followed up the Signed-off-by:, right?
> 
> A possible fix for that would be to check if the needed Signed-off-by: 
> follows somewhere and then just move that to the appropriate place in the 
> patch.
> 

Should I add this in the current patch itself or create another patch
for it?

> When your patch includes this information on how many occurrences, you 
> found and that all of the fixes are correct in those cases, this patch is 
> ready for lkml and Joe Perches.
> 
> Joe will possibly ask to name the six commits, so he can check himself. 
> But no need to add them in the commit message or so.
> 
Okay.

Thanks
Aditya


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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Lukas Bulwahn]

[-- Attachment #1.1: Type: text/plain, Size: 1614 bytes --]

On So., 8. Nov. 2020 at 10:19, Aditya <yashsri421@gmail.com> wrote:

> On 8/11/20 12:17 pm, Lukas Bulwahn wrote:
> >
> >
> > On Sun, 8 Nov 2020, Aditya wrote:
> >
> >> On 8/11/20 12:08 am, Lukas Bulwahn wrote:
> >>>
> >>> Can you share the six commits?
> >>>
> >>> Then we check if the fix is really the right fix of if something
> different
> >>> is wrong with these commits.
> >>>
> >>
> >>
> >> These are the commits where this warning for BAD_SIGN_OFF was getting
> >> triggered(over 4.13..5.8):
> >> 1) Commit 1d1f898df658 ("rcu: Do RCU GP kthread self-wakeup from
> >> softirq and interrupt")
> >> 2) Commit 6e88559470f5 ("Documentation: Add section about CPU
> >> vulnerabilities for Spectre")
> >> 3) Commit a35d16905efc ("rcu: Add basic support for kfree_rcu()
> batching")
> >> 4) Commit b7e4aadef28f ("locking/spinlocks: Document the semantics of
> >> spin_is_locked()")
> >> 5) Commit 621df431b0ac ("Documentation/memory-barriers.txt:
> >> Cross-reference "tools/memory-model/"")
> >> 6) Commit 1c27b644c0fd ("Automate memory-barriers.txt; provide
> >> Linux-kernel memory model")
> >>
> >
> > I checked all six cases and think the proposed fix is always okay.
> >
> > I guess there is still the warning that Co-developed-by: should
> > immediately be followed up the Signed-off-by:, right?
> >
> > A possible fix for that would be to check if the needed Signed-off-by:
> > follows somewhere and then just move that to the appropriate place in
> the
> > patch.
> >
>
> Should I add this in the current patch itself or create another patch
> for it?
>

Make that further fix feature a new patch.

Lukas

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[Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Aditya Srivastava]

Currently, checkpatch warns us if the author of the commit signs-off
as co-developed-by.
E.g. for commit 6e88559470f5 ("Documentation: Add section about
CPU vulnerabilities for Spectre") we get:

WARNING: Co-developed-by: should not be used to attribute nominal
patch author 'Tim Chen <tim.c.chen@linux.intel.com>'
Co-developed-by: Tim Chen <tim.c.chen@linux.intel.com>

Provide a simple fix by removing the co-developed-by line from the
commit message

A quick evaluation on v4.13..v5.8 showed that this fix was getting
triggered 6 times.
A quick manual check found out that all fixes were correct in those
cases.

Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
---
 scripts/checkpatch.pl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 58095d9d8f34..1030d4fc2abf 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2827,8 +2827,11 @@ sub process {
 # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
 			if ($sign_off =~ /^co-developed-by:$/i) {
 				if ($email eq $author) {
-					WARN("BAD_SIGN_OFF",
-					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
+					if (WARN("BAD_SIGN_OFF",
+						 "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline) &&
+					    $fix) {
+						fix_delete_line($fixlinenr, $rawline);
+					}
 				}
 				if (!defined $lines[$linenr]) {
 					WARN("BAD_SIGN_OFF",
-- 
2.17.1

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[Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Aditya Srivastava]

Currently, checkpatch warns us if the author of the commit signs-off
as co-developed-by.
E.g. for commit 6e88559470f5 ("Documentation: Add section about
CPU vulnerabilities for Spectre") we get:

WARNING: Co-developed-by: should not be used to attribute nominal
patch author 'Tim Chen <tim.c.chen@linux.intel.com>'
Co-developed-by: Tim Chen <tim.c.chen@linux.intel.com>

Provide a simple fix by removing the co-developed-by line from the
commit message

A quick evaluation on v4.13..v5.8 showed that this fix was getting
triggered 6 times.
A quick manual check found out that all fixes were correct in those
cases.

Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
---
 scripts/checkpatch.pl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 58095d9d8f34..1030d4fc2abf 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2827,8 +2827,11 @@ sub process {
 # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
 			if ($sign_off =~ /^co-developed-by:$/i) {
 				if ($email eq $author) {
-					WARN("BAD_SIGN_OFF",
-					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
+					if (WARN("BAD_SIGN_OFF",
+						 "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline) &&
+					    $fix) {
+						fix_delete_line($fixlinenr, $rawline);
+					}
 				}
 				if (!defined $lines[$linenr]) {
 					WARN("BAD_SIGN_OFF",
-- 
2.17.1

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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Joe Perches]

On Sun, 2020-11-08 at 19:13 +0530, Aditya Srivastava wrote:
> Currently, checkpatch warns us if the author of the commit signs-off
> as co-developed-by.
[]
> A quick manual check found out that all fixes were correct in those
> cases.
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -2827,8 +2827,11 @@ sub process {
>  # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
>  			if ($sign_off =~ /^co-developed-by:$/i) {
>  				if ($email eq $author) {
> -					WARN("BAD_SIGN_OFF",
> -					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
> +					if (WARN("BAD_SIGN_OFF",
> +						 "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline) &&
> +					    $fix) {
> +						fix_delete_line($fixlinenr, $rawline);
> +					}
>  				}
>  				if (!defined $lines[$linenr]) {
>  					WARN("BAD_SIGN_OFF",

Looks OK to me.

Another option might be to add a Signed-off-by: line derived from
any "From:" line when:

	if ($is_patch && $has_commit_log && $chk_signoff) {
		if ($signoff == 0) {
			ERROR("MISSING_SIGN_OFF",
			      "Missing Signed-off-by: line(s)\n");

etc...

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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Aditya]

On 9/11/20 1:27 am, Joe Perches wrote:
> On Sun, 2020-11-08 at 19:13 +0530, Aditya Srivastava wrote:
>> Currently, checkpatch warns us if the author of the commit signs-off
>> as co-developed-by.
> []
>> A quick manual check found out that all fixes were correct in those
>> cases.
> []
>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
>> @@ -2827,8 +2827,11 @@ sub process {
>>  # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
>>  			if ($sign_off =~ /^co-developed-by:$/i) {
>>  				if ($email eq $author) {
>> -					WARN("BAD_SIGN_OFF",
>> -					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
>> +					if (WARN("BAD_SIGN_OFF",
>> +						 "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline) &&
>> +					    $fix) {
>> +						fix_delete_line($fixlinenr, $rawline);
>> +					}
>>  				}
>>  				if (!defined $lines[$linenr]) {
>>  					WARN("BAD_SIGN_OFF",
> 
> Looks OK to me.
> 
> Another option might be to add a Signed-off-by: line derived from
> any "From:" line when:
> 
> 	if ($is_patch && $has_commit_log && $chk_signoff) {
> 		if ($signoff == 0) {
> 			ERROR("MISSING_SIGN_OFF",
> 			      "Missing Signed-off-by: line(s)\n");
> 
> etc...
> 

Yes, I just noticed. Thanks for the suggestion. Will do.

Thanks
Aditya
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Re: [Linux-kernel-mentees] [PATCH] checkpatch: add fix for BAD_SIGN_OFF

[Aditya]

On 9/11/20 1:27 am, Joe Perches wrote:
> On Sun, 2020-11-08 at 19:13 +0530, Aditya Srivastava wrote:
>> Currently, checkpatch warns us if the author of the commit signs-off
>> as co-developed-by.
> []
>> A quick manual check found out that all fixes were correct in those
>> cases.
> []
>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
>> @@ -2827,8 +2827,11 @@ sub process {
>>  # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
>>  			if ($sign_off =~ /^co-developed-by:$/i) {
>>  				if ($email eq $author) {
>> -					WARN("BAD_SIGN_OFF",
>> -					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
>> +					if (WARN("BAD_SIGN_OFF",
>> +						 "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline) &&
>> +					    $fix) {
>> +						fix_delete_line($fixlinenr, $rawline);
>> +					}
>>  				}
>>  				if (!defined $lines[$linenr]) {
>>  					WARN("BAD_SIGN_OFF",
> 
> Looks OK to me.
> 
> Another option might be to add a Signed-off-by: line derived from
> any "From:" line when:
> 
> 	if ($is_patch && $has_commit_log && $chk_signoff) {
> 		if ($signoff == 0) {
> 			ERROR("MISSING_SIGN_OFF",
> 			      "Missing Signed-off-by: line(s)\n");
> 
> etc...
> 

Hi Joe

You probably forgot to Ack this patch.

Thanks
Aditya
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