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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Dan Nicolaescu <dann@HIDDEN>
Subject: Re: bug#6617: linux kernel C style (fwd)
References: <alpine.LNX.2.00.1007121306420.1500@HIDDEN>
<yxq4og3pxx6.fsf@HIDDEN>
Date: Wed, 08 Sep 2021 10:40:31 +0200
In-Reply-To: <yxq4og3pxx6.fsf@HIDDEN> (Dan Nicolaescu's message of
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Content preview: Dan Nicolaescu <dann@HIDDEN> writes: > Statements longer
than 80 columns will be broken into sensible > chunks. Descendants are always
substantially shorter than the parent > and are placed substantially to the
right. The same applies to [...]
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Dan Nicolaescu <dann@HIDDEN> writes:
> Statements longer than 80 columns will be broken into sensible
> chunks. Descendants are always substantially shorter than the parent
> and are placed substantially to the right. The same applies to
> function headers with a long argument list. Long strings are as well
> broken into shorter strings. The only exception to this is where
> exceeding 80 columns significantly increases readability and does not
> hide information.
>
> It is then followed by an example which is is indented only with tabs.
>
>> Looking at a random file in the linux-2.6.34.1 kernel:
>> kernel/sched.c one can see:
>>
>> static void update_group_shares_cpu(struct task_group *tg, int cpu,
>> unsigned long sd_shares,
>> unsigned long sd_rq_weight,
>> unsigned long *usd_rq_weight)
>> {
(I'm going through old bug reports that unfortunately weren't resolved
at the time.)
It still seems to be the case that the "linux" style indents using both
tabs and spaces in Emacs 28. I don't know what the Linux kernel style
is these days, but the suggestion in this bug report is to add a
tab-only variant. Alan, do you have any comments about this?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
bug-gnu-emacs@HIDDEN, bug-cc-mode@HIDDEN:bug#6617; Package emacs,cc-mode.
Full text available.
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To: Dimitrios Apostolou <jimis@HIDDEN>
Subject: Re: bug#6617: linux kernel C style (fwd)
References: <alpine.LNX.2.00.1007121306420.1500@HIDDEN>
<yxq4og3pxx6.fsf@HIDDEN>
<alpine.LNX.2.00.1007131202090.1500@HIDDEN>
From: Dan Nicolaescu <dann@HIDDEN>
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Date: Tue, 13 Jul 2010 08:51:30 -0400
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(Dimitrios Apostolou's message of "Tue\,
13 Jul 2010 12\:17\:38 +0300 \(EEST\)")
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Dimitrios Apostolou <jimis@HIDDEN> writes:
> On Tue, 13 Jul 2010, Dan Nicolaescu wrote:
>> Dimitrios Apostolou <jimis@HIDDEN> writes:
>>
>>> Hi, I sent the following to help-gnu-emacs and got no reply, maybe
>>> this list is more relevant.
>>>
>>> ---------- Forwarded message ----------
>>> Date: Thu, 8 Jul 2010 21:56:09 +0300 (EEST)
>>> From: Dimitrios Apostolou <jimis@HIDDEN>
>>> To: help-gnu-emacs@HIDDEN
>>> Subject: linux kernel C style
>>>
>>> Hello list,
>>>
>>> is the "linux" c-style supposed to be compliant to the linux kernel
>>> style guidelines? I just realised that all this time emacs was
>>> indenting my code slightly wrong, specifically the use of spaces is
>>> forbidden, even when continuing the argument list of a function.
>>
>> Is that really the case? Is this requirement documented anywhere?
>
> In the file Documentation/CodingStyle search for "emacs". Warning: the
> language is a bit toxic for emacs devs/users.
There's code there that seems to do what you stated, but there seems
to be no text that actually describes that...
> There is also another point which is not clear but says the following:
>
> Statements longer than 80 columns will be broken into sensible
> chunks. Descendants are always substantially shorter than the parent
> and are placed substantially to the right. The same applies to
> function headers with a long argument list. Long strings are as well
> broken into shorter strings. The only exception to this is where
> exceeding 80 columns significantly increases readability and does not
> hide information.
>
>
> It is then followed by an example which is is indented only with tabs.
>
>
>> Looking at a random file in the linux-2.6.34.1 kernel:
>> kernel/sched.c one can see:
>>
>> static void update_group_shares_cpu(struct task_group *tg, int cpu,
>> unsigned long sd_shares,
>> unsigned long sd_rq_weight,
>> unsigned long *usd_rq_weight)
>> {
>> [snip]
>>
>> The arguments starting from sd_shares are indented using a few tabs
>> followed by a few spaces.
>> The above is not the only occurrence, there are many others in the same file.
>
> My guess is that those are inconsistencies caused by the current
> "linux" style in emacs, but perhaps this should be posted to LKML to
> verify.
Please do that and report the conclusion here.
>> Another point: to enforce the use of the correct style, a file called
>> .dir-locals.el should be placed at the top level of the kernel tree
>> with the following [completely untested] contents:
>>
>> ((c-mode . ((c-file-style . "linux")
>> (tab-width . 8)
>> (indent-tabs-mode . t))))
>>
>> With this users of emacs-23+ will get the correct settings for editing
>> the kernel by default.
>>
>>
>
>
>
> Thanks,
> Dimitris
owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN, bug-cc-mode@HIDDEN:bug#6617; Package emacs,cc-mode.
Full text available.
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Date: Tue, 13 Jul 2010 12:17:38 +0300 (EEST)
From: Dimitrios Apostolou <jimis@HIDDEN>
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To: Dan Nicolaescu <dann@HIDDEN>
Subject: Re: bug#6617: linux kernel C style (fwd)
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On Tue, 13 Jul 2010, Dan Nicolaescu wrote:
> Dimitrios Apostolou <jimis@HIDDEN> writes:
>
>> Hi, I sent the following to help-gnu-emacs and got no reply, maybe
>> this list is more relevant.
>>
>> ---------- Forwarded message ----------
>> Date: Thu, 8 Jul 2010 21:56:09 +0300 (EEST)
>> From: Dimitrios Apostolou <jimis@HIDDEN>
>> To: help-gnu-emacs@HIDDEN
>> Subject: linux kernel C style
>>
>> Hello list,
>>
>> is the "linux" c-style supposed to be compliant to the linux kernel
>> style guidelines? I just realised that all this time emacs was
>> indenting my code slightly wrong, specifically the use of spaces is
>> forbidden, even when continuing the argument list of a function.
>
> Is that really the case? Is this requirement documented anywhere?
In the file Documentation/CodingStyle search for "emacs". Warning: the
language is a bit toxic for emacs devs/users.
There is also another point which is not clear but says the following:
Statements longer than 80 columns will be broken into sensible chunks.
Descendants are always substantially shorter than the parent and are
placed substantially to the right. The same applies to function headers
with a long argument list. Long strings are as well broken into shorter
strings. The only exception to this is where exceeding 80 columns
significantly increases readability and does not hide information.
It is then followed by an example which is is indented only with tabs.
> Looking at a random file in the linux-2.6.34.1 kernel: kernel/sched.c
> one can see:
>
> static void update_group_shares_cpu(struct task_group *tg, int cpu,
> unsigned long sd_shares,
> unsigned long sd_rq_weight,
> unsigned long *usd_rq_weight)
> {
> [snip]
>
> The arguments starting from sd_shares are indented using a few tabs
> followed by a few spaces.
> The above is not the only occurrence, there are many others in the same file.
My guess is that those are inconsistencies caused by the current "linux"
style in emacs, but perhaps this should be posted to LKML to verify.
>
>
> Another point: to enforce the use of the correct style, a file called
> .dir-locals.el should be placed at the top level of the kernel tree
> with the following [completely untested] contents:
>
> ((c-mode . ((c-file-style . "linux")
> (tab-width . 8)
> (indent-tabs-mode . t))))
>
> With this users of emacs-23+ will get the correct settings for editing
> the kernel by default.
>
>
Thanks,
Dimitris
owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN, bug-cc-mode@HIDDEN:bug#6617; Package emacs,cc-mode.
Full text available.
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To: Dimitrios Apostolou <jimis@HIDDEN>
Subject: Re: bug#6617: linux kernel C style (fwd)
References: <alpine.LNX.2.00.1007121306420.1500@HIDDEN>
From: Dan Nicolaescu <dann@HIDDEN>
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Date: Tue, 13 Jul 2010 04:51:17 -0400
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(Dimitrios Apostolou's message of "Mon\,
12 Jul 2010 13\:08\:42 +0300 \(EEST\)")
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Dimitrios Apostolou <jimis@HIDDEN> writes:
> Hi, I sent the following to help-gnu-emacs and got no reply, maybe
> this list is more relevant.
>
> ---------- Forwarded message ----------
> Date: Thu, 8 Jul 2010 21:56:09 +0300 (EEST)
> From: Dimitrios Apostolou <jimis@HIDDEN>
> To: help-gnu-emacs@HIDDEN
> Subject: linux kernel C style
>
> Hello list,
>
> is the "linux" c-style supposed to be compliant to the linux kernel
> style guidelines? I just realised that all this time emacs was
> indenting my code slightly wrong, specifically the use of spaces is
> forbidden, even when continuing the argument list of a function.
Is that really the case? Is this requirement documented anywhere?
Looking at a random file in the linux-2.6.34.1 kernel: kernel/sched.c
one can see:
static void update_group_shares_cpu(struct task_group *tg, int cpu,
unsigned long sd_shares,
unsigned long sd_rq_weight,
unsigned long *usd_rq_weight)
{
[snip]
The arguments starting from sd_shares are indented using a few tabs
followed by a few spaces.
The above is not the only occurrence, there are many others in the same file.
Another point: to enforce the use of the correct style, a file called
.dir-locals.el should be placed at the top level of the kernel tree
with the following [completely untested] contents:
((c-mode . ((c-file-style . "linux")
(tab-width . 8)
(indent-tabs-mode . t))))
With this users of emacs-23+ will get the correct settings for editing
the kernel by default.
owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN, bug-cc-mode@HIDDEN:bug#6617; Package emacs,cc-mode.
Full text available.
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Date: Mon, 12 Jul 2010 13:08:42 +0300 (EEST)
From: Dimitrios Apostolou <jimis@HIDDEN>
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To: bug-gnu-emacs@HIDDEN
Subject: linux kernel C style (fwd)
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Hi, I sent the following to help-gnu-emacs and got no reply, maybe this
list is more relevant.
---------- Forwarded message ----------
Date: Thu, 8 Jul 2010 21:56:09 +0300 (EEST)
From: Dimitrios Apostolou <jimis@HIDDEN>
To: help-gnu-emacs@HIDDEN
Subject: linux kernel C style
Hello list,
is the "linux" c-style supposed to be compliant to the linux kernel style
guidelines? I just realised that all this time emacs was indenting my code
slightly wrong, specifically the use of spaces is forbidden, even when
continuing the argument list of a function.
I use the following lines in my .emacs, taken from Documentation/CodingStyle of
the kernel tree. Perhaps they should be added to "linux" style?
(defun c-lineup-arglist-tabs-only (ignored)
"Line up argument lists by tabs, not spaces"
(let* ((anchor (c-langelem-pos c-syntactic-element))
(column (c-langelem-2nd-pos c-syntactic-element))
(offset (- (1+ column) anchor))
(steps (floor offset c-basic-offset)))
(* (max steps 1)
c-basic-offset)))
;; Add kernel style
(c-add-style
"linux-tabs-only"
'("linux" (c-offsets-alist
(arglist-cont-nonempty
c-lineup-gcc-asm-reg
c-lineup-arglist-tabs-only))))
(custom-set-variables
'(c-default-style "linux-tabs-only")
)
Thanks,
Dimitris
Dimitrios Apostolou <jimis@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:bug#6617; Package emacs.
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