On Sat, May 10, 2025 at 07:56:03PM +0100, David Laight wrote:
> On Fri, 9 May 2025 23:34:29 +0300
> Alexey Dobriyan <[email protected]> wrote:
>
> > Signed-off-by: Alexey Dobriyan <[email protected]>
> > ---
> > Documentation/process/coding-style.rst | 16 +++++++++++++++-
> > 1 file changed, 15 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/process/coding-style.rst
> > b/Documentation/process/coding-style.rst
> > index e17de69845ff..494ab3201112 100644
> > --- a/Documentation/process/coding-style.rst
> > +++ b/Documentation/process/coding-style.rst
> > @@ -183,7 +183,21 @@ Descendants are always substantially shorter than the
> > parent and
> > are placed substantially to the right. A very commonly used style
> > is to align descendants to a function open parenthesis.
> >
> > -These same rules are applied to function headers with a long argument list.
> > +These same rules are applied to function prototypes with a long argument
> > list.
> > +
> > +Very long ``for`` loops are split at the ``;`` characters making it easier
> > +to see which code goes to which clause:
> > +
> > +.. code-block:: c
> > +
> > + for (int i = 0;
> > + i < N;
> > + i += 1)
> > + {
> > + }
> > +
> > +Opening curly is placed on a separate line then to make it easier to tell
> > +loop body from iteration clause.
>
> Is that actually the style - I don't remember seeing it.
Check include/linux/list.h.
The point here is that it is either 1 line or 3 (not 2).
If you start splitting for loop there are 2 obvious points to do so.
> The location of the { isn't a significant problem with for (;;), it can be
> much worse elsewhere.
> In reality the 'align with the (' is what causes the problems, either
> double indenting (two tabs) or half indent (4 spaces - to annoy anyone who
> sets an editor to 4 space tabs) is more readable.
>
> For for (;;) loops I'll normally try moving the initialisation outside the
> loop
That's slightly bad -- variables could leak outside.
> and even put an inverted condition inside the loop to avoid long lines.
> If a #define all bets are off :-)
It applies even more inside #define: #define shits everything by 1 indent
usually
so more chance of split line,
it is harder tom see semicolons because macro body is usually colored in
1 color not the normal way.
Do you like how xas_for_each() look like?
"for" macros in include/linux/list.h look mostly OK.
