linux-kernel - Re: [PATCH 12/15] kconfig: sort found symbols by relevance

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Message-ID: <20130710204648.GE3297@free.fr>
Date:	Wed, 10 Jul 2013 22:46:48 +0200
From:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
To:	Jean Delvare <jdelvare@...e.de>, Michal Marek <mmarek@...e.cz>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	Roland Eggner <edvx1@...temanalysen.net>,
	Wang YanQing <udknight@...il.com>
Subject: Re: [PATCH 12/15] kconfig: sort found symbols by relevance

Michal, All,

On 2013-07-08 19:35 +0200, Yann E. MORIN spake thusly:
> On 2013-07-08 13:19 +0200, Jean Delvare spake thusly:
> > Le Monday 24 June 2013 à 20:11 +0200, Yann E. MORIN a écrit :
> > > From: "Yann E. MORIN" <yann.morin.1998@...e.fr>
> [--SNIP--]
> > > Since the search can be a regexp, it is possible that more than one symbol
> > > matches exactly. In this case, we can't decide which to sort first, so we
> > > fallback to alphabeticall sort.
[--SNIP--]
> > > Reported-by: Jean Delvare <jdelvare@...e.de>
> > > Signed-off-by: "Yann E. MORIN" <yann.morin.1998@...e.fr>
> > > Cc: Jean Delvare <jdelvare@...e.de>
> > > Cc: Michal Marek <mmarek@...e.cz>
> > > Cc: Roland Eggner <edvx1@...temanalysen.net>
> > > Cc: Wang YanQing <udknight@...il.com>
> > 
> > I tested it and it works fine, thanks!
> > 
> > Tested-by: Jean Delvare <jdelvare@...e.de>
> > 
> > Now comes my late review. Overall I like the idea and the code but a few
> > things could be improved:
> 
> Since this is already in Michal's tree, on should I proceed?
>   - send an updated patch that replaces that one, or
>   - send another additional patch with your proposed changes?

OK, since Michal already sent his pull-request to Linus, I'll prepare a
corrective patch I'll submit before the end of the week. Is that OK with
you, Michal?

[--SNIP--]
> > > +static int sym_rel_comp( const void *sym1, const void *sym2 )
> > > +{
> > > +	struct sym_match *s1 = *(struct sym_match **)sym1;
> > > +	struct sym_match *s2 = *(struct sym_match **)sym2;
> > 
> > You shouldn't need these casts.
> 
> Probably not, indeed, but I like to write (and read) what I expect to
> happen, and pointer arithmetics is always something I dread to foobar.

In fact, we need the cast, otherwise gcc whines about const/non-const.

[--SNIP--]
> > >  	for_all_symbols(i, sym) {
> > > +		struct sym_match *tmp_sym_match;
> > >  		if (sym->flags & SYMBOL_CONST || !sym->name)
> > >  			continue;
> > > -		if (regexec(&re, sym->name, 0, NULL, 0))
> > > +		if (regexec(&re, sym->name, 1, match, 0))
> > >  			continue;
> > >  		if (cnt + 1 >= size) {
> > 
> > I think the "+ 1" can be dropped because the new array is not
> > NULL-terminated.

Indeed.

> > > +			sym_match_arr = tmp;
> > >  		}
> > >  		sym_calc_value(sym);
> > > -		sym_arr[cnt++] = sym;
> > > +		tmp_sym_match = (struct sym_match*)malloc(sizeof(struct sym_match));
> > 
> > Cast not needed.
> 
> OK.
> 
> > In fact I don't think this allocation is needed in the first place.
> > Calling malloc for every match is rather costly. If you would have
> > allocated an array of struct sym_match (rather than only pointers
> > thereto) before, you would not need this per-symbol malloc. Struct
> > sym_match is small enough to not warrant an extra level of allocation
> > and indirection IMHO.

Indeed, it makes for cleaner code.

Thank you again! :-)

Regards,
Yann E. MORIN.

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