Re: [PATCH v4 1/2] mm: add kstrimdup function

From: Pavel Machek
Date: Fri Jan 31 2014 - 07:24:59 EST


Hi!

On Fri 2014-01-31 02:46:08, David Rientjes wrote:
> On Fri, 31 Jan 2014, Pavel Machek wrote:
>
> > > kstrimdup will duplicate and trim spaces from the passed in
> > > null terminated string. This is useful for strings coming from
> > > sysfs that often include trailing whitespace due to user input.
> >
> > Is it good idea? I mean "\n\n/foo bar baz" is valid filename in
> > unix. This is kernel interface, it is not meant to be too user
> > friendly...
>
> v6 of this patchset carries your ack of the patch that uses this for
> /sys/debug/resume, so are you disagreeing we need this support at
> all or

/sys/power/resume, no?


> that it shouldn't be the generic sysfs write behavior? If the latter, I
> agree, and the changelog could be improved to specify what writes we
> actually care about.

Well, your /sys/power/resume patch would be nice cleanup, but it
changs behaviour, too... which is unnice. Stripping trailing "\n" is
probably neccessary, because we did it before. (It probably was a
mistake). But kernel is not right place to second-guess what the user
meant. Just return -EINVAL. This is kernel ABI, after all, not user
facing shell.

Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/