Re: [PATCH v4] mm: cma: support sysfs

[Minchan Kim]

On Fri, Mar 19, 2021 at 07:24:05PM +0300, Dmitry Osipenko wrote:
> 19.03.2021 18:50, Greg Kroah-Hartman пишет:
> >> Then initialization order won't be a problem.
> > I don't understand the problem here, what is wrong with the patch as-is?
> 
> The cma->stat is NULL at the time when CMA is used on ARM because
> cma->stat is initialized at the subsys level. This is the problem,
> apparently.

That's true.

> 
> > Also, watch out, if you only make the kobject dynamic, how are you going
> > to get backwards from the kobject to the values you want to send to
> > userspace in the show functions?
> 
> Still there should be a wrapper around the kobj with a back reference to
> the cma entry. If you're suggesting that I should write a patch, then I
> may take a look at it later on. Although, I assume that Minchan could
> just correct this patch and re-push it to -next.

This is ateempt to address it. Unless any objection, let me send it to
akpm.