linux-kernel - Re: [PATCH v4] mm: cma: support sysfs

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Message-ID: <YFSqYUfaxMajR/aq@kroah.com>
Date:   Fri, 19 Mar 2021 14:42:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, joaodias@...gle.com,
        willy@...radead.org, david@...hat.com, surenb@...gle.com,
        John Hubbard <jhubbard@...dia.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v4] mm: cma: support sysfs

On Fri, Mar 19, 2021 at 04:39:41PM +0300, Dmitry Osipenko wrote:
> 19.03.2021 15:44, Dmitry Osipenko пишет:
> ...
> >>  #include <linux/debugfs.h>
> >> +#include <linux/kobject.h>
> >> +
> >> +struct cma_stat {
> >> +	spinlock_t lock;
> >> +	/* the number of CMA page successful allocations */
> >> +	unsigned long nr_pages_succeeded;
> >> +	/* the number of CMA page allocation failures */
> >> +	unsigned long nr_pages_failed;
> >> +	struct kobject kobj;
> >> +};
> >>  
> >>  struct cma {
> >>  	unsigned long   base_pfn;
> >> @@ -16,6 +26,9 @@ struct cma {
> >>  	struct debugfs_u32_array dfs_bitmap;
> >>  #endif
> >>  	char name[CMA_MAX_NAME];
> >> +#ifdef CONFIG_CMA_SYSFS
> >> +	struct cma_stat	*stat;
> >> +#endif
> 
> What is the point of allocating stat dynamically?

Because static kobjects make me cry.