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Message-ID: <20110720231746.GK9359@dastard>
Date: Thu, 21 Jul 2011 09:17:46 +1000
From: Dave Chinner <david@...morbit.com>
To: Al Viro <viro@...IV.linux.org.uk>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>,
linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
Dave Chinner <dchinner@...hat.com>,
"David S. Miller" <davem@...emloft.net>
Subject: Re: linux-next: build failure after merge of the final tree (maybe
vfs tree related)
On Wed, Jul 20, 2011 at 02:55:24PM +0100, Al Viro wrote:
> On Wed, Jul 20, 2011 at 05:32:32PM +1000, Stephen Rothwell wrote:
> > Hi all,
> >
> > After merging the final tree, today's linux-next build (sparc defconfig)
> > failed like this:
>
> > And many more similar. Again, I assume some include files changed.
> > Maybe commit 347727d3f51d ("superblock: introduce per-sb cache shrinker
> > infrastructure") which included linux/mm.h in linux/fs.h ...
> >
> > I have left this again.
>
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 1ce9086..e0569e4 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -395,7 +395,7 @@ struct inodes_stat_t {
> #include <linux/semaphore.h>
> #include <linux/fiemap.h>
> #include <linux/rculist_bl.h>
> -#include <linux/mm.h>
> +#include <linux/shrinker.h>
> #include <linux/atomic.h>
>
> #include <asm/byteorder.h>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 9b9777a..e3a1a9e 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -15,6 +15,7 @@
> #include <linux/range.h>
> #include <linux/pfn.h>
> #include <linux/bit_spinlock.h>
> +#include <linux/shrinker.h>
>
> struct mempolicy;
> struct anon_vma;
> @@ -1121,45 +1122,6 @@ static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
> }
> #endif
>
> -/*
> - * This struct is used to pass information from page reclaim to the shrinkers.
> - * We consolidate the values for easier extention later.
> - */
> -struct shrink_control {
> - gfp_t gfp_mask;
> -
> - /* How many slab objects shrinker() should scan and try to reclaim */
> - unsigned long nr_to_scan;
> -};
> -
> -/*
> - * A callback you can register to apply pressure to ageable caches.
> - *
> - * 'sc' is passed shrink_control which includes a count 'nr_to_scan'
> - * and a 'gfpmask'. It should look through the least-recently-used
> - * 'nr_to_scan' entries and attempt to free them up. It should return
> - * the number of objects which remain in the cache. If it returns -1, it means
> - * it cannot do any scanning at this time (eg. there is a risk of deadlock).
> - *
> - * The 'gfpmask' refers to the allocation we are currently trying to
> - * fulfil.
> - *
> - * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
> - * querying the cache size, so a fastpath for that case is appropriate.
> - */
> -struct shrinker {
> - int (*shrink)(struct shrinker *, struct shrink_control *sc);
> - int seeks; /* seeks to recreate an obj */
> - long batch; /* reclaim batch size, 0 = default */
> -
> - /* These are for internal use */
> - struct list_head list;
> - long nr; /* objs pending delete */
> -};
> -#define DEFAULT_SEEKS 2 /* A good number if you don't know better. */
> -extern void register_shrinker(struct shrinker *);
> -extern void unregister_shrinker(struct shrinker *);
> -
> int vma_wants_writenotify(struct vm_area_struct *vma);
>
> extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
> diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
> new file mode 100644
> index 0000000..790651b
> --- /dev/null
> +++ b/include/linux/shrinker.h
> @@ -0,0 +1,42 @@
> +#ifndef _LINUX_SHRINKER_H
> +#define _LINUX_SHRINKER_H
> +
> +/*
> + * This struct is used to pass information from page reclaim to the shrinkers.
> + * We consolidate the values for easier extention later.
> + */
> +struct shrink_control {
> + gfp_t gfp_mask;
> +
> + /* How many slab objects shrinker() should scan and try to reclaim */
> + unsigned long nr_to_scan;
> +};
> +
> +/*
> + * A callback you can register to apply pressure to ageable caches.
> + *
> + * 'sc' is passed shrink_control which includes a count 'nr_to_scan'
> + * and a 'gfpmask'. It should look through the least-recently-used
> + * 'nr_to_scan' entries and attempt to free them up. It should return
> + * the number of objects which remain in the cache. If it returns -1, it means
> + * it cannot do any scanning at this time (eg. there is a risk of deadlock).
> + *
> + * The 'gfpmask' refers to the allocation we are currently trying to
> + * fulfil.
> + *
> + * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
> + * querying the cache size, so a fastpath for that case is appropriate.
> + */
> +struct shrinker {
> + int (*shrink)(struct shrinker *, struct shrink_control *sc);
> + int seeks; /* seeks to recreate an obj */
> + long batch; /* reclaim batch size, 0 = default */
> +
> + /* These are for internal use */
> + struct list_head list;
> + long nr; /* objs pending delete */
> +};
> +#define DEFAULT_SEEKS 2 /* A good number if you don't know better. */
> +extern void register_shrinker(struct shrinker *);
> +extern void unregister_shrinker(struct shrinker *);
> +#endif
Yup, that was what I was considering doing to fix it. Thanks, Al.
Acked-by: Dave Chinner <dchinner@...hat.com>
--
Dave Chinner
david@...morbit.com
--
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