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Date: Mon, 19 Apr 2010 10:49:17 +0900
From: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To: Randy Dunlap <randy.dunlap@...cle.com>
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
linux-mm@...ck.org, Balbir Singh <balbir@...ux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: mmotm 2010-04-15-14-42 uploaded (shmem, CGROUP_MEM_RES_CTLR)
On Fri, 16 Apr 2010 09:03:15 -0700, Randy Dunlap <randy.dunlap@...cle.com> wrote:
> On Thu, 15 Apr 2010 14:42:59 -0700 akpm@...ux-foundation.org wrote:
>
> > The mm-of-the-moment snapshot 2010-04-15-14-42 has been uploaded to
> >
> > http://userweb.kernel.org/~akpm/mmotm/
> >
> > and will soon be available at
> >
> > git://zen-kernel.org/kernel/mmotm.git
> >
> > It contains the following patches against 2.6.34-rc4:
>
>
> memcg-move-charge-of-file-pages.patch:
>
> when CONFIG_SHMFS is not enabled:
>
> mm/shmem.c:2721: error: implicit declaration of function 'SHMEM_I'
> mm/shmem.c:2721: warning: initialization makes pointer from integer without a cast
> mm/shmem.c:2726: error: dereferencing pointer to incomplete type
> mm/shmem.c:2727: error: implicit declaration of function 'shmem_swp_entry'
> mm/shmem.c:2727: warning: assignment makes pointer from integer without a cast
> mm/shmem.c:2734: error: implicit declaration of function 'shmem_swp_unmap'
> mm/shmem.c:2735: error: dereferencing pointer to incomplete type
>
Thank you very much for your report.
I attach a fix patch.
===
From: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
build fix for !CONFIG_SHMEM case.
CC mm/shmem.o
mm/shmem.c: In function 'mem_cgroup_get_shmem_target':
mm/shmem.c:2721: error: implicit declaration of function 'SHMEM_I'
mm/shmem.c:2721: warning: initialization makes pointer from integer without a cast
mm/shmem.c:2726: error: dereferencing pointer to incomplete type
mm/shmem.c:2727: error: implicit declaration of function 'shmem_swp_entry'
mm/shmem.c:2727: warning: assignment makes pointer from integer without a cast
mm/shmem.c:2734: error: implicit declaration of function 'shmem_swp_unmap'
mm/shmem.c:2735: error: dereferencing pointer to incomplete type
make[1]: *** [mm/shmem.o] Error 1
Reported-by: Randy Dunlap <randy.dunlap@...cle.com>
Signed-off-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
---
mm/shmem.c | 99 +++++++++++++++++++++++++++++++++++++----------------------
1 files changed, 62 insertions(+), 37 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c
index cb87365..6f183ef 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2568,6 +2568,43 @@ out4:
return error;
}
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+/**
+ * mem_cgroup_get_shmem_target - find a page or entry assigned to the shmem file
+ * @inode: the inode to be searched
+ * @pgoff: the offset to be searched
+ * @pagep: the pointer for the found page to be stored
+ * @ent: the pointer for the found swap entry to be stored
+ *
+ * If a page is found, refcount of it is incremented. Callers should handle
+ * these refcount.
+ */
+void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
+ struct page **pagep, swp_entry_t *ent)
+{
+ swp_entry_t entry = { .val = 0 }, *ptr;
+ struct page *page = NULL;
+ struct shmem_inode_info *info = SHMEM_I(inode);
+
+ if ((pgoff << PAGE_CACHE_SHIFT) >= i_size_read(inode))
+ goto out;
+
+ spin_lock(&info->lock);
+ ptr = shmem_swp_entry(info, pgoff, NULL);
+ if (ptr && ptr->val) {
+ entry.val = ptr->val;
+ page = find_get_page(&swapper_space, entry.val);
+ } else
+ page = find_get_page(inode->i_mapping, pgoff);
+ if (ptr)
+ shmem_swp_unmap(ptr);
+ spin_unlock(&info->lock);
+out:
+ *pagep = page;
+ *ent = entry;
+}
+#endif
+
#else /* !CONFIG_SHMEM */
/*
@@ -2607,6 +2644,31 @@ int shmem_lock(struct file *file, int lock, struct user_struct *user)
return 0;
}
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+/**
+ * mem_cgroup_get_shmem_target - find a page or entry assigned to the shmem file
+ * @inode: the inode to be searched
+ * @pgoff: the offset to be searched
+ * @pagep: the pointer for the found page to be stored
+ * @ent: the pointer for the found swap entry to be stored
+ *
+ * If a page is found, refcount of it is incremented. Callers should handle
+ * these refcount.
+ */
+void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
+ struct page **pagep, swp_entry_t *ent)
+{
+ struct page *page = NULL;
+
+ if ((pgoff << PAGE_CACHE_SHIFT) >= i_size_read(inode))
+ goto out;
+ page = find_get_page(inode->i_mapping, pgoff);
+out:
+ *pagep = page;
+ *ent = (swp_entry_t){ .val = 0 };
+}
+#endif
+
#define shmem_vm_ops generic_file_vm_ops
#define shmem_file_operations ramfs_file_operations
#define shmem_get_inode(sb, mode, dev, flags) ramfs_get_inode(sb, mode, dev)
@@ -2701,40 +2763,3 @@ int shmem_zero_setup(struct vm_area_struct *vma)
vma->vm_ops = &shmem_vm_ops;
return 0;
}
-
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-/**
- * mem_cgroup_get_shmem_target - find a page or entry assigned to the shmem file
- * @inode: the inode to be searched
- * @pgoff: the offset to be searched
- * @pagep: the pointer for the found page to be stored
- * @ent: the pointer for the found swap entry to be stored
- *
- * If a page is found, refcount of it is incremented. Callers should handle
- * these refcount.
- */
-void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
- struct page **pagep, swp_entry_t *ent)
-{
- swp_entry_t entry = { .val = 0 }, *ptr;
- struct page *page = NULL;
- struct shmem_inode_info *info = SHMEM_I(inode);
-
- if ((pgoff << PAGE_CACHE_SHIFT) >= i_size_read(inode))
- goto out;
-
- spin_lock(&info->lock);
- ptr = shmem_swp_entry(info, pgoff, NULL);
- if (ptr && ptr->val) {
- entry.val = ptr->val;
- page = find_get_page(&swapper_space, entry.val);
- } else
- page = find_get_page(inode->i_mapping, pgoff);
- if (ptr)
- shmem_swp_unmap(ptr);
- spin_unlock(&info->lock);
-out:
- *pagep = page;
- *ent = entry;
-}
-#endif
--
1.5.6.1
--
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