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authorLinus Torvalds <torvalds@linux-foundation.org>2018-07-21 13:48:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-07-21 13:48:51 -0700
commit3928d4f5ee37cdc523894f6e549e6aae521d8980 (patch)
treec328fd919e48fc8442db04d13c2ba1fe2c0f88e4 /include
parentMerge branch 'akpm' (patches from Andrew) (diff)
downloadlinux-dev-3928d4f5ee37cdc523894f6e549e6aae521d8980.tar.xz
linux-dev-3928d4f5ee37cdc523894f6e549e6aae521d8980.zip
mm: use helper functions for allocating and freeing vm_area structs
The vm_area_struct is one of the most fundamental memory management objects, but the management of it is entirely open-coded evertwhere, ranging from allocation and freeing (using kmem_cache_[z]alloc and kmem_cache_free) to initializing all the fields. We want to unify this in order to end up having some unified initialization of the vmas, and the first step to this is to at least have basic allocation functions. Right now those functions are literally just wrappers around the kmem_cache_*() calls. This is a purely mechanical conversion: # new vma: kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL) -> vm_area_alloc() # copy old vma kmem_cache_alloc(vm_area_cachep, GFP_KERNEL) -> vm_area_dup(old) # free vma kmem_cache_free(vm_area_cachep, vma) -> vm_area_free(vma) to the point where the old vma passed in to the vm_area_dup() function isn't even used yet (because I've left all the old manual initialization alone). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3982c83fdcbf..de2fd86c6154 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -155,7 +155,9 @@ extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
* mmap() functions).
*/
-extern struct kmem_cache *vm_area_cachep;
+struct vm_area_struct *vm_area_alloc(void);
+struct vm_area_struct *vm_area_dup(struct vm_area_struct *);
+void vm_area_free(struct vm_area_struct *);
#ifndef CONFIG_MMU
extern struct rb_root nommu_region_tree;