[PATCHv2 2/4] mm: vmalloc: export find_vm_area() function
From: m.szyprowski@samsung.com (Marek Szyprowski)
Date: 2012-05-17 10:56:33
Also in:
linux-mm, lkml
Subsystem:
memory management, the rest, vmalloc · Maintainers:
Andrew Morton, Linus Torvalds, Uladzislau Rezki
find_vm_area() function is usefull for other core subsystems (like dma-mapping) to get access to vm_area internals. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com> --- include/linux/vmalloc.h | 1 + mm/vmalloc.c | 10 +++++++++- 2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 2e28f4d..6071e91 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h@@ -93,6 +93,7 @@ extern struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long start, unsigned long end, const void *caller); extern struct vm_struct *remove_vm_area(const void *addr); +extern struct vm_struct *find_vm_area(const void *addr); extern int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 8bc7f3ef..8cb7f22 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c@@ -1402,7 +1402,15 @@ struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags, -1, GFP_KERNEL, caller); } -static struct vm_struct *find_vm_area(const void *addr) +/** + * find_vm_area - find a continuous kernel virtual area + * @addr: base address + * + * Search for the kernel VM area starting at @addr, and return it. + * It is up to the caller to do all required locking to keep the returned + * pointer valid. + */ +struct vm_struct *find_vm_area(const void *addr) { struct vmap_area *va;
--
1.7.10.1