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[PATCH] mm: fix oom roll-back of __vmalloc_area_node 

__vunmap must not rely on area->nr_pages when picking the release methode
for area->pages.  It may be too small when __vmalloc_area_node failed early
due to lacking memory.  Instead, use a flag in vmstruct to differentiate.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Jan Kiszka 2006-07-14 00:23:56 -07:00 committed by Linus Torvalds
parent e322fedf0c
commit 8757d5fa6b
2 changed files with 5 additions and 3 deletions
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1
include/linux/vmalloc.h
View File

@ -11,6 +11,7 @@ struct vm_area_struct;
#define VM_ALLOC 0x00000002 /* vmalloc() */
#define VM_MAP 0x00000004 /* vmap()ed pages */
#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
#define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
/* bits [20..32] reserved for arch specific ioremap internals */
/*

7
mm/vmalloc.c
View File

@ -340,7 +340,7 @@ void __vunmap(void *addr, int deallocate_pages)
__free_page(area->pages[i]);
}
if (area->nr_pages > PAGE_SIZE/sizeof(struct page *))
if (area->flags & VM_VPAGES)
vfree(area->pages);
else
kfree(area->pages);
@ -427,9 +427,10 @@ void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
area->nr_pages = nr_pages;
/* Please note that the recursion is strictly bounded. */
if (array_size > PAGE_SIZE)
if (array_size > PAGE_SIZE) {
pages = __vmalloc_node(array_size, gfp_mask, PAGE_KERNEL, node);
else
area->flags |= VM_VPAGES;
} else
pages = kmalloc_node(array_size, (gfp_mask & ~__GFP_HIGHMEM), node);
area->pages = pages;
if (!area->pages) {