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mm: make is_vmalloc_addr work properly.

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There was a typo in the config guard for CONFIG_ENABLE_VMALLOC_SAVING
which meant that the code was never actually being compiled. As a
result, it was never noticed that the code had major flaws. Fix
the code to actually work as intended.

Change-Id: Ief3c00d16cf54e3b945ffb1bfde6b1fea2fa142e
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
This commit is contained in:
Laura Abbott 2013-11-11 17:25:33 -08:00
parent cb544cb068
commit acce1041cd
1 changed files with 42 additions and 31 deletions
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73
mm/vmalloc.c
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@ -204,36 +204,6 @@ static int vmap_page_range(unsigned long start, unsigned long end,
return ret;
}
#ifdef ENABLE_VMALLOC_SAVING
int is_vmalloc_addr(const void *x)
{
struct rb_node *n;
struct vmap_area *va;
int ret = 0;
spin_lock(&vmap_area_lock);
for (n = rb_first(vmap_area_root); n; rb_next(n)) {
va = rb_entry(n, struct vmap_area, rb_node);
if (x >= va->va_start && x < va->va_end) {
ret = 1;
break;
}
}
spin_unlock(&vmap_area_lock);
return ret;
}
#else
int is_vmalloc_addr(const void *x)
{
unsigned long addr = (unsigned long)x;
return addr >= VMALLOC_START && addr < VMALLOC_END;
}
#endif
EXPORT_SYMBOL(is_vmalloc_addr);
int is_vmalloc_or_module_addr(const void *x)
{
/*
@ -299,9 +269,9 @@ EXPORT_SYMBOL(vmalloc_to_pfn);
#define VM_LAZY_FREEING 0x02
#define VM_VM_AREA 0x04
static DEFINE_SPINLOCK(vmap_area_lock);
/* Export for kexec only */
LIST_HEAD(vmap_area_list);
static DEFINE_SPINLOCK(vmap_area_lock);
static struct rb_root vmap_area_root = RB_ROOT;
/* The vmap cache globals are protected by vmap_area_lock */
@ -312,6 +282,47 @@ static unsigned long cached_align;
static unsigned long vmap_area_pcpu_hole;
#ifdef CONFIG_ENABLE_VMALLOC_SAVING
int is_vmalloc_addr(const void *x)
{
struct vmap_area *va;
int ret = 0;
spin_lock(&vmap_area_lock);
list_for_each_entry(va, &vmap_area_list, list) {
if (va->flags & (VM_LAZY_FREE | VM_LAZY_FREEING))
continue;
if (!(va->flags & VM_VM_AREA))
continue;
if (va->vm == NULL)
continue;
if (va->vm->flags & VM_LOWMEM)
continue;
if ((unsigned long)x >= va->va_start &&
(unsigned long)x < va->va_end) {
ret = 1;
break;
}
}
spin_unlock(&vmap_area_lock);
return ret;
}
#else
int is_vmalloc_addr(const void *x)
{
unsigned long addr = (unsigned long)x;
return addr >= VMALLOC_START && addr < VMALLOC_END;
}
#endif
EXPORT_SYMBOL(is_vmalloc_addr);
static struct vmap_area *__find_vmap_area(unsigned long addr)
{
struct rb_node *n = vmap_area_root.rb_node;