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is_vmalloc_addr(): Check if an address is within the vmalloc boundaries

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Checking if an address is a vmalloc address is done in a couple of places.
Define a common version in mm.h and replace the other checks.

Again the include structures suck.  The definition of VMALLOC_START and
VMALLOC_END is not available in vmalloc.h since highmem.c cannot be included
there.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2008-02-04 22:28:34 -08:00 committed by Linus Torvalds
parent 0b7a96114b
commit 9e2779fa28
7 changed files with 14 additions and 19 deletions
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4
drivers/net/cxgb3/cxgb3_offload.c
View File

@ -1070,9 +1070,7 @@ void *cxgb_alloc_mem(unsigned long size)
*/
void cxgb_free_mem(void *addr)
{
unsigned long p = (unsigned long)addr;
if (p >= VMALLOC_START && p < VMALLOC_END)
if (is_vmalloc_addr(addr))
vfree(addr);
else
kfree(addr);

3
fs/ntfs/malloc.h
View File

@ -85,8 +85,7 @@ static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
static inline void ntfs_free(void *addr)
{
if (likely(((unsigned long)addr < VMALLOC_START) ||
((unsigned long)addr >= VMALLOC_END ))) {
if (!is_vmalloc_addr(addr)) {
kfree(addr);
/* free_page((unsigned long)addr); */
return;

2
fs/proc/kcore.c
View File

@ -325,7 +325,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
if (m == NULL) {
if (clear_user(buffer, tsz))
return -EFAULT;
} else if ((start >= VMALLOC_START) && (start < VMALLOC_END)) {
} else if (is_vmalloc_addr((void *)start)) {
char * elf_buf;
struct vm_struct *m;
unsigned long curstart = start;

3
fs/xfs/linux-2.6/kmem.c
View File

@ -92,8 +92,7 @@ kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize,
void
kmem_free(void *ptr, size_t size)
{
if (((unsigned long)ptr < VMALLOC_START) ||
((unsigned long)ptr >= VMALLOC_END)) {
if (!is_vmalloc_addr(ptr)) {
kfree(ptr);
} else {
vfree(ptr);

3
fs/xfs/linux-2.6/xfs_buf.c
View File

@ -709,8 +709,7 @@ static inline struct page *
mem_to_page(
void *addr)
{
if (((unsigned long)addr < VMALLOC_START) ||
((unsigned long)addr >= VMALLOC_END)) {
if ((!is_vmalloc_addr(addr))) {
return virt_to_page(addr);
} else {
return vmalloc_to_page(addr);

8
include/linux/mm.h
View File

@ -235,6 +235,14 @@ static inline int get_page_unless_zero(struct page *page)
struct page *vmalloc_to_page(const void *addr);
unsigned long vmalloc_to_pfn(const void *addr);
/* Determine if an address is within the vmalloc range */
static inline int is_vmalloc_addr(const void *x)
{
unsigned long addr = (unsigned long)x;
return addr >= VMALLOC_START && addr < VMALLOC_END;
}
static inline struct page *compound_head(struct page *page)
{
if (unlikely(PageTail(page)))

10
mm/sparse.c
View File

@ -353,17 +353,9 @@ static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
return __kmalloc_section_memmap(nr_pages);
}
static int vaddr_in_vmalloc_area(void *addr)
{
if (addr >= (void *)VMALLOC_START &&
addr < (void *)VMALLOC_END)
return 1;
return 0;
}
static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
{
if (vaddr_in_vmalloc_area(memmap))
if (is_vmalloc_addr(memmap))
vfree(memmap);
else
free_pages((unsigned long)memmap,