kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

[PATCH] remove set_page_count() outside mm/

Browse source 
set_page_count usage outside mm/ is limited to setting the refcount to 1.
Remove set_page_count from outside mm/, and replace those users with
init_page_count() and set_page_refcounted().

This allows more debug checking, and tighter control on how code is allowed
to play around with page->_count.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-03-22 00:08:40 -08:00 committed by Linus Torvalds
parent 70dc991d66
commit 7835e98b2e
40 changed files with 96 additions and 79 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/alpha/mm/init.c
View file

@ -357,7 +357,7 @@ free_reserved_mem(void *start, void *end)
void *__start = start;
for (; __start < end; __start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(__start));
set_page_count(virt_to_page(__start), 1);
init_page_count(virt_to_page(__start));
free_page((long)__start);
totalram_pages++;
}

2
arch/arm/mm/init.c
View file

@ -531,7 +531,7 @@ static inline void free_area(unsigned long addr, unsigned long end, char *s)
for (; addr < end; addr += PAGE_SIZE) {
struct page *page = virt_to_page(addr);
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
free_page(addr);
totalram_pages++;
}

2
arch/arm26/mm/init.c
View file

@ -324,7 +324,7 @@ static inline void free_area(unsigned long addr, unsigned long end, char *s)
for (; addr < end; addr += PAGE_SIZE) {
struct page *page = virt_to_page(addr);
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
free_page(addr);
totalram_pages++;
}

2
arch/cris/mm/init.c
View file

@ -216,7 +216,7 @@ free_initmem(void)
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}

6
arch/frv/mm/init.c
View file

@ -169,7 +169,7 @@ void __init mem_init(void)
struct page *page = &mem_map[pfn];
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
totalram_pages++;
}
@ -210,7 +210,7 @@ void __init free_initmem(void)
/* next to check that the page we free is not a partial page */
for (addr = start; addr < end; addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
@ -230,7 +230,7 @@ void __init free_initrd_mem(unsigned long start, unsigned long end)
int pages = 0;
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
pages++;

4
arch/h8300/mm/init.c
View file

@ -196,7 +196,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
int pages = 0;
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
pages++;
@ -219,7 +219,7 @@ free_initmem()
/* next to check that the page we free is not a partial page */
for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}

6
arch/i386/mm/init.c
View file

@ -270,7 +270,7 @@ static void __init permanent_kmaps_init(pgd_t *pgd_base)
static void __meminit free_new_highpage(struct page *page)
{
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
totalhigh_pages++;
}
@ -727,7 +727,7 @@ void free_initmem(void)
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
memset((void *)addr, 0xcc, PAGE_SIZE);
free_page(addr);
totalram_pages++;
@ -766,7 +766,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
}

6
arch/ia64/mm/init.c
View file

@ -197,7 +197,7 @@ free_initmem (void)
eaddr = (unsigned long) ia64_imva(__init_end);
while (addr < eaddr) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
++totalram_pages;
addr += PAGE_SIZE;
@ -252,7 +252,7 @@ free_initrd_mem (unsigned long start, unsigned long end)
continue;
page = virt_to_page(start);
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
free_page(start);
++totalram_pages;
}
@ -640,7 +640,7 @@ mem_init (void)
void online_page(struct page *page)
{
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
totalram_pages++;
num_physpages++;

4
arch/m32r/mm/init.c
View file

@ -226,7 +226,7 @@ void free_initmem(void)
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
@ -244,7 +244,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
unsigned long p;
for (p = start; p < end; p += PAGE_SIZE) {
ClearPageReserved(virt_to_page(p));
set_page_count(virt_to_page(p), 1);
init_page_count(virt_to_page(p));
free_page(p);
totalram_pages++;
}

2
arch/m68k/mm/init.c
View file

@ -137,7 +137,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
int pages = 0;
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
pages++;

2
arch/m68k/mm/memory.c
View file

@ -54,7 +54,7 @@ void __init init_pointer_table(unsigned long ptable)
/* unreserve the page so it's possible to free that page */
PD_PAGE(dp)->flags &= ~(1 << PG_reserved);
set_page_count(PD_PAGE(dp), 1);
init_page_count(PD_PAGE(dp));
return;
}

2
arch/m68k/mm/motorola.c
View file

@ -276,7 +276,7 @@ void free_initmem(void)
addr = (unsigned long)&__init_begin;
for (; addr < (unsigned long)&__init_end; addr += PAGE_SIZE) {
virt_to_page(addr)->flags &= ~(1 << PG_reserved);
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}

4
arch/m68knommu/mm/init.c
View file

@ -195,7 +195,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
int pages = 0;
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
pages++;
@ -218,7 +218,7 @@ free_initmem()
/* next to check that the page we free is not a partial page */
for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}

2
arch/mips/arc/memory.c
View file

@ -158,7 +158,7 @@ unsigned long __init prom_free_prom_memory(void)
while (addr < boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size) {
ClearPageReserved(virt_to_page(__va(addr)));
set_page_count(virt_to_page(__va(addr)), 1);
init_page_count(virt_to_page(__va(addr)));
free_page((unsigned long)__va(addr));
addr += PAGE_SIZE;
freed += PAGE_SIZE;

2
arch/mips/dec/prom/memory.c
View file

@ -118,7 +118,7 @@ unsigned long __init prom_free_prom_memory(void)
addr = PAGE_SIZE;
while (addr < end) {
ClearPageReserved(virt_to_page(__va(addr)));
set_page_count(virt_to_page(__va(addr)), 1);
init_page_count(virt_to_page(__va(addr)));
free_page((unsigned long)__va(addr));
addr += PAGE_SIZE;
}

2
arch/mips/mips-boards/generic/memory.c
View file

@ -174,7 +174,7 @@ unsigned long __init prom_free_prom_memory(void)
while (addr < boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size) {
ClearPageReserved(virt_to_page(__va(addr)));
set_page_count(virt_to_page(__va(addr)), 1);
init_page_count(virt_to_page(__va(addr)));
free_page((unsigned long)__va(addr));
addr += PAGE_SIZE;
freed += PAGE_SIZE;

2
arch/mips/mips-boards/sim/sim_mem.c
View file

@ -117,7 +117,7 @@ unsigned long __init prom_free_prom_memory(void)
while (addr < boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size) {
ClearPageReserved(virt_to_page(__va(addr)));
set_page_count(virt_to_page(__va(addr)), 1);
init_page_count(virt_to_page(__va(addr)));
free_page((unsigned long)__va(addr));
addr += PAGE_SIZE;
freed += PAGE_SIZE;

6
arch/mips/mm/init.c
View file

@ -245,7 +245,7 @@ void __init mem_init(void)
#ifdef CONFIG_LIMITED_DMA
set_page_address(page, lowmem_page_address(page));
#endif
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
totalhigh_pages++;
}
@ -292,7 +292,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
}
@ -315,7 +315,7 @@ void free_initmem(void)
page = addr;
#endif
ClearPageReserved(virt_to_page(page));
set_page_count(virt_to_page(page), 1);
init_page_count(virt_to_page(page));
free_page(page);
totalram_pages++;
freed += PAGE_SIZE;

2
arch/mips/sgi-ip27/ip27-memory.c
View file

@ -559,7 +559,7 @@ void __init mem_init(void)
/* if (!page_is_ram(pgnr)) continue; */
/* commented out until page_is_ram works */
ClearPageReserved(p);
set_page_count(p, 1);
init_page_count(p);
__free_page(p);
totalram_pages++;
}

4
arch/parisc/mm/init.c
View file

@ -398,7 +398,7 @@ void free_initmem(void)
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
num_physpages++;
totalram_pages++;
@ -1018,7 +1018,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
num_physpages++;
totalram_pages++;

4
arch/powerpc/mm/init_32.c
View file

@ -216,7 +216,7 @@ static void free_sec(unsigned long start, unsigned long end, const char *name)
while (start < end) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
cnt++;
start += PAGE_SIZE;
@ -248,7 +248,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
}

4
arch/powerpc/mm/init_64.c
View file

@ -140,7 +140,7 @@ void free_initmem(void)
for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
memset((void *)addr, 0xcc, PAGE_SIZE);
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
@ -155,7 +155,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
}

4
arch/powerpc/mm/mem.c
View file

@ -108,7 +108,7 @@ EXPORT_SYMBOL(phys_mem_access_prot);
void online_page(struct page *page)
{
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
totalram_pages++;
num_physpages++;
@ -376,7 +376,7 @@ void __init mem_init(void)
struct page *page = pfn_to_page(pfn);
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
totalhigh_pages++;
}

2
arch/powerpc/platforms/cell/setup.c
View file

@ -115,7 +115,7 @@ static void __init cell_spuprop_present(struct device_node *spe,
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
struct page *page = pfn_to_page(pfn);
set_page_links(page, ZONE_DMA, node_id, pfn);
set_page_count(page, 1);
init_page_count(page);
reset_page_mapcount(page);
SetPageReserved(page);
INIT_LIST_HEAD(&page->lru);

6
arch/ppc/mm/init.c
View file

@ -140,7 +140,7 @@ static void free_sec(unsigned long start, unsigned long end, const char *name)
while (start < end) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
cnt++;
start += PAGE_SIZE;
@ -172,7 +172,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
}
@ -441,7 +441,7 @@ void __init mem_init(void)
struct page *page = mem_map + pfn;
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
totalhigh_pages++;
}

4
arch/s390/mm/init.c
View file

@ -292,7 +292,7 @@ void free_initmem(void)
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
@ -307,7 +307,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
}

4
arch/sh/mm/init.c
View file

@ -273,7 +273,7 @@ void free_initmem(void)
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
@ -286,7 +286,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
unsigned long p;
for (p = start; p < end; p += PAGE_SIZE) {
ClearPageReserved(virt_to_page(p));
set_page_count(virt_to_page(p), 1);
init_page_count(virt_to_page(p));
free_page(p);
totalram_pages++;
}

4
arch/sh64/mm/init.c
View file

@ -173,7 +173,7 @@ void free_initmem(void)
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
@ -186,7 +186,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
unsigned long p;
for (p = start; p < end; p += PAGE_SIZE) {
ClearPageReserved(virt_to_page(p));
set_page_count(virt_to_page(p), 1);
init_page_count(virt_to_page(p));
free_page(p);
totalram_pages++;
}

6
arch/sparc/kernel/sun4d_smp.c
View file

@ -266,19 +266,19 @@ void __init smp4d_boot_cpus(void)
/* Free unneeded trap tables */
ClearPageReserved(virt_to_page(trapbase_cpu1));
set_page_count(virt_to_page(trapbase_cpu1), 1);
init_page_count(virt_to_page(trapbase_cpu1));
free_page((unsigned long)trapbase_cpu1);
totalram_pages++;
num_physpages++;
ClearPageReserved(virt_to_page(trapbase_cpu2));
set_page_count(virt_to_page(trapbase_cpu2), 1);
init_page_count(virt_to_page(trapbase_cpu2));
free_page((unsigned long)trapbase_cpu2);
totalram_pages++;
num_physpages++;
ClearPageReserved(virt_to_page(trapbase_cpu3));
set_page_count(virt_to_page(trapbase_cpu3), 1);
init_page_count(virt_to_page(trapbase_cpu3));
free_page((unsigned long)trapbase_cpu3);
totalram_pages++;
num_physpages++;

6
arch/sparc/kernel/sun4m_smp.c
View file

@ -233,21 +233,21 @@ void __init smp4m_boot_cpus(void)
/* Free unneeded trap tables */
if (!cpu_isset(i, cpu_present_map)) {
ClearPageReserved(virt_to_page(trapbase_cpu1));
set_page_count(virt_to_page(trapbase_cpu1), 1);
init_page_count(virt_to_page(trapbase_cpu1));
free_page((unsigned long)trapbase_cpu1);
totalram_pages++;
num_physpages++;
}
if (!cpu_isset(2, cpu_present_map)) {
ClearPageReserved(virt_to_page(trapbase_cpu2));
set_page_count(virt_to_page(trapbase_cpu2), 1);
init_page_count(virt_to_page(trapbase_cpu2));
free_page((unsigned long)trapbase_cpu2);
totalram_pages++;
num_physpages++;
}
if (!cpu_isset(3, cpu_present_map)) {
ClearPageReserved(virt_to_page(trapbase_cpu3));
set_page_count(virt_to_page(trapbase_cpu3), 1);
init_page_count(virt_to_page(trapbase_cpu3));
free_page((unsigned long)trapbase_cpu3);
totalram_pages++;
num_physpages++;

6
arch/sparc/mm/init.c
View file

@ -383,7 +383,7 @@ void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
struct page *page = pfn_to_page(tmp);
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
totalhigh_pages++;
}
@ -480,7 +480,7 @@ void free_initmem (void)
p = virt_to_page(addr);
ClearPageReserved(p);
set_page_count(p, 1);
init_page_count(p);
__free_page(p);
totalram_pages++;
num_physpages++;
@ -497,7 +497,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
struct page *p = virt_to_page(start);
ClearPageReserved(p);
set_page_count(p, 1);
init_page_count(p);
__free_page(p);
num_physpages++;
}

4
arch/sparc64/mm/init.c
View file

@ -1461,7 +1461,7 @@ void free_initmem(void)
p = virt_to_page(page);
ClearPageReserved(p);
set_page_count(p, 1);
init_page_count(p);
__free_page(p);
num_physpages++;
totalram_pages++;
@ -1477,7 +1477,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
struct page *p = virt_to_page(start);
ClearPageReserved(p);
set_page_count(p, 1);
init_page_count(p);
__free_page(p);
num_physpages++;
totalram_pages++;

4
arch/um/kernel/mem.c
View file

@ -57,7 +57,7 @@ static void setup_highmem(unsigned long highmem_start,
for(i = 0; i < highmem_len >> PAGE_SHIFT; i++){
page = &mem_map[highmem_pfn + i];
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
}
}
@ -296,7 +296,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
(end - start) >> 10);
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
}

6
arch/x86_64/mm/init.c
View file

@ -486,7 +486,7 @@ void __init clear_kernel_mapping(unsigned long address, unsigned long size)
void online_page(struct page *page)
{
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
__free_page(page);
totalram_pages++;
num_physpages++;
@ -592,7 +592,7 @@ void free_initmem(void)
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
init_page_count(virt_to_page(addr));
memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE);
free_page(addr);
totalram_pages++;
@ -632,7 +632,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
}

2
arch/xtensa/mm/init.c
View file

@ -272,7 +272,7 @@ free_reserved_mem(void *start, void *end)
{
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
init_page_count(virt_to_page(start));
free_page((unsigned long)start);
totalram_pages++;
}

2
drivers/video/acornfb.c
View file

@ -1269,7 +1269,7 @@ free_unused_pages(unsigned int virtual_start, unsigned int virtual_end)
*/
page = virt_to_page(virtual_start);
ClearPageReserved(page);
set_page_count(page, 1);
init_page_count(page);
free_page(virtual_start);
virtual_start += PAGE_SIZE;

11
include/linux/mm.h
View file

@ -307,8 +307,6 @@ static inline int get_page_unless_zero(struct page *page)
return atomic_inc_not_zero(&page->_count);
}
#define set_page_count(p,v) atomic_set(&(p)->_count, (v))
extern void FASTCALL(__page_cache_release(struct page *));
static inline int page_count(struct page *page)
@ -325,6 +323,15 @@ static inline void get_page(struct page *page)
atomic_inc(&page->_count);
}
/*
* Setup the page count before being freed into the page allocator for
* the first time (boot or memory hotplug)
*/
static inline void init_page_count(struct page *page)
{
atomic_set(&page->_count, 1);
}
void put_page(struct page *page);
void split_page(struct page *page, unsigned int order);

5
mm/hugetlb.c
View file

@ -18,6 +18,7 @@
#include <asm/pgtable.h>
#include <linux/hugetlb.h>
#include "internal.h"
const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;
static unsigned long nr_huge_pages, free_huge_pages;
@ -106,7 +107,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, unsigned long addr)
return NULL;
}
spin_unlock(&hugetlb_lock);
set_page_count(page, 1);
set_page_refcounted(page);
for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i)
clear_user_highpage(&page[i], addr);
return page;
@ -152,7 +153,7 @@ static void update_and_free_page(struct page *page)
1 << PG_private | 1<< PG_writeback);
}
page[1].lru.next = NULL;
set_page_count(page, 1);
set_page_refcounted(page);
__free_pages(page, HUGETLB_PAGE_ORDER);
}

13
mm/internal.h
View file

@ -13,8 +13,19 @@
#include <linux/mm.h>
static inline void set_page_refs(struct page *page, int order)
static inline void set_page_count(struct page *page, int v)
{
atomic_set(&page->_count, v);
}
/*
* Turn a non-refcounted page (->_count == 0) into refcounted with
* a count of one.
*/
static inline void set_page_refcounted(struct page *page)
{
BUG_ON(PageCompound(page) && page_private(page) != (unsigned long)page);
BUG_ON(atomic_read(&page->_count));
set_page_count(page, 1);
}

14
mm/page_alloc.c
View file

@ -442,7 +442,7 @@ void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order)
if (order == 0) {
__ClearPageReserved(page);
set_page_count(page, 0);
set_page_refs(page, 0);
set_page_refcounted(page);
__free_page(page);
} else {
int loop;
@ -457,7 +457,7 @@ void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order)
set_page_count(p, 0);
}
set_page_refs(page, order);
set_page_refcounted(page);
__free_pages(page, order);
}
}
@ -525,7 +525,7 @@ static int prep_new_page(struct page *page, int order)
1 << PG_referenced | 1 << PG_arch_1 |
1 << PG_checked | 1 << PG_mappedtodisk);
set_page_private(page, 0);
set_page_refs(page, order);
set_page_refcounted(page);
kernel_map_pages(page, 1 << order, 1);
return 0;
}
@ -755,10 +755,8 @@ void split_page(struct page *page, unsigned int order)
BUG_ON(PageCompound(page));
BUG_ON(!page_count(page));
for (i = 1; i < (1 << order); i++) {
BUG_ON(page_count(page + i));
set_page_count(page + i, 1);
}
for (i = 1; i < (1 << order); i++)
set_page_refcounted(page + i);
}
/*
@ -1771,7 +1769,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
continue;
page = pfn_to_page(pfn);
set_page_links(page, zone, nid, pfn);
set_page_count(page, 1);
init_page_count(page);
reset_page_mapcount(page);
SetPageReserved(page);
INIT_LIST_HEAD(&page->lru);