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Revert "memory hotplug: Correct page reservation checking" 

This reverts commit 54f23eb7ba.

Turns out this patch is wrong, another correct one will follow it.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2011-10-18 14:00:57 -07:00
parent 5fa224295f
commit de0ed36a3e
1 changed files with 23 additions and 37 deletions
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60
drivers/base/memory.c
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@ -227,42 +227,41 @@ int memory_isolate_notify(unsigned long val, void *v)
* MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
* OK to have direct references to sparsemem variables in here.
*/
static int check_page_reservations(unsigned long phys_index)
{
int i;
struct page *page;
page = pfn_to_page(phys_index << PFN_SECTION_SHIFT);
for (i = 0; i < PAGES_PER_SECTION; i++) {
if (PageReserved(page + i))
continue;
printk(KERN_WARNING "section number %ld page number %d "
"not reserved, was it already online?\n", phys_index, i);
return -EBUSY;
}
return 0;
}
static int
memory_block_action(unsigned long phys_index, unsigned long action)
{
int i;
unsigned long start_pfn, start_paddr;
unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
struct page *page;
struct page *first_page;
int ret;
page = pfn_to_page(phys_index << PFN_SECTION_SHIFT);
first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT);
/*
* The probe routines leave the pages reserved, just
* as the bootmem code does. Make sure they're still
* that way.
*/
if (action == MEM_ONLINE) {
for (i = 0; i < nr_pages; i++) {
if (PageReserved(first_page+i))
continue;
printk(KERN_WARNING "section number %ld page number %d "
"not reserved, was it already online?\n",
phys_index, i);
return -EBUSY;
}
}
switch (action) {
case MEM_ONLINE:
start_pfn = page_to_pfn(page);
start_pfn = page_to_pfn(first_page);
ret = online_pages(start_pfn, nr_pages);
break;
case MEM_OFFLINE:
start_paddr = page_to_pfn(page) << PAGE_SHIFT;
start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
ret = remove_memory(start_paddr,
nr_pages << PAGE_SHIFT);
break;
@ -278,7 +277,7 @@ memory_block_action(unsigned long phys_index, unsigned long action)
static int memory_block_change_state(struct memory_block *mem,
unsigned long to_state, unsigned long from_state_req)
{
int i, ret = 0;
int ret = 0;
mutex_lock(&mem->state_mutex);
@ -290,19 +289,6 @@ static int memory_block_change_state(struct memory_block *mem,
if (to_state == MEM_OFFLINE)
mem->state = MEM_GOING_OFFLINE;
if (to_state == MEM_ONLINE) {
/*
* The probe routines leave the pages reserved, just
* as the bootmem code does. Make sure they're still
* that way.
*/
for (i = 0; i < sections_per_block; i++) {
ret = check_page_reservations(mem->start_section_nr + i);
if (ret)
return ret;
}
}
ret = memory_block_action(mem->start_section_nr, to_state);
if (ret)