static void __init __free_pages_memory(unsigned long start, unsigned long end)
{
int i;
unsigned long start_aligned, end_aligned;
int order = ilog2(BITS_PER_LONG);
start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
end_aligned = end & ~(BITS_PER_LONG - 1);
if (end_aligned <= start_aligned) {
for (i = start; i < end; i++)
__free_pages_bootmem(pfn_to_page(i), 0);
return;
}
for (i = start; i < start_aligned; i++)
__free_pages_bootmem(pfn_to_page(i), 0);
for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
__free_pages_bootmem(pfn_to_page(i), order);
for (i = end_aligned; i < end; i++)
__free_pages_bootmem(pfn_to_page(i), 0);
}
/*
* free_bootmem_late - free bootmem pages directly to page allocator
* @addr: starting address of the range
* @size: size of the range in bytes
*
* This is only useful when the bootmem allocator has already been torn
* down, but we are still initializing the system. Pages are given directly
* to the page allocator, no bootmem metadata is updated because it is gone.
*/
void __init free_bootmem_late(unsigned long addr, unsigned long size)
{
unsigned long cursor, end;
cursor = PFN_UP(addr);
end = PFN_DOWN(addr + size);
for (; cursor < end; cursor++) {
__free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
totalram_pages++;
}
}
static void __init __free_pages_memory(unsigned long start, unsigned long end)
{
int order;
while (start < end) {
/* IAMROOT-12AB:
* -------------
* 버디 시스템은 MAX_ORDER-1 단위의 order를 등록하지 않기 때문에 min() 함수로
* 잘라낸다. (arm32: MAX_ORDER=11, 버디시스템에 최대 4M 단위 페이지가 등록된다)
*
* 메모리 영역의 시작 부분 관련
* - 시작 pfn으로 order를 먼저 결정을 한다.
* - 단 MAX_ORDER-1을 넘지 않도록 제한한다.
*/
order = min(MAX_ORDER - 1UL, __ffs(start));
/* IAMROOT-12AB:
* -------------
* 메모리 영역의 끝 부분 관련
* - order를 더해 end를 초과하는 경우 order를 줄여나간다.
*/
while (start + (1UL << order) > end)
order--;
/* IAMROOT-12AB:
* -------------
* 해재할 메모리를 order 단위로 버디시스템에 돌려준다(free)
*
* 예) start=0x12345, end=0x13456
* start order
* ------- -----
* loop 01: 0x12345 0
* loop 02: 0x12346 1
* loop 03: 0x12348 3
* loop 04: 0x12350 4
* loop 05: 0x12360 5
* loop 06: 0x12380 7
* loop 07: 0x12400 10
* loop 08: 0x12800 10
* loop 09: 0x12c00 10
* loop 10: 0x13000 10
* loop 11: 0x13400 6
* loop 12: 0x13440 4
* loop 13: 0x13450 2
* loop 14: 0x13454 1
*/
__free_pages_bootmem(pfn_to_page(start), order);
start += (1UL << order);
}
}
/*
* free_bootmem_late - free bootmem pages directly to page allocator
* @addr: starting address of the range
* @size: size of the range in bytes
*
* This is only useful when the bootmem allocator has already been torn
* down, but we are still initializing the system. Pages are given directly
* to the page allocator, no bootmem metadata is updated because it is gone.
*/
void free_bootmem_late(unsigned long addr, unsigned long size)
{
unsigned long cursor, end;
kmemleak_free_part(__va(addr), size);
cursor = PFN_UP(addr);
end = PFN_DOWN(addr + size);
for (; cursor < end; cursor++) {
__free_pages_bootmem(pfn_to_page(cursor), 0);
totalram_pages++;
}
}
static void __init __free_pages_memory(unsigned long start, unsigned long end)
{
int order;
while (start < end) {
order = min(MAX_ORDER - 1UL, __ffs(start));
while (start + (1UL << order) > end)
order--;
__free_pages_bootmem(pfn_to_page(start), start, order);
start += (1UL << order);
}
}
