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bootmem: Use page->index instead of page->freelist 

page->freelist is for the use of slab.  Using page->index is the same
set of bits as page->freelist, and by using an integer instead of a
pointer, we can avoid casts.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: <x86@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-10-04 14:46:48 +01:00 committed by Vlastimil Babka
parent ffedd09fa9
commit c5e97ed154
4 changed files with 6 additions and 7 deletions
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2
arch/x86/mm/init_64.c
View File

@ -981,7 +981,7 @@ static void __meminit free_pagetable(struct page *page, int order)
if (PageReserved(page)) {
__ClearPageReserved(page);
magic = (unsigned long)page->freelist;
magic = page->index;
if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
while (nr_pages--)
put_page_bootmem(page++);

2
include/linux/bootmem_info.h
View File

@ -30,7 +30,7 @@ void put_page_bootmem(struct page *page);
*/
static inline void free_bootmem_page(struct page *page)
{
unsigned long magic = (unsigned long)page->freelist;
unsigned long magic = page->index;
/*
* The reserve_bootmem_region sets the reserved flag on bootmem

7
mm/bootmem_info.c
View File

@ -15,7 +15,7 @@
void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
{
page->freelist = (void *)type;
page->index = type;
SetPagePrivate(page);
set_page_private(page, info);
page_ref_inc(page);
@ -23,14 +23,13 @@ void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
void put_page_bootmem(struct page *page)
{
unsigned long type;
unsigned long type = page->index;
type = (unsigned long) page->freelist;
BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
if (page_ref_dec_return(page) == 1) {
page->freelist = NULL;
page->index = 0;
ClearPagePrivate(page);
set_page_private(page, 0);
INIT_LIST_HEAD(&page->lru);

2
mm/sparse.c
View File

@ -722,7 +722,7 @@ static void free_map_bootmem(struct page *memmap)
>> PAGE_SHIFT;
for (i = 0; i < nr_pages; i++, page++) {
magic = (unsigned long) page->freelist;
magic = page->index;
BUG_ON(magic == NODE_INFO);