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bootmem: stop using page->index

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Encode the type into the bottom four bits of page->private and the info
into the remaining bits.  Also turn the bootmem type into a named enum.

[arnd@arndb.de: bootmem: add bootmem_type stub function]
  Link: https://lkml.kernel.org/r/20241015143802.577613-1-arnd@kernel.org
[akpm@linux-foundation.org: fix build with !CONFIG_HAVE_BOOTMEM_INFO_NODE]
 Link: https://lore.kernel.org/oe-kbuild-all/202410090311.eaqcL7IZ-lkp@intel.com/
Link: https://lkml.kernel.org/r/20241005200121.3231142-6-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: kernel test robot <lkp@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle)
2024-10-05 21:01:16 +01:00
committed by Andrew Morton
parent 68158bfa3d
commit 0386aaa6e9
4 changed files with 56 additions and 26 deletions
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11
mm/bootmem_info.c
View File

@@ -14,23 +14,24 @@
#include <linux/memory_hotplug.h>
#include <linux/kmemleak.h>
void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
void get_page_bootmem(unsigned long info, struct page *page,
enum bootmem_type type)
{
page->index = type;
BUG_ON(type > 0xf);
BUG_ON(info > (ULONG_MAX >> 4));
SetPagePrivate(page);
set_page_private(page, info);
set_page_private(page, info << 4 | type);
page_ref_inc(page);
}
void put_page_bootmem(struct page *page)
{
unsigned long type = page->index;
enum bootmem_type type = bootmem_type(page);
BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
if (page_ref_dec_return(page) == 1) {
page->index = 0;
ClearPagePrivate(page);
set_page_private(page, 0);
INIT_LIST_HEAD(&page->lru);