On Thu, Mar 21, 2024 at 02:24:45PM +0000, Matthew Wilcox (Oracle) wrote: > Reclaim the Slab page flag by using a spare bit in PageType. We are > perennially short of page flags for various purposes, and now that > the original SLAB allocator has been retired, SLUB does not use the > mapcount/page_type field. This lets us remove a number of special cases > for ignoring mapcount on Slab pages. Update vmcoreinfo: diff --git a/kernel/vmcore_info.c b/kernel/vmcore_info.c index 23c125c2e243..1d5eadd9dd61 100644 --- a/kernel/vmcore_info.c +++ b/kernel/vmcore_info.c @@ -198,7 +198,8 @@ static int __init crash_save_vmcoreinfo_init(void) VMCOREINFO_NUMBER(PG_private); VMCOREINFO_NUMBER(PG_swapcache); VMCOREINFO_NUMBER(PG_swapbacked); - VMCOREINFO_NUMBER(PG_slab); +#define PAGE_SLAB_MAPCOUNT_VALUE (~PG_slab) + VMCOREINFO_NUMBER(PAGE_SLAB_MAPCOUNT_VALUE); #ifdef CONFIG_MEMORY_FAILURE VMCOREINFO_NUMBER(PG_hwpoison); #endif
