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Subject[PATCH] [6/36] CPA Handle 4K split pages at boot on 64bit
Date

Port the code to check for already split 4K pages at boot over from
32bit to 64bit.

Note: should be probably put before PAT patches to avoid bisect failures later
Signed-off-by: Andi Kleen <ak@suse.de>

---
arch/x86/mm/pageattr_64.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

Index: linux/arch/x86/mm/pageattr_64.c
===================================================================
--- linux.orig/arch/x86/mm/pageattr_64.c
+++ linux/arch/x86/mm/pageattr_64.c
@@ -160,11 +160,8 @@ __change_page_attr(unsigned long address
} else
BUG();

- /* on x86-64 the direct mapping set at boot is not using 4k pages */
- BUG_ON(PageReserved(kpte_page));
-
save_page(kpte_page);
- if (page_private(kpte_page) == 0)
+ if (!PageReserved(kpte_page) && page_private(kpte_page) == 0)
revert_page(address, ref_prot);
return 0;
}
@@ -243,6 +240,8 @@ void global_flush_tlb(void)

list_for_each_entry_safe(pg, next, &l, lru) {
list_del(&pg->lru);
+ if (PageReserved(pg))
+ continue;
clear_bit(PG_arch_1, &pg->flags);
if (page_private(pg) != 0)
continue;

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