linux-kernel - [PATCH] [6/36] CPA Handle 4K split pages at boot on 64bit

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Date:	Wed, 16 Jan 2008 23:15:04 +0100 (CET)
From:	Andi Kleen <ak@...e.de>
To:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	jbeulich@...ell.com, venkatesh.pallipadi@...el.com
Subject: [PATCH] [6/36] CPA Handle 4K split pages at boot on 64bit


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@...e.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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