From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 30 Jan 2008 12:34:07 +0000 (+0100)
Subject: x86: cpa: fix split thinko
X-Git-Tag: firefly_0821_release~23636^2~43
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a72a08a4b61cb8868606a69b744848552e92062b;p=firefly-linux-kernel-4.4.55.git

x86: cpa: fix split thinko

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 23f0aa3d01c1..a2ee317548f2 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -216,8 +216,12 @@ repeat:
 	prot = static_protections(prot, address);
 
 	if (level == PG_LEVEL_4K) {
+		WARN_ON_ONCE(pgprot_val(prot) & _PAGE_PSE);
 		set_pte_atomic(kpte, pfn_pte(pfn, canon_pgprot(prot)));
 	} else {
+		/* Clear the PSE bit for the 4k level pages ! */
+		pgprot_val(prot) = pgprot_val(prot) & ~_PAGE_PSE;
+
 		err = split_large_page(kpte, address);
 		if (!err)
 			goto repeat;