From 648609e3f24599a5ad8d53df2ec13fbc37810bcc Mon Sep 17 00:00:00 2001
From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Date: Tue, 21 Aug 2012 12:36:34 +0200
Subject: [PATCH] s390: enable large page support with CONFIG_DEBUG_PAGEALLOC

So far, large page support was completely disabled with
CONFIG_DEBUG_PAGEALLOC, although it would be sufficient if only the
large page kernel mapping was disabled. This patch enables large page
support with CONFIG_DEBUG_PAGEALLOC, while it prevents the large kernel
mapping in that case.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
 arch/s390/kernel/early.c | 2 --
 arch/s390/mm/vmem.c      | 2 +-
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 83c3271c442b..e48407962b0f 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -267,12 +267,10 @@ static noinline __init void setup_facility_list(void)
 
 static noinline __init void setup_hpage(void)
 {
-#ifndef CONFIG_DEBUG_PAGEALLOC
 	if (!test_facility(2) || !test_facility(8))
 		return;
 	S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
 	__ctl_set_bit(0, 23);
-#endif
 }
 
 static __init void detect_mvpg(void)
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 6f896e75ab49..c22abf900c9e 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -107,7 +107,7 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
 		pte = mk_pte_phys(address, __pgprot(ro ? _PAGE_RO : 0));
 		pm_dir = pmd_offset(pu_dir, address);
 
-#ifdef CONFIG_64BIT
+#if defined(CONFIG_64BIT) && !defined(CONFIG_DEBUG_PAGEALLOC)
 		if (MACHINE_HAS_HPAGE && !(address & ~HPAGE_MASK) &&
 		    (address + HPAGE_SIZE <= start + size) &&
 		    (address >= HPAGE_SIZE)) {
-- 
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