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>

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 83c3271c442b75d5d005e1e6130f538deea968a7..e48407962b0fbd401b449298a7187bacdf624d70 100644 (file)
--- 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 6f896e75ab49da1f58eb83c249a7e880f800a3ea..c22abf900c9e8a1e5b1db3bb36b9f77530dd0901 100644 (file)
--- 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)) {