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s390: enable large page support with CONFIG_DEBUG_PAGEALLOC

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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>
This commit is contained in:
Gerald Schaefer 2012-08-21 12:36:34 +02:00 committed by Martin Schwidefsky
parent 535c611ddd
commit 648609e3f2
2 changed files with 1 additions and 3 deletions
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2
arch/s390/kernel/early.c
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@ -267,12 +267,10 @@ static noinline __init void setup_facility_list(void)
static noinline __init void setup_hpage(void) static noinline __init void setup_hpage(void)
{ {
#ifndef CONFIG_DEBUG_PAGEALLOC
if (!test_facility(2) || !test_facility(8)) if (!test_facility(2) || !test_facility(8))
return; return;
S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
__ctl_set_bit(0, 23); __ctl_set_bit(0, 23);
#endif
} }
static __init void detect_mvpg(void) static __init void detect_mvpg(void)

2
arch/s390/mm/vmem.c
View file

@ -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)); pte = mk_pte_phys(address, __pgprot(ro ? _PAGE_RO : 0));
pm_dir = pmd_offset(pu_dir, address); 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) && if (MACHINE_HAS_HPAGE && !(address & ~HPAGE_MASK) &&
(address + HPAGE_SIZE <= start + size) && (address + HPAGE_SIZE <= start + size) &&
(address >= HPAGE_SIZE)) { (address >= HPAGE_SIZE)) {