summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorAndrea Arcangeli <aarcange@redhat.com>2011-01-13 15:47:09 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:45 -0800
commit4b7167b9ff9b7f3f528cbc4c7d02ebd275b9b10c (patch)
treead2c23c28b9dea009daf3719aefeb79103e2c152
parent94fcc585fb85ad7b059c70872489b50044d401f3 (diff)
downloadop-kernel-dev-4b7167b9ff9b7f3f528cbc4c7d02ebd275b9b10c.zip
op-kernel-dev-4b7167b9ff9b7f3f528cbc4c7d02ebd275b9b10c.tar.gz
thp: don't allow transparent hugepage support without PSE
Archs implementing Transparent Hugepage Support must implement a function called has_transparent_hugepage to be sure the virtual or physical CPU supports Transparent Hugepages. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/x86/include/asm/pgtable.h5
-rw-r--r--mm/huge_memory.c8
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index c48ba05..18601c8 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -160,6 +160,11 @@ static inline int pmd_trans_huge(pmd_t pmd)
{
return pmd_val(pmd) & _PAGE_PSE;
}
+
+static inline int has_transparent_hugepage(void)
+{
+ return cpu_has_pse;
+}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b6facc3..915809b 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -487,7 +487,15 @@ static int __init hugepage_init(void)
int err;
#ifdef CONFIG_SYSFS
static struct kobject *hugepage_kobj;
+#endif
+ err = -EINVAL;
+ if (!has_transparent_hugepage()) {
+ transparent_hugepage_flags = 0;
+ goto out;
+ }
+
+#ifdef CONFIG_SYSFS
err = -ENOMEM;
hugepage_kobj = kobject_create_and_add("transparent_hugepage", mm_kobj);
if (unlikely(!hugepage_kobj)) {
OpenPOWER on IntegriCloud