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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2015-04-15 16:14:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-15 16:35:18 -0700
commit65ebb64f4d2ce8eba4d0ec82d6cf65022e70e4a1 (patch)
tree52086d74382f1645a649794585c8f3f2581c6313 /mm/huge_memory.c
parentbdfedb76f4f5aa5e37380e3b71adee4a39f30fc6 (diff)
thp: handle errors in hugepage_init() properly
We miss error-handling in few cases hugepage_init(). Let's fix that. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 1db93fbda06a..c257006749bb 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -67,6 +67,7 @@ static unsigned int khugepaged_max_ptes_none __read_mostly = HPAGE_PMD_NR-1;
static int khugepaged(void *none);
static int khugepaged_slab_init(void);
+static void khugepaged_slab_exit(void);
#define MM_SLOTS_HASH_BITS 10
static __read_mostly DEFINE_HASHTABLE(mm_slots_hash, MM_SLOTS_HASH_BITS);
@@ -634,13 +635,15 @@ static int __init hugepage_init(void)
err = hugepage_init_sysfs(&hugepage_kobj);
if (err)
- return err;
+ goto err_sysfs;
err = khugepaged_slab_init();
if (err)
- goto out;
+ goto err_slab;
- register_shrinker(&huge_zero_page_shrinker);
+ err = register_shrinker(&huge_zero_page_shrinker);
+ if (err)
+ goto err_hzp_shrinker;
/*
* By default disable transparent hugepages on smaller systems,
@@ -650,11 +653,18 @@ static int __init hugepage_init(void)
if (totalram_pages < (512 << (20 - PAGE_SHIFT)))
transparent_hugepage_flags = 0;
- start_khugepaged();
+ err = start_khugepaged();
+ if (err)
+ goto err_khugepaged;
return 0;
-out:
+err_khugepaged:
+ unregister_shrinker(&huge_zero_page_shrinker);
+err_hzp_shrinker:
+ khugepaged_slab_exit();
+err_slab:
hugepage_exit_sysfs(hugepage_kobj);
+err_sysfs:
return err;
}
subsys_initcall(hugepage_init);
@@ -1974,6 +1984,11 @@ static int __init khugepaged_slab_init(void)
return 0;
}
+static void __init khugepaged_slab_exit(void)
+{
+ kmem_cache_destroy(mm_slot_cache);
+}
+
static inline struct mm_slot *alloc_mm_slot(void)
{
if (!mm_slot_cache) /* initialization failed */