[PATCH] thp: handle errors in hugepage_init() properly

[PATCH] thp: handle errors in hugepage_init() properly

[Kirill A. Shutemov]

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>
---
 mm/huge_memory.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 3f1504322187..a1594b18bc1b 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);
@@ -2009,6 +2019,11 @@ 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 */
-- 
2.1.4

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Re: [PATCH] thp: handle errors in hugepage_init() properly

[David Rientjes]

On Thu, 26 Mar 2015, Kirill A. Shutemov wrote:

> 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>

For completeness, it would probably make sense to suppress the 
set_recommended_min_free_kbytes() in start_khugepaged() when the kthread 
can't properly be created as well.

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