1 files changed, 10 insertions, 44 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 3230cd2c6b3b..50a73fca19c4 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -145,30 +145,6 @@
 #define BYTES_PER_WORD          sizeof(void *)
 #define REDZONE_ALIGN           max(BYTES_PER_WORD, __alignof__(unsigned long long))
 
-#ifndef ARCH_KMALLOC_MINALIGN
-/*
- * Enforce a minimum alignment for the kmalloc caches.
- * Usually, the kmalloc caches are cache_line_size() aligned, except when
- * DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned.
- * Some archs want to perform DMA into kmalloc caches and need a guaranteed
- * alignment larger than the alignment of a 64-bit integer.
- * ARCH_KMALLOC_MINALIGN allows that.
- * Note that increasing this value may disable some debug features.
- */
-#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
-#endif
-
-#ifndef ARCH_SLAB_MINALIGN
-/*
- * Enforce a minimum alignment for all caches.
- * Intended for archs that get misalignment faults even for BYTES_PER_WORD
- * aligned buffers. Includes ARCH_KMALLOC_MINALIGN.
- * If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables
- * some debug features.
- */
-#define ARCH_SLAB_MINALIGN 0
-#endif
-
 #ifndef ARCH_KMALLOC_FLAGS
 #define ARCH_KMALLOC_FLAGS SLAB_HWCACHE_ALIGN
 #endif
@@ -2313,8 +2289,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
         if (ralign < align) {
                 ralign = align;
         }
-        /* disable debug if necessary */
-        if (ralign > __alignof__(unsigned long long))
+        /* disable debug if not aligning with REDZONE_ALIGN */
+        if (ralign & (__alignof__(unsigned long long) - 1))
                 flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
         /*
          * 4) Store it.
@@ -2340,8 +2316,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
          */
         if (flags & SLAB_RED_ZONE) {
                 /* add space for red zone words */
-                cachep->obj_offset += sizeof(unsigned long long);
-                size += 2 * sizeof(unsigned long long);
+                cachep->obj_offset += align;
+                size += align + sizeof(unsigned long long);
         }
         if (flags & SLAB_STORE_USER) {
                 /* user store requires one word storage behind the end of
@@ -3695,21 +3671,10 @@ EXPORT_SYMBOL(kmem_cache_alloc_notrace);
  */
 int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr)
 {
-        unsigned long addr = (unsigned long)ptr;
-        unsigned long min_addr = PAGE_OFFSET;
-        unsigned long align_mask = BYTES_PER_WORD - 1;
         unsigned long size = cachep->buffer_size;
         struct page *page;
 
-        if (unlikely(addr < min_addr))
-                goto out;
-        if (unlikely(addr > (unsigned long)high_memory - size))
-                goto out;
-        if (unlikely(addr & align_mask))
-                goto out;
-        if (unlikely(!kern_addr_valid(addr)))
-                goto out;
-        if (unlikely(!kern_addr_valid(addr + size - 1)))
+        if (unlikely(!kern_ptr_validate(ptr, size)))
                 goto out;
         page = virt_to_page(ptr);
         if (unlikely(!PageSlab(page)))
@@ -4320,10 +4285,11 @@ static int s_show(struct seq_file *m, void *p)
                 unsigned long node_frees = cachep->node_frees;
                 unsigned long overflows = cachep->node_overflow;
 
-                seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \
-                                %4lu %4lu %4lu %4lu %4lu", allocs, high, grown,
-                                reaped, errors, max_freeable, node_allocs,
-                                node_frees, overflows);
+                seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu "
+                           "%4lu %4lu %4lu %4lu %4lu",
+                           allocs, high, grown,
+                           reaped, errors, max_freeable, node_allocs,
+                           node_frees, overflows);
         }
         /* cpu stats */
         {