slub: make struct kmem_cache_order_objects::x unsigned int

struct kmem_cache_order_objects is for mixing order and number of
objects, and orders aren't big enough to warrant 64-bit width.

Propagate unsignedness down so that everything fits.

!!! Patch assumes that "PAGE_SIZE << order" doesn't overflow. !!!

Link: http://lkml.kernel.org/r/20180305200730.15812-23-adobriyan@gmail.com
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 623d6ba..3773e26 100644 (file)
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -73,7 +73,7 @@ struct kmem_cache_cpu {
  * given order would contain.
  */
 struct kmem_cache_order_objects {
-       unsigned long x;
+       unsigned int x;
 };
 
 /*

diff --git a/mm/slub.c b/mm/slub.c
index 5c5b9ae..21e9de8 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -316,13 +316,13 @@ static inline unsigned int slab_index(void *p, struct kmem_cache *s, void *addr)
        return (p - addr) / s->size;
 }
 
-static inline int order_objects(int order, unsigned long size, int reserved)
+static inline unsigned int order_objects(unsigned int order, unsigned int size, unsigned int reserved)
 {
-       return ((PAGE_SIZE << order) - reserved) / size;
+       return (((unsigned int)PAGE_SIZE << order) - reserved) / size;
 }
 
-static inline struct kmem_cache_order_objects oo_make(int order,
-               unsigned long size, int reserved)
+static inline struct kmem_cache_order_objects oo_make(unsigned int order,
+               unsigned int size, unsigned int reserved)
 {
        struct kmem_cache_order_objects x = {
                (order << OO_SHIFT) + order_objects(order, size, reserved)
@@ -331,12 +331,12 @@ static inline struct kmem_cache_order_objects oo_make(int order,
        return x;
 }
 
-static inline int oo_order(struct kmem_cache_order_objects x)
+static inline unsigned int oo_order(struct kmem_cache_order_objects x)
 {
        return x.x >> OO_SHIFT;
 }
 
-static inline int oo_objects(struct kmem_cache_order_objects x)
+static inline unsigned int oo_objects(struct kmem_cache_order_objects x)
 {
        return x.x & OO_MASK;
 }
@@ -1436,7 +1436,7 @@ static inline struct page *alloc_slab_page(struct kmem_cache *s,
                gfp_t flags, int node, struct kmem_cache_order_objects oo)
 {
        struct page *page;
-       int order = oo_order(oo);
+       unsigned int order = oo_order(oo);
 
        if (node == NUMA_NO_NODE)
                page = alloc_pages(flags, order);
@@ -1455,8 +1455,8 @@ static inline struct page *alloc_slab_page(struct kmem_cache *s,
 /* Pre-initialize the random sequence cache */
 static int init_cache_random_seq(struct kmem_cache *s)
 {
+       unsigned int count = oo_objects(s->oo);
        int err;
-       unsigned long i, count = oo_objects(s->oo);
 
        /* Bailout if already initialised */
        if (s->random_seq)
@@ -1471,6 +1471,8 @@ static int init_cache_random_seq(struct kmem_cache *s)
 
        /* Transform to an offset on the set of pages */
        if (s->random_seq) {
+               unsigned int i;
+
                for (i = 0; i < count; i++)
                        s->random_seq[i] *= s->size;
        }
@@ -2399,7 +2401,7 @@ slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
 
        pr_warn("SLUB: Unable to allocate memory on node %d, gfp=%#x(%pGg)\n",
                nid, gfpflags, &gfpflags);
-       pr_warn("  cache: %s, object size: %u, buffer size: %u, default order: %d, min order: %d\n",
+       pr_warn("  cache: %s, object size: %u, buffer size: %u, default order: %u, min order: %u\n",
                s->name, s->object_size, s->size, oo_order(s->oo),
                oo_order(s->min));
 
@@ -3182,9 +3184,9 @@ EXPORT_SYMBOL(kmem_cache_alloc_bulk);
  * and increases the number of allocations possible without having to
  * take the list_lock.
  */
-static int slub_min_order;
-static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER;
-static int slub_min_objects;
+static unsigned int slub_min_order;
+static unsigned int slub_max_order = PAGE_ALLOC_COSTLY_ORDER;
+static unsigned int slub_min_objects;
 
 /*
  * Calculate the order of allocation given an slab object size.
@@ -3211,20 +3213,21 @@ static int slub_min_objects;
  * requested a higher mininum order then we start with that one instead of
  * the smallest order which will fit the object.
  */
-static inline int slab_order(int size, int min_objects,
-                               int max_order, int fract_leftover, int reserved)
+static inline unsigned int slab_order(unsigned int size,
+               unsigned int min_objects, unsigned int max_order,
+               unsigned int fract_leftover, unsigned int reserved)
 {
-       int order;
-       int rem;
-       int min_order = slub_min_order;
+       unsigned int min_order = slub_min_order;
+       unsigned int order;
 
        if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE)
                return get_order(size * MAX_OBJS_PER_PAGE) - 1;
 
-       for (order = max(min_order, get_order(min_objects * size + reserved));
+       for (order = max(min_order, (unsigned int)get_order(min_objects * size + reserved));
                        order <= max_order; order++) {
 
-               unsigned long slab_size = PAGE_SIZE << order;
+               unsigned int slab_size = (unsigned int)PAGE_SIZE << order;
+               unsigned int rem;
 
                rem = (slab_size - reserved) % size;
 
@@ -3235,12 +3238,11 @@ static inline int slab_order(int size, int min_objects,
        return order;
 }
 
-static inline int calculate_order(int size, int reserved)
+static inline int calculate_order(unsigned int size, unsigned int reserved)
 {
-       int order;
-       int min_objects;
-       int fraction;
-       int max_objects;
+       unsigned int order;
+       unsigned int min_objects;
+       unsigned int max_objects;
 
        /*
         * Attempt to find best configuration for a slab. This
@@ -3257,6 +3259,8 @@ static inline int calculate_order(int size, int reserved)
        min_objects = min(min_objects, max_objects);
 
        while (min_objects > 1) {
+               unsigned int fraction;
+
                fraction = 16;
                while (fraction >= 4) {
                        order = slab_order(size, min_objects,
@@ -3459,7 +3463,7 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
 {
        slab_flags_t flags = s->flags;
        unsigned int size = s->object_size;
-       int order;
+       unsigned int order;
 
        /*
         * Round up object size to the next word boundary. We can only
@@ -3549,7 +3553,7 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
        else
                order = calculate_order(size, s->reserved);
 
-       if (order < 0)
+       if ((int)order < 0)
                return 0;
 
        s->allocflags = 0;
@@ -3717,7 +3721,7 @@ int __kmem_cache_shutdown(struct kmem_cache *s)
 
 static int __init setup_slub_min_order(char *str)
 {
-       get_option(&str, &slub_min_order);
+       get_option(&str, (int *)&slub_min_order);
 
        return 1;
 }
@@ -3726,8 +3730,8 @@ __setup("slub_min_order=", setup_slub_min_order);
 
 static int __init setup_slub_max_order(char *str)
 {
-       get_option(&str, &slub_max_order);
-       slub_max_order = min(slub_max_order, MAX_ORDER - 1);
+       get_option(&str, (int *)&slub_max_order);
+       slub_max_order = min(slub_max_order, (unsigned int)MAX_ORDER - 1);
 
        return 1;
 }
@@ -3736,7 +3740,7 @@ __setup("slub_max_order=", setup_slub_max_order);
 
 static int __init setup_slub_min_objects(char *str)
 {
-       get_option(&str, &slub_min_objects);
+       get_option(&str, (int *)&slub_min_objects);
 
        return 1;
 }
@@ -4231,7 +4235,7 @@ void __init kmem_cache_init(void)
        cpuhp_setup_state_nocalls(CPUHP_SLUB_DEAD, "slub:dead", NULL,
                                  slub_cpu_dead);
 
-       pr_info("SLUB: HWalign=%d, Order=%d-%d, MinObjects=%d, CPUs=%u, Nodes=%d\n",
+       pr_info("SLUB: HWalign=%d, Order=%u-%u, MinObjects=%u, CPUs=%u, Nodes=%d\n",
                cache_line_size(),
                slub_min_order, slub_max_order, slub_min_objects,
                nr_cpu_ids, nr_node_ids);
@@ -4907,17 +4911,17 @@ SLAB_ATTR_RO(object_size);
 
 static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf)
 {
-       return sprintf(buf, "%d\n", oo_objects(s->oo));
+       return sprintf(buf, "%u\n", oo_objects(s->oo));
 }
 SLAB_ATTR_RO(objs_per_slab);
 
 static ssize_t order_store(struct kmem_cache *s,
                                const char *buf, size_t length)
 {
-       unsigned long order;
+       unsigned int order;
        int err;
 
-       err = kstrtoul(buf, 10, &order);
+       err = kstrtouint(buf, 10, &order);
        if (err)
                return err;
 
@@ -4930,7 +4934,7 @@ static ssize_t order_store(struct kmem_cache *s,
 
 static ssize_t order_show(struct kmem_cache *s, char *buf)
 {
-       return sprintf(buf, "%d\n", oo_order(s->oo));
+       return sprintf(buf, "%u\n", oo_order(s->oo));
 }
 SLAB_ATTR(order);