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>
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@ -73,7 +73,7 @@ struct kmem_cache_cpu {
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* given order would contain.
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*/
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struct kmem_cache_order_objects {
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unsigned long x;
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unsigned int x;
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};
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/*
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74
mm/slub.c
74
mm/slub.c
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@ -316,13 +316,13 @@ static inline unsigned int slab_index(void *p, struct kmem_cache *s, void *addr)
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return (p - addr) / s->size;
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}
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static inline int order_objects(int order, unsigned long size, int reserved)
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static inline unsigned int order_objects(unsigned int order, unsigned int size, unsigned int reserved)
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{
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return ((PAGE_SIZE << order) - reserved) / size;
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return (((unsigned int)PAGE_SIZE << order) - reserved) / size;
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}
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static inline struct kmem_cache_order_objects oo_make(int order,
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unsigned long size, int reserved)
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static inline struct kmem_cache_order_objects oo_make(unsigned int order,
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unsigned int size, unsigned int reserved)
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{
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struct kmem_cache_order_objects x = {
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(order << OO_SHIFT) + order_objects(order, size, reserved)
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@ -331,12 +331,12 @@ static inline struct kmem_cache_order_objects oo_make(int order,
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return x;
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}
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static inline int oo_order(struct kmem_cache_order_objects x)
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static inline unsigned int oo_order(struct kmem_cache_order_objects x)
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{
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return x.x >> OO_SHIFT;
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}
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static inline int oo_objects(struct kmem_cache_order_objects x)
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static inline unsigned int oo_objects(struct kmem_cache_order_objects x)
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{
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return x.x & OO_MASK;
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}
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@ -1436,7 +1436,7 @@ static inline struct page *alloc_slab_page(struct kmem_cache *s,
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gfp_t flags, int node, struct kmem_cache_order_objects oo)
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{
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struct page *page;
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int order = oo_order(oo);
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unsigned int order = oo_order(oo);
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if (node == NUMA_NO_NODE)
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page = alloc_pages(flags, order);
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@ -1455,8 +1455,8 @@ static inline struct page *alloc_slab_page(struct kmem_cache *s,
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/* Pre-initialize the random sequence cache */
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static int init_cache_random_seq(struct kmem_cache *s)
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{
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unsigned int count = oo_objects(s->oo);
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int err;
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unsigned long i, count = oo_objects(s->oo);
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/* Bailout if already initialised */
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if (s->random_seq)
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@ -1471,6 +1471,8 @@ static int init_cache_random_seq(struct kmem_cache *s)
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/* Transform to an offset on the set of pages */
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if (s->random_seq) {
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unsigned int i;
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for (i = 0; i < count; i++)
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s->random_seq[i] *= s->size;
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}
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@ -2399,7 +2401,7 @@ slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
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pr_warn("SLUB: Unable to allocate memory on node %d, gfp=%#x(%pGg)\n",
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nid, gfpflags, &gfpflags);
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pr_warn(" cache: %s, object size: %u, buffer size: %u, default order: %d, min order: %d\n",
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pr_warn(" cache: %s, object size: %u, buffer size: %u, default order: %u, min order: %u\n",
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s->name, s->object_size, s->size, oo_order(s->oo),
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oo_order(s->min));
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@ -3182,9 +3184,9 @@ EXPORT_SYMBOL(kmem_cache_alloc_bulk);
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* and increases the number of allocations possible without having to
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* take the list_lock.
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*/
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static int slub_min_order;
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static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER;
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static int slub_min_objects;
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static unsigned int slub_min_order;
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static unsigned int slub_max_order = PAGE_ALLOC_COSTLY_ORDER;
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static unsigned int slub_min_objects;
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/*
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* Calculate the order of allocation given an slab object size.
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@ -3211,20 +3213,21 @@ static int slub_min_objects;
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* requested a higher mininum order then we start with that one instead of
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* the smallest order which will fit the object.
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*/
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static inline int slab_order(int size, int min_objects,
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int max_order, int fract_leftover, int reserved)
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static inline unsigned int slab_order(unsigned int size,
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unsigned int min_objects, unsigned int max_order,
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unsigned int fract_leftover, unsigned int reserved)
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{
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int order;
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int rem;
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int min_order = slub_min_order;
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unsigned int min_order = slub_min_order;
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unsigned int order;
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if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE)
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return get_order(size * MAX_OBJS_PER_PAGE) - 1;
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for (order = max(min_order, get_order(min_objects * size + reserved));
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for (order = max(min_order, (unsigned int)get_order(min_objects * size + reserved));
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order <= max_order; order++) {
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unsigned long slab_size = PAGE_SIZE << order;
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unsigned int slab_size = (unsigned int)PAGE_SIZE << order;
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unsigned int rem;
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rem = (slab_size - reserved) % size;
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@ -3235,12 +3238,11 @@ static inline int slab_order(int size, int min_objects,
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return order;
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}
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static inline int calculate_order(int size, int reserved)
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static inline int calculate_order(unsigned int size, unsigned int reserved)
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{
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int order;
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int min_objects;
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int fraction;
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int max_objects;
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unsigned int order;
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unsigned int min_objects;
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unsigned int max_objects;
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/*
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* Attempt to find best configuration for a slab. This
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@ -3257,6 +3259,8 @@ static inline int calculate_order(int size, int reserved)
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min_objects = min(min_objects, max_objects);
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while (min_objects > 1) {
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unsigned int fraction;
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fraction = 16;
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while (fraction >= 4) {
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order = slab_order(size, min_objects,
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@ -3459,7 +3463,7 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
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{
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slab_flags_t flags = s->flags;
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unsigned int size = s->object_size;
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int order;
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unsigned int order;
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/*
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* Round up object size to the next word boundary. We can only
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@ -3549,7 +3553,7 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
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else
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order = calculate_order(size, s->reserved);
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if (order < 0)
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if ((int)order < 0)
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return 0;
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s->allocflags = 0;
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@ -3717,7 +3721,7 @@ int __kmem_cache_shutdown(struct kmem_cache *s)
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static int __init setup_slub_min_order(char *str)
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{
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get_option(&str, &slub_min_order);
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get_option(&str, (int *)&slub_min_order);
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return 1;
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}
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@ -3726,8 +3730,8 @@ __setup("slub_min_order=", setup_slub_min_order);
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static int __init setup_slub_max_order(char *str)
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{
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get_option(&str, &slub_max_order);
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slub_max_order = min(slub_max_order, MAX_ORDER - 1);
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get_option(&str, (int *)&slub_max_order);
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slub_max_order = min(slub_max_order, (unsigned int)MAX_ORDER - 1);
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return 1;
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}
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@ -3736,7 +3740,7 @@ __setup("slub_max_order=", setup_slub_max_order);
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static int __init setup_slub_min_objects(char *str)
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{
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get_option(&str, &slub_min_objects);
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get_option(&str, (int *)&slub_min_objects);
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return 1;
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}
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@ -4231,7 +4235,7 @@ void __init kmem_cache_init(void)
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cpuhp_setup_state_nocalls(CPUHP_SLUB_DEAD, "slub:dead", NULL,
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slub_cpu_dead);
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pr_info("SLUB: HWalign=%d, Order=%d-%d, MinObjects=%d, CPUs=%u, Nodes=%d\n",
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pr_info("SLUB: HWalign=%d, Order=%u-%u, MinObjects=%u, CPUs=%u, Nodes=%d\n",
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cache_line_size(),
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slub_min_order, slub_max_order, slub_min_objects,
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nr_cpu_ids, nr_node_ids);
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@ -4907,17 +4911,17 @@ SLAB_ATTR_RO(object_size);
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static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf)
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{
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return sprintf(buf, "%d\n", oo_objects(s->oo));
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return sprintf(buf, "%u\n", oo_objects(s->oo));
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}
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SLAB_ATTR_RO(objs_per_slab);
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static ssize_t order_store(struct kmem_cache *s,
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const char *buf, size_t length)
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{
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unsigned long order;
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unsigned int order;
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int err;
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err = kstrtoul(buf, 10, &order);
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err = kstrtouint(buf, 10, &order);
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if (err)
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return err;
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static ssize_t order_show(struct kmem_cache *s, char *buf)
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{
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return sprintf(buf, "%d\n", oo_order(s->oo));
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return sprintf(buf, "%u\n", oo_order(s->oo));
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}
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SLAB_ATTR(order);
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