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linux-next/include/linux/bootmem.h
Rasmus Villemoes 48a270554a include/linux: apply __malloc attribute 
Attach the malloc attribute to a few allocation functions.  This helps
gcc generate better code by telling it that the return value doesn't
alias any existing pointers (which is even more valuable given the
pessimizations implied by -fno-strict-aliasing).

A simple example of what this allows gcc to do can be seen by looking at
the last part of drm_atomic_helper_plane_reset:

	plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);

	if (plane->state) {
		plane->state->plane = plane;
		plane->state->rotation = BIT(DRM_ROTATE_0);
	}

which compiles to

    e8 99 bf d6 ff          callq  ffffffff8116d540 <kmem_cache_alloc_trace>
    48 85 c0                test   %rax,%rax
    48 89 83 40 02 00 00    mov    %rax,0x240(%rbx)
    74 11                   je     ffffffff814015c4 <drm_atomic_helper_plane_reset+0x64>
    48 89 18                mov    %rbx,(%rax)
    48 8b 83 40 02 00 00    mov    0x240(%rbx),%rax [*]
    c7 40 40 01 00 00 00    movl   $0x1,0x40(%rax)

With this patch applied, the instruction at [*] is elided, since the
store to plane->state->plane is known to not alter the value of
plane->state.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
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>
Cc: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-19 19:12:14 -07:00

373 lines
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/*
* Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999
*/
#ifndef _LINUX_BOOTMEM_H
#define _LINUX_BOOTMEM_H
#include <linux/mmzone.h>
#include <linux/mm_types.h>
#include <asm/dma.h>
/*
* simple boot-time physical memory area allocator.
*/
extern unsigned long max_low_pfn;
extern unsigned long min_low_pfn;
/*
* highest page
*/
extern unsigned long max_pfn;
/*
* highest possible page
*/
extern unsigned long long max_possible_pfn;
#ifndef CONFIG_NO_BOOTMEM
/*
* node_bootmem_map is a map pointer - the bits represent all physical
* memory pages (including holes) on the node.
*/
typedef struct bootmem_data {
unsigned long node_min_pfn;
unsigned long node_low_pfn;
void *node_bootmem_map;
unsigned long last_end_off;
unsigned long hint_idx;
struct list_head list;
} bootmem_data_t;
extern bootmem_data_t bootmem_node_data[];
#endif
extern unsigned long bootmem_bootmap_pages(unsigned long);
extern unsigned long init_bootmem_node(pg_data_t *pgdat,
unsigned long freepfn,
unsigned long startpfn,
unsigned long endpfn);
extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
extern unsigned long free_all_bootmem(void);
extern void reset_node_managed_pages(pg_data_t *pgdat);
extern void reset_all_zones_managed_pages(void);
extern void free_bootmem_node(pg_data_t *pgdat,
unsigned long addr,
unsigned long size);
extern void free_bootmem(unsigned long physaddr, unsigned long size);
extern void free_bootmem_late(unsigned long physaddr, unsigned long size);
/*
* Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
* the architecture-specific code should honor this).
*
* If flags is BOOTMEM_DEFAULT, then the return value is always 0 (success).
* If flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the memory
* already was reserved.
*/
#define BOOTMEM_DEFAULT 0
#define BOOTMEM_EXCLUSIVE (1<<0)
extern int reserve_bootmem(unsigned long addr,
unsigned long size,
int flags);
extern int reserve_bootmem_node(pg_data_t *pgdat,
unsigned long physaddr,
unsigned long size,
int flags);
extern void *__alloc_bootmem(unsigned long size,
unsigned long align,
unsigned long goal);
extern void *__alloc_bootmem_nopanic(unsigned long size,
unsigned long align,
unsigned long goal) __malloc;
extern void *__alloc_bootmem_node(pg_data_t *pgdat,
unsigned long size,
unsigned long align,
unsigned long goal) __malloc;
void *__alloc_bootmem_node_high(pg_data_t *pgdat,
unsigned long size,
unsigned long align,
unsigned long goal) __malloc;
extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
unsigned long size,
unsigned long align,
unsigned long goal) __malloc;
void *___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
unsigned long size,
unsigned long align,
unsigned long goal,
unsigned long limit) __malloc;
extern void *__alloc_bootmem_low(unsigned long size,
unsigned long align,
unsigned long goal) __malloc;
void *__alloc_bootmem_low_nopanic(unsigned long size,
unsigned long align,
unsigned long goal) __malloc;
extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
unsigned long size,
unsigned long align,
unsigned long goal) __malloc;
#ifdef CONFIG_NO_BOOTMEM
/* We are using top down, so it is safe to use 0 here */
#define BOOTMEM_LOW_LIMIT 0
#else
#define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
#endif
#define alloc_bootmem(x) \
__alloc_bootmem(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
#define alloc_bootmem_align(x, align) \
__alloc_bootmem(x, align, BOOTMEM_LOW_LIMIT)
#define alloc_bootmem_nopanic(x) \
__alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
#define alloc_bootmem_pages(x) \
__alloc_bootmem(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
#define alloc_bootmem_pages_nopanic(x) \
__alloc_bootmem_nopanic(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
#define alloc_bootmem_node(pgdat, x) \
__alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
#define alloc_bootmem_node_nopanic(pgdat, x) \
__alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
#define alloc_bootmem_pages_node(pgdat, x) \
__alloc_bootmem_node(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
#define alloc_bootmem_pages_node_nopanic(pgdat, x) \
__alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
#define alloc_bootmem_low(x) \
__alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
#define alloc_bootmem_low_pages_nopanic(x) \
__alloc_bootmem_low_nopanic(x, PAGE_SIZE, 0)
#define alloc_bootmem_low_pages(x) \
__alloc_bootmem_low(x, PAGE_SIZE, 0)
#define alloc_bootmem_low_pages_node(pgdat, x) \
__alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
#if defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM)
/* FIXME: use MEMBLOCK_ALLOC_* variants here */
#define BOOTMEM_ALLOC_ACCESSIBLE 0
#define BOOTMEM_ALLOC_ANYWHERE (~(phys_addr_t)0)
/* FIXME: Move to memblock.h at a point where we remove nobootmem.c */
void *memblock_virt_alloc_try_nid_nopanic(phys_addr_t size,
phys_addr_t align, phys_addr_t min_addr,
phys_addr_t max_addr, int nid);
void *memblock_virt_alloc_try_nid(phys_addr_t size, phys_addr_t align,
phys_addr_t min_addr, phys_addr_t max_addr, int nid);
void __memblock_free_early(phys_addr_t base, phys_addr_t size);
void __memblock_free_late(phys_addr_t base, phys_addr_t size);
static inline void * __init memblock_virt_alloc(
phys_addr_t size, phys_addr_t align)
{
return memblock_virt_alloc_try_nid(size, align, BOOTMEM_LOW_LIMIT,
BOOTMEM_ALLOC_ACCESSIBLE,
NUMA_NO_NODE);
}
static inline void * __init memblock_virt_alloc_nopanic(
phys_addr_t size, phys_addr_t align)
{
return memblock_virt_alloc_try_nid_nopanic(size, align,
BOOTMEM_LOW_LIMIT,
BOOTMEM_ALLOC_ACCESSIBLE,
NUMA_NO_NODE);
}
#ifndef ARCH_LOW_ADDRESS_LIMIT
#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
#endif
static inline void * __init memblock_virt_alloc_low(
phys_addr_t size, phys_addr_t align)
{
return memblock_virt_alloc_try_nid(size, align,
BOOTMEM_LOW_LIMIT,
ARCH_LOW_ADDRESS_LIMIT,
NUMA_NO_NODE);
}
static inline void * __init memblock_virt_alloc_low_nopanic(
phys_addr_t size, phys_addr_t align)
{
return memblock_virt_alloc_try_nid_nopanic(size, align,
BOOTMEM_LOW_LIMIT,
ARCH_LOW_ADDRESS_LIMIT,
NUMA_NO_NODE);
}
static inline void * __init memblock_virt_alloc_from_nopanic(
phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
{
return memblock_virt_alloc_try_nid_nopanic(size, align, min_addr,
BOOTMEM_ALLOC_ACCESSIBLE,
NUMA_NO_NODE);
}
static inline void * __init memblock_virt_alloc_node(
phys_addr_t size, int nid)
{
return memblock_virt_alloc_try_nid(size, 0, BOOTMEM_LOW_LIMIT,
BOOTMEM_ALLOC_ACCESSIBLE, nid);
}
static inline void * __init memblock_virt_alloc_node_nopanic(
phys_addr_t size, int nid)
{
return memblock_virt_alloc_try_nid_nopanic(size, 0, BOOTMEM_LOW_LIMIT,
BOOTMEM_ALLOC_ACCESSIBLE,
nid);
}
static inline void __init memblock_free_early(
phys_addr_t base, phys_addr_t size)
{
__memblock_free_early(base, size);
}
static inline void __init memblock_free_early_nid(
phys_addr_t base, phys_addr_t size, int nid)
{
__memblock_free_early(base, size);
}
static inline void __init memblock_free_late(
phys_addr_t base, phys_addr_t size)
{
__memblock_free_late(base, size);
}
#else
#define BOOTMEM_ALLOC_ACCESSIBLE 0
/* Fall back to all the existing bootmem APIs */
static inline void * __init memblock_virt_alloc(
phys_addr_t size, phys_addr_t align)
{
if (!align)
align = SMP_CACHE_BYTES;
return __alloc_bootmem(size, align, BOOTMEM_LOW_LIMIT);
}
static inline void * __init memblock_virt_alloc_nopanic(
phys_addr_t size, phys_addr_t align)
{
if (!align)
align = SMP_CACHE_BYTES;
return __alloc_bootmem_nopanic(size, align, BOOTMEM_LOW_LIMIT);
}
static inline void * __init memblock_virt_alloc_low(
phys_addr_t size, phys_addr_t align)
{
if (!align)
align = SMP_CACHE_BYTES;
return __alloc_bootmem_low(size, align, 0);
}
static inline void * __init memblock_virt_alloc_low_nopanic(
phys_addr_t size, phys_addr_t align)
{
if (!align)
align = SMP_CACHE_BYTES;
return __alloc_bootmem_low_nopanic(size, align, 0);
}
static inline void * __init memblock_virt_alloc_from_nopanic(
phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
{
return __alloc_bootmem_nopanic(size, align, min_addr);
}
static inline void * __init memblock_virt_alloc_node(
phys_addr_t size, int nid)
{
return __alloc_bootmem_node(NODE_DATA(nid), size, SMP_CACHE_BYTES,
BOOTMEM_LOW_LIMIT);
}
static inline void * __init memblock_virt_alloc_node_nopanic(
phys_addr_t size, int nid)
{
return __alloc_bootmem_node_nopanic(NODE_DATA(nid), size,
SMP_CACHE_BYTES,
BOOTMEM_LOW_LIMIT);
}
static inline void * __init memblock_virt_alloc_try_nid(phys_addr_t size,
phys_addr_t align, phys_addr_t min_addr, phys_addr_t max_addr, int nid)
{
return __alloc_bootmem_node_high(NODE_DATA(nid), size, align,
min_addr);
}
static inline void * __init memblock_virt_alloc_try_nid_nopanic(
phys_addr_t size, phys_addr_t align,
phys_addr_t min_addr, phys_addr_t max_addr, int nid)
{
return ___alloc_bootmem_node_nopanic(NODE_DATA(nid), size, align,
min_addr, max_addr);
}
static inline void __init memblock_free_early(
phys_addr_t base, phys_addr_t size)
{
free_bootmem(base, size);
}
static inline void __init memblock_free_early_nid(
phys_addr_t base, phys_addr_t size, int nid)
{
free_bootmem_node(NODE_DATA(nid), base, size);
}
static inline void __init memblock_free_late(
phys_addr_t base, phys_addr_t size)
{
free_bootmem_late(base, size);
}
#endif /* defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM) */
#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
extern void *alloc_remap(int nid, unsigned long size);
#else
static inline void *alloc_remap(int nid, unsigned long size)
{
return NULL;
}
#endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
extern void *alloc_large_system_hash(const char *tablename,
unsigned long bucketsize,
unsigned long numentries,
int scale,
int flags,
unsigned int *_hash_shift,
unsigned int *_hash_mask,
unsigned long low_limit,
unsigned long high_limit);
#define HASH_EARLY 0x00000001 /* Allocating during early boot? */
#define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min
* shift passed via *_hash_shift */
/* Only NUMA needs hash distribution. 64bit NUMA architectures have
* sufficient vmalloc space.
*/
#ifdef CONFIG_NUMA
#define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT)
extern int hashdist; /* Distribute hashes across NUMA nodes? */
#else
#define hashdist (0)
#endif
#endif /* _LINUX_BOOTMEM_H */
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