Revision 81c20b96e51660762f7d0df58b5faa370d47e3fd authored by Linus Torvalds on 06 October 2010, 20:27:19 UTC, committed by Linus Torvalds on 06 October 2010, 20:27:19 UTC
* 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus: MIPS: Octeon: Place cnmips_cu2_setup in __init memory. MIPS: Don't place cu2 notifiers in __cpuinitdata MIPS: Calculate VMLINUZ_LOAD_ADDRESS based on the length of vmlinux.bin MIPS: Alchemy: Resolve prom section mismatches MIPS: Fix syscall 64 bit number comments. MIPS: Hookup fanotify_init, fanotify_mark, and prlimit64 syscalls. MIPS: TX49xx: Rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN MIPS: N32: Fix getdents64 syscall for n32 MIPS: Remove pr_<level> uses of KERN_<level> MIPS: PNX8550: Sort out machine halt, restart and powerdown functions. MIPS: GIC: Remove dependencies from Malta files. MIPS: Kconfig: Fix and clarify kconfig help text for VSMP and SMTC. MIPS: DMA: Fix computation of DMA flags from device's coherent_dma_mask. MIPS: Audit: Fix hang in entry.S. MIPS: Document why RELOC_HIDE is there. MIPS: Octeon: Determine if helper needs to be built MIPS: Use generic atomic64 for 32-bit kernels MIPS: RM7000: Symbol should be static MIPS: kspd: Adjust confusing if indentation MIPS: Fix a typo.
percpu-km.c
/*
* mm/percpu-km.c - kernel memory based chunk allocation
*
* Copyright (C) 2010 SUSE Linux Products GmbH
* Copyright (C) 2010 Tejun Heo <tj@kernel.org>
*
* This file is released under the GPLv2.
*
* Chunks are allocated as a contiguous kernel memory using gfp
* allocation. This is to be used on nommu architectures.
*
* To use percpu-km,
*
* - define CONFIG_NEED_PER_CPU_KM from the arch Kconfig.
*
* - CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK must not be defined. It's
* not compatible with PER_CPU_KM. EMBED_FIRST_CHUNK should work
* fine.
*
* - NUMA is not supported. When setting up the first chunk,
* @cpu_distance_fn should be NULL or report all CPUs to be nearer
* than or at LOCAL_DISTANCE.
*
* - It's best if the chunk size is power of two multiple of
* PAGE_SIZE. Because each chunk is allocated as a contiguous
* kernel memory block using alloc_pages(), memory will be wasted if
* chunk size is not aligned. percpu-km code will whine about it.
*/
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
#error "contiguous percpu allocation is incompatible with paged first chunk"
#endif
#include <linux/log2.h>
static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
{
/* noop */
return 0;
}
static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size)
{
/* nada */
}
static struct pcpu_chunk *pcpu_create_chunk(void)
{
const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
struct pcpu_chunk *chunk;
struct page *pages;
int i;
chunk = pcpu_alloc_chunk();
if (!chunk)
return NULL;
pages = alloc_pages(GFP_KERNEL, order_base_2(nr_pages));
if (!pages) {
pcpu_free_chunk(chunk);
return NULL;
}
for (i = 0; i < nr_pages; i++)
pcpu_set_page_chunk(nth_page(pages, i), chunk);
chunk->data = pages;
chunk->base_addr = page_address(pages) - pcpu_group_offsets[0];
return chunk;
}
static void pcpu_destroy_chunk(struct pcpu_chunk *chunk)
{
const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
if (chunk && chunk->data)
__free_pages(chunk->data, order_base_2(nr_pages));
pcpu_free_chunk(chunk);
}
static struct page *pcpu_addr_to_page(void *addr)
{
return virt_to_page(addr);
}
static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai)
{
size_t nr_pages, alloc_pages;
/* all units must be in a single group */
if (ai->nr_groups != 1) {
printk(KERN_CRIT "percpu: can't handle more than one groups\n");
return -EINVAL;
}
nr_pages = (ai->groups[0].nr_units * ai->unit_size) >> PAGE_SHIFT;
alloc_pages = roundup_pow_of_two(nr_pages);
if (alloc_pages > nr_pages)
printk(KERN_WARNING "percpu: wasting %zu pages per chunk\n",
alloc_pages - nr_pages);
return 0;
}
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