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percpu: kill legacy percpu allocator

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With ia64 converted, there's no arch left which still uses legacy
percpu allocator.  Kill it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Delightedly-acked-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
This commit is contained in:
Tejun Heo 2009-07-21 21:18:35 +09:00
parent 52594762a3
commit 23fb064bb9
5 changed files with 0 additions and 357 deletions
Download patch file Download diff file Expand all files Collapse all files

150
kernel/module.c
View file

@ -370,8 +370,6 @@ EXPORT_SYMBOL_GPL(find_module);
#ifdef CONFIG_SMP
#ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA
static void *percpu_modalloc(unsigned long size, unsigned long align,
const char *name)
{
@ -395,154 +393,6 @@ static void percpu_modfree(void *freeme)
free_percpu(freeme);
}
#else /* ... CONFIG_HAVE_LEGACY_PER_CPU_AREA */
/* Number of blocks used and allocated. */
static unsigned int pcpu_num_used, pcpu_num_allocated;
/* Size of each block. -ve means used. */
static int *pcpu_size;
static int split_block(unsigned int i, unsigned short size)
{
/* Reallocation required? */
if (pcpu_num_used + 1 > pcpu_num_allocated) {
int *new;
new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
GFP_KERNEL);
if (!new)
return 0;
pcpu_num_allocated *= 2;
pcpu_size = new;
}
/* Insert a new subblock */
memmove(&pcpu_size[i+1], &pcpu_size[i],
sizeof(pcpu_size[0]) * (pcpu_num_used - i));
pcpu_num_used++;
pcpu_size[i+1] -= size;
pcpu_size[i] = size;
return 1;
}
static inline unsigned int block_size(int val)
{
if (val < 0)
return -val;
return val;
}
static void *percpu_modalloc(unsigned long size, unsigned long align,
const char *name)
{
unsigned long extra;
unsigned int i;
void *ptr;
int cpu;
if (align > PAGE_SIZE) {
printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
name, align, PAGE_SIZE);
align = PAGE_SIZE;
}
ptr = __per_cpu_start;
for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
/* Extra for alignment requirement. */
extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
BUG_ON(i == 0 && extra != 0);
if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
continue;
/* Transfer extra to previous block. */
if (pcpu_size[i-1] < 0)
pcpu_size[i-1] -= extra;
else
pcpu_size[i-1] += extra;
pcpu_size[i] -= extra;
ptr += extra;
/* Split block if warranted */
if (pcpu_size[i] - size > sizeof(unsigned long))
if (!split_block(i, size))
return NULL;
/* add the per-cpu scanning areas */
for_each_possible_cpu(cpu)
kmemleak_alloc(ptr + per_cpu_offset(cpu), size, 0,
GFP_KERNEL);
/* Mark allocated */
pcpu_size[i] = -pcpu_size[i];
return ptr;
}
printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
size);
return NULL;
}
static void percpu_modfree(void *freeme)
{
unsigned int i;
void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
int cpu;
/* First entry is core kernel percpu data. */
for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
if (ptr == freeme) {
pcpu_size[i] = -pcpu_size[i];
goto free;
}
}
BUG();
free:
/* remove the per-cpu scanning areas */
for_each_possible_cpu(cpu)
kmemleak_free(freeme + per_cpu_offset(cpu));
/* Merge with previous? */
if (pcpu_size[i-1] >= 0) {
pcpu_size[i-1] += pcpu_size[i];
pcpu_num_used--;
memmove(&pcpu_size[i], &pcpu_size[i+1],
(pcpu_num_used - i) * sizeof(pcpu_size[0]));
i--;
}
/* Merge with next? */
if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
pcpu_size[i] += pcpu_size[i+1];
pcpu_num_used--;
memmove(&pcpu_size[i+1], &pcpu_size[i+2],
(pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
}
}
static int percpu_modinit(void)
{
pcpu_num_used = 2;
pcpu_num_allocated = 2;
pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
GFP_KERNEL);
/* Static in-kernel percpu data (used). */
pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
/* Free room. */
pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
if (pcpu_size[1] < 0) {
printk(KERN_ERR "No per-cpu room for modules.\n");
pcpu_num_used = 1;
}
return 0;
}
__initcall(percpu_modinit);
#endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */
static unsigned int find_pcpusec(Elf_Ehdr *hdr,
Elf_Shdr *sechdrs,
const char *secstrings)