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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu: don't assume existence of cpu0
This commit is contained in:
Linus Torvalds 2009-09-05 14:22:00 -07:00
commit 931f70350e
1 changed files with 14 additions and 1 deletions
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15
mm/percpu.c
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@ -197,7 +197,12 @@ static unsigned long pcpu_chunk_addr(struct pcpu_chunk *chunk,
static bool pcpu_chunk_page_occupied(struct pcpu_chunk *chunk,
int page_idx)
{
return *pcpu_chunk_pagep(chunk, 0, page_idx) != NULL;
/*
* Any possible cpu id can be used here, so there's no need to
* worry about preemption or cpu hotplug.
*/
return *pcpu_chunk_pagep(chunk, raw_smp_processor_id(),
page_idx) != NULL;
}
/* set the pointer to a chunk in a page struct */
@ -297,6 +302,14 @@ static struct pcpu_chunk *pcpu_chunk_addr_search(void *addr)
return pcpu_first_chunk;
}
/*
* The address is relative to unit0 which might be unused and
* thus unmapped. Offset the address to the unit space of the
* current processor before looking it up in the vmalloc
* space. Note that any possible cpu id can be used here, so
* there's no need to worry about preemption or cpu hotplug.
*/
addr += raw_smp_processor_id() * pcpu_unit_size;
return pcpu_get_page_chunk(vmalloc_to_page(addr));
}