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percpu: factor out pcpu_addr_in_first/reserved_chunk() and update per_cpu_ptr_to_phys()

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Factor out pcpu_addr_in_first/reserved_chunk() from
pcpu_chunk_addr_search() and use it to update per_cpu_ptr_to_phys()
such that it handles first chunk differently from the rest.

This patch doesn't cause any functional change and is to prepare for
percpu nommu support.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: David Howells <dhowells@redhat.com>
Cc: Graff Yang <graff.yang@gmail.com>
Cc: Sonic Zhang <sonic.adi@gmail.com>
This commit is contained in:
Tejun Heo 2010-04-09 18:57:00 +09:00
parent be1066bbcd
commit 020ec6537a
1 changed files with 24 additions and 8 deletions
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32
mm/percpu.c
View File

@ -177,6 +177,21 @@ static struct list_head *pcpu_slot __read_mostly; /* chunk list slots */
static void pcpu_reclaim(struct work_struct *work);
static DECLARE_WORK(pcpu_reclaim_work, pcpu_reclaim);
static bool pcpu_addr_in_first_chunk(void *addr)
{
void *first_start = pcpu_first_chunk->base_addr;
return addr >= first_start && addr < first_start + pcpu_unit_size;
}
static bool pcpu_addr_in_reserved_chunk(void *addr)
{
void *first_start = pcpu_first_chunk->base_addr;
return addr >= first_start &&
addr < first_start + pcpu_reserved_chunk_limit;
}
static int __pcpu_size_to_slot(int size)
{
int highbit = fls(size); /* size is in bytes */
@ -334,12 +349,10 @@ static void pcpu_chunk_relocate(struct pcpu_chunk *chunk, int oslot)
*/
static struct pcpu_chunk *pcpu_chunk_addr_search(void *addr)
{
void *first_start = pcpu_first_chunk->base_addr;
/* is it in the first chunk? */
if (addr >= first_start && addr < first_start + pcpu_unit_size) {
if (pcpu_addr_in_first_chunk(addr)) {
/* is it in the reserved area? */
if (addr < first_start + pcpu_reserved_chunk_limit)
if (pcpu_addr_in_reserved_chunk(addr))
return pcpu_reserved_chunk;
return pcpu_first_chunk;
}
@ -1343,10 +1356,13 @@ bool is_kernel_percpu_address(unsigned long addr)
*/
phys_addr_t per_cpu_ptr_to_phys(void *addr)
{
if ((unsigned long)addr < VMALLOC_START ||
(unsigned long)addr >= VMALLOC_END)
return __pa(addr);
else
if (pcpu_addr_in_first_chunk(addr)) {
if ((unsigned long)addr < VMALLOC_START ||
(unsigned long)addr >= VMALLOC_END)
return __pa(addr);
else
return page_to_phys(vmalloc_to_page(addr));
} else
return page_to_phys(vmalloc_to_page(addr));
}