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mm/page_ext: move functions around for minor cleanups to page_ext 

1. move page_ext_get and page_ext_put down to remove forward
   declaration of lookup_page_ext.

2. move page_ext_init_flatmem_late down to existing non SPARS block to
   remove a new non SPARS block and to keep code for non SPARS tight.

Link: https://lkml.kernel.org/r/20230714114749.1743032-4-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kemeng Shi 2023-07-14 19:47:49 +08:00 committed by Andrew Morton
parent 3c09be5a2b
commit eb0da7f6e0
1 changed files with 47 additions and 51 deletions
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98
mm/page_ext.c
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@ -90,7 +90,6 @@ static struct page_ext_operations *page_ext_ops[] __initdata = {
unsigned long page_ext_size;
static unsigned long total_usage;
static struct page_ext *lookup_page_ext(const struct page *page);
bool early_page_ext __meminitdata;
static int __init setup_early_page_ext(char *str)
@ -137,62 +136,16 @@ static void __init invoke_init_callbacks(void)
}
}
#ifndef CONFIG_SPARSEMEM
void __init page_ext_init_flatmem_late(void)
{
invoke_init_callbacks();
}
#endif
static inline struct page_ext *get_entry(void *base, unsigned long index)
{
return base + page_ext_size * index;
}
/**
* page_ext_get() - Get the extended information for a page.
* @page: The page we're interested in.
*
* Ensures that the page_ext will remain valid until page_ext_put()
* is called.
*
* Return: NULL if no page_ext exists for this page.
* Context: Any context. Caller may not sleep until they have called
* page_ext_put().
*/
struct page_ext *page_ext_get(struct page *page)
{
struct page_ext *page_ext;
rcu_read_lock();
page_ext = lookup_page_ext(page);
if (!page_ext) {
rcu_read_unlock();
return NULL;
}
return page_ext;
}
/**
* page_ext_put() - Working with page extended information is done.
* @page_ext: Page extended information received from page_ext_get().
*
* The page extended information of the page may not be valid after this
* function is called.
*
* Return: None.
* Context: Any context with corresponding page_ext_get() is called.
*/
void page_ext_put(struct page_ext *page_ext)
{
if (unlikely(!page_ext))
return;
rcu_read_unlock();
}
#ifndef CONFIG_SPARSEMEM
void __init page_ext_init_flatmem_late(void)
{
invoke_init_callbacks();
}
void __meminit pgdat_page_ext_init(struct pglist_data *pgdat)
{
@ -536,3 +489,46 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat)
}
#endif
/**
* page_ext_get() - Get the extended information for a page.
* @page: The page we're interested in.
*
* Ensures that the page_ext will remain valid until page_ext_put()
* is called.
*
* Return: NULL if no page_ext exists for this page.
* Context: Any context. Caller may not sleep until they have called
* page_ext_put().
*/
struct page_ext *page_ext_get(struct page *page)
{
struct page_ext *page_ext;
rcu_read_lock();
page_ext = lookup_page_ext(page);
if (!page_ext) {
rcu_read_unlock();
return NULL;
}
return page_ext;
}
/**
* page_ext_put() - Working with page extended information is done.
* @page_ext: Page extended information received from page_ext_get().
*
* The page extended information of the page may not be valid after this
* function is called.
*
* Return: None.
* Context: Any context with corresponding page_ext_get() is called.
*/
void page_ext_put(struct page_ext *page_ext)
{
if (unlikely(!page_ext))
return;
rcu_read_unlock();
}