Use page->lru.next to implement the singly linked list of pages rather
than the struct deferred_page which needs to be allocated and freed for
each page.
Signed-off-by: Nick Piggin <[email protected]>
Acked-by: Andi Kleen <[email protected]>
Index: linux-2.6/arch/x86_64/mm/pageattr.c
===================================================================
--- linux-2.6.orig/arch/x86_64/mm/pageattr.c
+++ linux-2.6/arch/x86_64/mm/pageattr.c
@@ -77,26 +77,12 @@ static inline void flush_map(unsigned lo
on_each_cpu(flush_kernel_map, (void *)address, 1, 1);
}
-struct deferred_page {
- struct deferred_page *next;
- struct page *fpage;
- unsigned long address;
-};
-static struct deferred_page *df_list; /* protected by init_mm.mmap_sem */
+static struct page *deferred_pages; /* protected by init_mm.mmap_sem */
-static inline void save_page(unsigned long address, struct page *fpage)
+static inline void save_page(struct page *fpage)
{
- struct deferred_page *df;
- df = kmalloc(sizeof(struct deferred_page), GFP_KERNEL);
- if (!df) {
- flush_map(address);
- __free_page(fpage);
- } else {
- df->next = df_list;
- df->fpage = fpage;
- df->address = address;
- df_list = df;
- }
+ fpage->lru.next = (struct list_head *)deferred_pages;
+ deferred_pages = fpage;
}
/*
@@ -163,7 +149,7 @@ __change_page_attr(unsigned long address
switch (page_count(kpte_page)) {
case 1:
- save_page(address, kpte_page);
+ save_page(kpte_page);
revert_page(address, ref_prot);
break;
case 0:
@@ -220,17 +206,16 @@ int change_page_attr(struct page *page,
void global_flush_tlb(void)
{
- struct deferred_page *df, *next_df;
+ struct page *dpage;
down_read(&init_mm.mmap_sem);
- df = xchg(&df_list, NULL);
+ dpage = xchg(&deferred_pages, NULL);
up_read(&init_mm.mmap_sem);
- flush_map((df && !df->next) ? df->address : 0);
- for (; df; df = next_df) {
- next_df = df->next;
- if (df->fpage)
- __free_page(df->fpage);
- kfree(df);
+
+ flush_map((dpage && !dpage->lru.next) ? (unsigned long)page_address(dpage) : 0);
+ while (dpage) {
+ __free_page(dpage);
+ dpage = (struct page *)dpage->lru.next;
}
}
-
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