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authorBibo Mao <maobibo@loongson.cn>2023-09-06 22:53:10 +0800
committerHuacai Chen <chenhuacai@loongson.cn>2023-09-06 22:53:10 +0800
commit0921af6ccfb37dc2d6aefcf744333c14e7ca739d (patch)
tree4bdb59dc579e6b2a98fe02142261a629cb22469d /arch/loongarch
parent2bb20d2926a8ea991386315aa8017990ef7beb6a (diff)
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LoongArch: Use static defined zero page rather than allocated
On LoongArch system, there is only one page needed for zero page (no cache synonyms), and there is no COLOR_ZERO_PAGE, so zero_page_mask is useless and the macro __HAVE_COLOR_ZERO_PAGE is not necessary. Like other popular architectures, It is simpler to define the zero page in kernel BSS code segment rather than dynamically allocate. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch')
-rw-r--r--arch/loongarch/include/asm/mmzone.h2
-rw-r--r--arch/loongarch/include/asm/pgtable.h7
-rw-r--r--arch/loongarch/kernel/numa.c1
-rw-r--r--arch/loongarch/mm/init.c28
4 files changed, 3 insertions, 35 deletions
diff --git a/arch/loongarch/include/asm/mmzone.h b/arch/loongarch/include/asm/mmzone.h
index fe67d0b4b33d..2b9a90727e19 100644
--- a/arch/loongarch/include/asm/mmzone.h
+++ b/arch/loongarch/include/asm/mmzone.h
@@ -13,6 +13,4 @@ extern struct pglist_data *node_data[];
#define NODE_DATA(nid) (node_data[(nid)])
-extern void setup_zero_pages(void);
-
#endif /* _ASM_MMZONE_H_ */
diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
index 0ac6afa4a825..7699af049443 100644
--- a/arch/loongarch/include/asm/pgtable.h
+++ b/arch/loongarch/include/asm/pgtable.h
@@ -70,12 +70,9 @@ struct vm_area_struct;
* for zero-mapped memory areas etc..
*/
-extern unsigned long empty_zero_page;
-extern unsigned long zero_page_mask;
+extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
-#define ZERO_PAGE(vaddr) \
- (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
-#define __HAVE_COLOR_ZERO_PAGE
+#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
/*
* TLB refill handlers may also map the vmalloc area into xkvrange.
diff --git a/arch/loongarch/kernel/numa.c b/arch/loongarch/kernel/numa.c
index cb00804826f7..c7d33c489e04 100644
--- a/arch/loongarch/kernel/numa.c
+++ b/arch/loongarch/kernel/numa.c
@@ -438,7 +438,6 @@ void __init mem_init(void)
{
high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
memblock_free_all();
- setup_zero_pages(); /* This comes from node 0 */
}
int pcibus_to_node(struct pci_bus *bus)
diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c
index 0f1dee285da2..f3fe8c06ba4d 100644
--- a/arch/loongarch/mm/init.c
+++ b/arch/loongarch/mm/init.c
@@ -35,33 +35,8 @@
#include <asm/pgalloc.h>
#include <asm/tlb.h>
-/*
- * We have up to 8 empty zeroed pages so we can map one of the right colour
- * when needed. Since page is never written to after the initialization we
- * don't have to care about aliases on other CPUs.
- */
-unsigned long empty_zero_page, zero_page_mask;
+unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);
-EXPORT_SYMBOL(zero_page_mask);
-
-void setup_zero_pages(void)
-{
- unsigned int order, i;
- struct page *page;
-
- order = 0;
-
- empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
- if (!empty_zero_page)
- panic("Oh boy, that early out of memory?");
-
- page = virt_to_page((void *)empty_zero_page);
- split_page(page, order);
- for (i = 0; i < (1 << order); i++, page++)
- mark_page_reserved(page);
-
- zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
-}
void copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma)
@@ -106,7 +81,6 @@ void __init mem_init(void)
high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
memblock_free_all();
- setup_zero_pages(); /* Setup zeroed pages. */
}
#endif /* !CONFIG_NUMA */