diff options
author | Bibo Mao <maobibo@loongson.cn> | 2023-09-06 17:53:10 +0300 |
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committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-09-06 17:53:10 +0300 |
commit | 0921af6ccfb37dc2d6aefcf744333c14e7ca739d (patch) | |
tree | 4bdb59dc579e6b2a98fe02142261a629cb22469d /arch/loongarch/mm | |
parent | 2bb20d2926a8ea991386315aa8017990ef7beb6a (diff) | |
download | linux-0921af6ccfb37dc2d6aefcf744333c14e7ca739d.tar.xz |
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/mm')
-rw-r--r-- | arch/loongarch/mm/init.c | 28 |
1 files changed, 1 insertions, 27 deletions
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 */ |