[PATCH v2 05/13] MIPS: make setup_zero_pages() use memblock

[Mike Rapoport]

From: "Mike Rapoport (Microsoft)" <r...@kernel.org>

Allocating the zero pages from memblock is simpler because the memory is
already reserved.

This will also help with pulling out memblock_free_all() to the generic
code and reducing code duplication in arch::mem_init().

Signed-off-by: Mike Rapoport (Microsoft) <r...@kernel.org>
---
 arch/mips/include/asm/mmzone.h |  2 --
 arch/mips/mm/init.c            | 18 +++++-------------
 2 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/arch/mips/include/asm/mmzone.h b/arch/mips/include/asm/mmzone.h
index 14226ea42036..602a21aee9d4 100644
--- a/arch/mips/include/asm/mmzone.h
+++ b/arch/mips/include/asm/mmzone.h
@@ -20,6 +20,4 @@
 #define nid_to_addrbase(nid) 0
 #endif
 
-extern void setup_zero_pages(void);
-
 #endif /* _ASM_MMZONE_H_ */
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 3db6082c611e..820e35a59d4d 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -59,24 +59,16 @@ EXPORT_SYMBOL(zero_page_mask);
 /*
  * Not static inline because used by IP27 special magic initialization code
  */
-void setup_zero_pages(void)
+static void __init setup_zero_pages(void)
 {
-       unsigned int order, i;
-       struct page *page;
+       unsigned int order;
 
        if (cpu_has_vce)
                order = 3;
        else
                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);
+       empty_zero_page = (unsigned long)memblock_alloc_or_panic(PAGE_SIZE << 
order, PAGE_SIZE);
 
        zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
 }
@@ -470,9 +462,9 @@ void __init mem_init(void)
        BUILD_BUG_ON(IS_ENABLED(CONFIG_32BIT) && (PFN_PTE_SHIFT > PAGE_SHIFT));
 
        maar_init();
-       memblock_free_all();
        setup_zero_pages();     /* Setup zeroed pages.  */
        mem_init_free_highmem();
+       memblock_free_all();
 
 #ifdef CONFIG_64BIT
        if ((unsigned long) &_text > (unsigned long) CKSEG0)
@@ -486,8 +478,8 @@ void __init mem_init(void)
 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 */
+       memblock_free_all();
 }
 #endif /* !CONFIG_NUMA */
 
-- 
2.47.2