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arm64: mm: Separate out vmemmap

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vmemmap is a preprocessor definition that depends on a variable,
memstart_addr. In a later patch we will need to expand the size of
the VMEMMAP region and optionally modify vmemmap depending upon
whether or not hardware support is available for 52-bit virtual
addresses.

This patch changes vmemmap to be a variable. As the old definition
depended on a variable load, this should not affect performance
noticeably.

Signed-off-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Steve Capper 2019-08-07 16:55:20 +01:00 committed by Will Deacon
parent c812026c54
commit c8b6d2ccf9
2 changed files with 7 additions and 2 deletions
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4
arch/arm64/include/asm/pgtable.h
View File

@ -23,8 +23,6 @@
#define VMALLOC_START (MODULES_END)
#define VMALLOC_END (- PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
#define vmemmap ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT))
#define FIRST_USER_ADDRESS 0UL
#ifndef __ASSEMBLY__
@ -35,6 +33,8 @@
#include <linux/mm_types.h>
#include <linux/sched.h>
extern struct page *vmemmap;
extern void __pte_error(const char *file, int line, unsigned long val);
extern void __pmd_error(const char *file, int line, unsigned long val);
extern void __pud_error(const char *file, int line, unsigned long val);

5
arch/arm64/mm/init.c
View File

@ -53,6 +53,9 @@ EXPORT_SYMBOL(memstart_addr);
s64 physvirt_offset __ro_after_init;
EXPORT_SYMBOL(physvirt_offset);
struct page *vmemmap __ro_after_init;
EXPORT_SYMBOL(vmemmap);
phys_addr_t arm64_dma_phys_limit __ro_after_init;
#ifdef CONFIG_KEXEC_CORE
@ -320,6 +323,8 @@ void __init arm64_memblock_init(void)
physvirt_offset = PHYS_OFFSET - PAGE_OFFSET;
vmemmap = ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT));
/*
* Remove the memory that we will not be able to cover with the
* linear mapping. Take care not to clip the kernel which may be