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RISC-V: fix virtual address overlapped in FIXADDR_START and VMEMMAP_START 

This patch fixes the virtual address layout in pgtable.h.  The virtual
address of FIXADDR_START and VMEMMAP_START should not be overlapped.

Fixes: d95f1a542c ("RISC-V: Implement sparsemem")
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
[paul.walmsley@sifive.com: fixed patch description]
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Greentime Hu 2019-10-08 14:45:24 +08:00 committed by Paul Walmsley
parent 4c8eb19cf9
commit 5bf4e52ff0
1 changed files with 8 additions and 8 deletions
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16
arch/riscv/include/asm/pgtable.h
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@ -87,14 +87,6 @@ extern pgd_t swapper_pg_dir[];
#define VMALLOC_END (PAGE_OFFSET - 1)
#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
#define FIXADDR_TOP VMALLOC_START
#ifdef CONFIG_64BIT
#define FIXADDR_SIZE PMD_SIZE
#else
#define FIXADDR_SIZE PGDIR_SIZE
#endif
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
/*
* Roughly size the vmemmap space to be large enough to fit enough
* struct pages to map half the virtual address space. Then
@ -108,6 +100,14 @@ extern pgd_t swapper_pg_dir[];
#define vmemmap ((struct page *)VMEMMAP_START)
#define FIXADDR_TOP (VMEMMAP_START)
#ifdef CONFIG_64BIT
#define FIXADDR_SIZE PMD_SIZE
#else
#define FIXADDR_SIZE PGDIR_SIZE
#endif
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
/*
* ZERO_PAGE is a global shared page that is always zero,
* used for zero-mapped memory areas, etc.