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arm64: memory: Rewrite default page_to_virt()/virt_to_page() 

The default implementations of page_to_virt() and virt_to_page() are
fairly confusing to read and the former evaluates its 'page' parameter
twice in the macro

Rewrite them so that the computation is expressed as 'base + index' in
both cases and the parameter is always evaluated exactly once.

Tested-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
alistair/sunxi64-5.4-dsi
Will Deacon 2019-08-13 16:46:11 +01:00
parent 577c2b3528
commit 96628f0fb1
1 changed files with 10 additions and 11 deletions
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21
arch/arm64/include/asm/memory.h
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@ -313,19 +313,18 @@ static inline void *phys_to_virt(phys_addr_t x)
#if !defined(CONFIG_SPARSEMEM_VMEMMAP) || defined(CONFIG_DEBUG_VIRTUAL)
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#else
#define __virt_to_pgoff(kaddr) (((u64)(kaddr) - PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
#define __page_to_voff(kaddr) (((u64)(kaddr) - VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
#define page_to_virt(page) ({ \
unsigned long __addr = \
((__page_to_voff(page)) + PAGE_OFFSET); \
const void *__addr_tag = \
__tag_set((void *)__addr, page_kasan_tag(page)); \
((void *)__addr_tag); \
#define page_to_virt(x) ({ \
__typeof__(x) __page = x; \
u64 __idx = ((u64)__page - VMEMMAP_START) / sizeof(struct page);\
u64 __addr = PAGE_OFFSET + (__idx * PAGE_SIZE); \
(void *)__tag_set((const void *)__addr, page_kasan_tag(__page));\
})
#define virt_to_page(vaddr) \
((struct page *)((__virt_to_pgoff(__tag_reset(vaddr))) + VMEMMAP_START))
#define virt_to_page(x) ({ \
u64 __idx = (__tag_reset((u64)x) - PAGE_OFFSET) / PAGE_SIZE; \
u64 __addr = VMEMMAP_START + (__idx * sizeof(struct page)); \
(struct page *)__addr; \
})
#endif
#define virt_addr_valid(addr) ({ \