arm64: Remove I-cache invalidation from flush_cache_range()
The flush_cache_range() function (similarly for flush_cache_page()) is called when the kernel is changing an existing VA->PA mapping range to either a new PA or to different attributes. Since ARMv8 has PIPT-like D-caches, this function does not need to perform any D-cache maintenance. The I-cache maintenance is already handled via set_pte_at() and flush_cache_range() cannot anyway guarantee that there are no cache lines left after invalidation due to the speculative loads. This patch makes flush_cache_range() a no-op. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -65,7 +65,6 @@
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* - kaddr - page address
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* - size - region size
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*/
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extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
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extern void flush_icache_range(unsigned long start, unsigned long end);
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extern void __flush_dcache_area(void *addr, size_t len);
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extern void __clean_dcache_area_poc(void *addr, size_t len);
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@ -82,6 +81,11 @@ static inline void flush_cache_page(struct vm_area_struct *vma,
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{
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}
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static inline void flush_cache_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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}
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/*
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* Cache maintenance functions used by the DMA API. No to be used directly.
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*/
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@ -25,13 +25,6 @@
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#include <asm/cachetype.h>
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#include <asm/tlbflush.h>
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void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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if (vma->vm_flags & VM_EXEC)
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__flush_icache_all();
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}
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void sync_icache_aliases(void *kaddr, unsigned long len)
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{
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unsigned long addr = (unsigned long)kaddr;
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