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https://github.com/torvalds/linux
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981bbf274b
In our stress test, we found some crash problem caused by: if (!(vma->vm_flags & VM_EXEC)) return; in update_mmu_cache(). Seems current update_mmu_cache implementation is wrong and we retread to the conservative implementation. Also the usage of kmap_atomic in update_mmu_cache is risky, page-virtual may be scheduled out and changed, so we must use preempt_disable & pagefault_disable which is called by kmap_atomic(). Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/cache.h>
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#include <linux/highmem.h>
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#include <linux/mm.h>
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#include <asm/cache.h>
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void flush_icache_page(struct vm_area_struct *vma, struct page *page)
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{
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unsigned long start;
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start = (unsigned long) kmap_atomic(page);
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cache_wbinv_range(start, start + PAGE_SIZE);
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kunmap_atomic((void *)start);
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}
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void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
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unsigned long vaddr, int len)
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{
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unsigned long kaddr;
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kaddr = (unsigned long) kmap_atomic(page) + (vaddr & ~PAGE_MASK);
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cache_wbinv_range(kaddr, kaddr + len);
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kunmap_atomic((void *)kaddr);
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}
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void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
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pte_t *pte)
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{
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unsigned long addr, pfn;
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struct page *page;
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pfn = pte_pfn(*pte);
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if (unlikely(!pfn_valid(pfn)))
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return;
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page = pfn_to_page(pfn);
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if (page == ZERO_PAGE(0))
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return;
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addr = (unsigned long) kmap_atomic(page);
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cache_wbinv_range(addr, addr + PAGE_SIZE);
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kunmap_atomic((void *) addr);
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}
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