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a50b854e07
Patch series "Make working with compound pages easier", v2. These three patches add three helpers and convert the appropriate places to use them. This patch (of 3): It's unnecessarily hard to find out the size of a potentially huge page. Replace 'PAGE_SIZE << compound_order(page)' with page_size(page). Link: http://lkml.kernel.org/r/20190721104612.19120-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Based on arch/arm/mm/flush.c
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*
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* Copyright (C) 1995-2002 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*/
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <asm/cacheflush.h>
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#include <asm/cache.h>
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#include <asm/tlbflush.h>
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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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if (icache_is_aliasing()) {
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__clean_dcache_area_pou(kaddr, len);
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__flush_icache_all();
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} else {
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/*
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* Don't issue kick_all_cpus_sync() after I-cache invalidation
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* for user mappings.
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*/
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__flush_icache_range(addr, addr + len);
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}
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}
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static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
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unsigned long uaddr, void *kaddr,
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unsigned long len)
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{
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if (vma->vm_flags & VM_EXEC)
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sync_icache_aliases(kaddr, len);
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}
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/*
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* Copy user data from/to a page which is mapped into a different processes
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* address space. Really, we want to allow our "user space" model to handle
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* this.
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*/
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void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long uaddr, void *dst, const void *src,
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unsigned long len)
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{
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memcpy(dst, src, len);
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flush_ptrace_access(vma, page, uaddr, dst, len);
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}
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void __sync_icache_dcache(pte_t pte)
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{
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struct page *page = pte_page(pte);
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if (!test_and_set_bit(PG_dcache_clean, &page->flags))
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sync_icache_aliases(page_address(page), page_size(page));
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}
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EXPORT_SYMBOL_GPL(__sync_icache_dcache);
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/*
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* This function is called when a page has been modified by the kernel. Mark
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* it as dirty for later flushing when mapped in user space (if executable,
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* see __sync_icache_dcache).
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*/
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void flush_dcache_page(struct page *page)
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{
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if (test_bit(PG_dcache_clean, &page->flags))
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clear_bit(PG_dcache_clean, &page->flags);
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}
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EXPORT_SYMBOL(flush_dcache_page);
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/*
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* Additional functions defined in assembly.
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*/
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EXPORT_SYMBOL(__flush_icache_range);
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#ifdef CONFIG_ARCH_HAS_PMEM_API
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void arch_wb_cache_pmem(void *addr, size_t size)
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{
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/* Ensure order against any prior non-cacheable writes */
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dmb(osh);
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__clean_dcache_area_pop(addr, size);
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}
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EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
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void arch_invalidate_pmem(void *addr, size_t size)
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{
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__inval_dcache_area(addr, size);
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}
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EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
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#endif
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