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Viewing changes to arch/arm/mm/flush.c

  • Committer: Package Import Robot
  • Author(s): Paolo Pisati, Paolo Pisati
  • Date: 2013-07-11 18:35:20 UTC
  • Revision ID: package-import@ubuntu.com-20130711183520-htnf1x4y5r11hndr
Tags: 3.5.0-229.42
https://launchpad.net/bugs/1199276
* Release Tracking Bug
  - LP: #1199276

[ Paolo Pisati ]

* [Config] CONFIG_ATH9K_LEGACY_RATE_CONTROL is not set

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arch/arm/mm/flush.c
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EXPORT_SYMBOL(flush_dcache_page);
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/*
 
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 * Ensure cache coherency for the kernel mapping of this page. We can
 
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 * assume that the page is pinned via kmap.
 
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 *
 
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 * If the page only exists in the page cache and there are no user
 
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 * space mappings, this is a no-op since the page was already marked
 
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 * dirty at creation.  Otherwise, we need to flush the dirty kernel
 
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 * cache lines directly.
 
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 */
 
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void flush_kernel_dcache_page(struct page *page)
 
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{
 
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        if (cache_is_vivt() || cache_is_vipt_aliasing()) {
 
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                struct address_space *mapping;
 
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                mapping = page_mapping(page);
 
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                if (!mapping || mapping_mapped(mapping)) {
 
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                        void *addr;
 
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                        addr = page_address(page);
 
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                        /*
 
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                         * kmap_atomic() doesn't set the page virtual
 
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                         * address for highmem pages, and
 
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                         * kunmap_atomic() takes care of cache
 
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                         * flushing already.
 
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                         */
 
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                        if (!IS_ENABLED(CONFIG_HIGHMEM) || addr)
 
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                                __cpuc_flush_dcache_area(addr, PAGE_SIZE);
 
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                }
 
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        }
 
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}
 
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EXPORT_SYMBOL(flush_kernel_dcache_page);
 
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/*
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 * Flush an anonymous page so that users of get_user_pages()
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 * can safely access the data.  The expected sequence is:
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 *