Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

[~andy/linux] / arch / parisc / kernel / cache.c

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index a72545554a3154c254eace0648a769d4df645b25..ac87a40502e6f6a0e11d21eaf6789259859ad092 100644 (file)
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -388,6 +388,20 @@ void flush_kernel_dcache_page_addr(void *addr)
 }
 EXPORT_SYMBOL(flush_kernel_dcache_page_addr);
 
+void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
+       struct page *pg)
+{
+       /* Copy using kernel mapping.  No coherency is needed (all in
+         kunmap) for the `to' page.  However, the `from' page needs to
+         be flushed through a mapping equivalent to the user mapping
+         before it can be accessed through the kernel mapping. */
+       preempt_disable();
+       flush_dcache_page_asm(__pa(vfrom), vaddr);
+       preempt_enable();
+       copy_page_asm(vto, vfrom);
+}
+EXPORT_SYMBOL(copy_user_page);
+
 void purge_tlb_entries(struct mm_struct *mm, unsigned long addr)
 {
        unsigned long flags;