patch-2.4.19 linux-2.4.19/Documentation/cachetlb.txt

• Lines: 22
• Date: Fri Aug 2 17:39:42 2002
• Orig file: linux-2.4.18/Documentation/cachetlb.txt
• Orig date: Fri Dec 21 09:41:53 2001

diff -urN linux-2.4.18/Documentation/cachetlb.txt linux-2.4.19/Documentation/cachetlb.txt
@@ -339,7 +339,18 @@
 	If the icache does not snoop stores then this routine will need
 	to flush it.
 
+  void flush_icache_user_range(struct vm_area_struct *vma,
+			struct page *page, unsigned long addr, int len)
+	This is called when the kernel stores into addresses that are
+	part of the address space of a user process (which may be some
+	other process than the current process).  The addr argument
+	gives the virtual address in that process's address space,
+	page is the page which is being modified, and len indicates
+	how many bytes have been modified.  The modified region must
+	not cross a page boundary.  Currently this is only called from
+	kernel/ptrace.c.
+
   void flush_icache_page(struct vm_area_struct *vma, struct page *page)
-	All the functionality of flush_icache_page can be implemented in
-	flush_dcache_page and update_mmu_cache. In 2.5 the hope is to
-	remove this interface completely.
+	This is called when a page-cache page is about to be mapped
+	into a user process' address space.  It offers an opportunity
+	for a port to ensure d-cache/i-cache coherency if necessary.