swap read ahead bug

[Roman Zippel]

Hi,

In do_swap_page() we don't flush read ahead pages to memory, so the cpu
might read the wrong data into the icache. I can reproduce this on my ppc
machine and the patch below fixes this problem.
If the patch is ok, you might also want to remove the wait_on_page() since
the following lock_page() implies this wait already.

bye, Roman

diff -u -r1.1.1.13 -r1.3
--- mm/memory.c	2001/07/08 15:05:26	1.1.1.13
+++ mm/memory.c	2001/07/08 17:12:37	1.3
@@ -1109,8 +1109,6 @@
 			return -1;
 		}
 		wait_on_page(page);
-		flush_page_to_ram(page);
-		flush_icache_page(vma, page);
 	}

 	/*
@@ -1140,6 +1138,8 @@
 		pte = pte_mkwrite(pte_mkdirty(pte));
 	UnlockPage(page);

+	flush_page_to_ram(page);
+	flush_icache_page(vma, page);
 	set_pte(page_table, pte);

 	/* No need to invalidate - it was non-present before */