[linuxsh-dev] [PATCH] Ensure flush_page_to_ram does

[Alex B. <ker...@be...>]

Hi,

The reason we where seeing issues with executing from hard disk was due
to cache behaviour. We fixed it by applying this patch:

--- ../../../linuxsh-2.4/include/asm-sh/pgtable.h       2003-04-10
17:19:24.000000000 +0100
+++ pgtable.h   2003-05-20 10:56:26.000000000 +0100
@@ -62,7 +62,7 @@
 extern void flush_icache_range(unsigned long start, unsigned long end);
 extern void flush_cache_sigtramp(unsigned long addr);
  
-#define flush_page_to_ram(page)                        do { } while (0)
+#define flush_page_to_ram(page)                       
flush_dcache_page(page)
 #define flush_icache_page(vma,pg)              do { } while (0)
  
 /* Initialization of P3 area for copy_user_page */

To ensure the data loaded from disk (with PIO) was properly cached in
the processor. We think this issue was avoided with booting from NFS
because of different cache behaviour when DMA is involved.

flush_page_to_ram is a deprecated function but thats something that
would need to be sorted out in the main tree. Comments?

-- 
Alex, homepage: http://www.bennee.com/~alex/

There are only two kinds of men -- the dead and the deadly.
		-- Helen Rowland