microblaze: Fix copy_to_user_page macro

copy_to_user_page macro is used in mm/memory.c:access_process_vm
function. This function is called from ptrace code (POKETEXT, POKEDATA)
which write data to memory. Microblaze handle physical address for
caches that's why there is virt_to_phys conversion.

There is potential one location which can caused the problem on WB system.

The important is take a look at write PTRACEs requests
(POKE/TEXT, DATA, USR).

Note:
Majority of Microblaze PTRACE code is moved to generic location
in newer kernel version that's why this solution should work on
the newest kernel version too.

linux/io.h is in cacheflush because of mm/nommu.c

Tested on a WB system - hello world debugging.

Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/microblaze/include/asm/cacheflush.h b/arch/microblaze/include/asm/cacheflush.h
index e9bb567e1b0e..7ebd955460d9 100644
--- a/arch/microblaze/include/asm/cacheflush.h
+++ b/arch/microblaze/include/asm/cacheflush.h
@@ -103,8 +103,10 @@ do { \
 
 #define copy_to_user_page(vma, page, vaddr, dst, src, len)              \
 do {                                                                    \
+        u32 addr = virt_to_phys(dst);                                   \
+        invalidate_icache_range((unsigned) (addr), (unsigned) (addr) + (len));\
         memcpy((dst), (src), (len));                                    \
-        flush_icache_range((unsigned) (dst), (unsigned) (dst) + (len)); \
+        flush_dcache_range((unsigned) (addr), (unsigned) (addr) + (len));\
 } while (0)
 
 #define copy_from_user_page(vma, page, vaddr, dst, src, len)            \