powerpc: Fix DSCR inheritance in copy_thread()

If the default DSCR is non zero we set thread.dscr_inherit in
copy_thread() meaning the new thread and all its children will ignore
future updates to the default DSCR. This is not intended and is
a change in behaviour that a number of our users have hit.

We just need to inherit thread.dscr and thread.dscr_inherit from
the parent which ends up being much simpler.

This was found with the following test case:

http://ozlabs.org/~anton/junkcode/dscr_default_test.c

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: <stable@kernel.org> # 3.0+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 710f400..1a1f2dd 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -802,16 +802,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 #endif /* CONFIG_PPC_STD_MMU_64 */
 #ifdef CONFIG_PPC64 
        if (cpu_has_feature(CPU_FTR_DSCR)) {
-               if (current->thread.dscr_inherit) {
-                       p->thread.dscr_inherit = 1;
-                       p->thread.dscr = current->thread.dscr;
-               } else if (0 != dscr_default) {
-                       p->thread.dscr_inherit = 1;
-                       p->thread.dscr = dscr_default;
-               } else {
-                       p->thread.dscr_inherit = 0;
-                       p->thread.dscr = 0;
-               }
+               p->thread.dscr_inherit = current->thread.dscr_inherit;
+               p->thread.dscr = current->thread.dscr;
        }
 #endif