powerpc: Per process DSCR + some fixes (try#4)

[pandora-kernel.git] / arch / powerpc / kernel / process.c

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index f74f355..a01c2d9 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -702,6 +702,8 @@ void prepare_to_copy(struct task_struct *tsk)
 /*
  * Copy a thread..
  */
+extern unsigned long dscr_default; /* defined in arch/powerpc/kernel/sysfs.c */
+
 int copy_thread(unsigned long clone_flags, unsigned long usp,
                unsigned long unused, struct task_struct *p,
                struct pt_regs *regs)
@@ -769,6 +771,20 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
                p->thread.ksp_vsid = sp_vsid;
        }
 #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;
+               }
+       }
+#endif
 
        /*
         * The PPC64 ABI makes use of a TOC to contain function