1 files changed, 26 insertions, 24 deletions

diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 84c29111756c..8430f45daea6 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -214,9 +214,10 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
         /*
          * Copy the callee-saved registers from the passed pt_regs struct
          * into the context-switch callee-saved registers area.
-         * We have to restore the callee-saved registers since we may
-         * be cloning a userspace task with userspace register state,
-         * and we won't be unwinding the same kernel frames to restore them.
+         * This way when we start the interrupt-return sequence, the
+         * callee-save registers will be correctly in registers, which
+         * is how we assume the compiler leaves them as we start doing
+         * the normal return-from-interrupt path after calling C code.
          * Zero out the C ABI save area to mark the top of the stack.
          */
         ksp = (unsigned long) childregs;
@@ -304,15 +305,25 @@ int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
 /* Allow user processes to access the DMA SPRs */
 void grant_dma_mpls(void)
 {
+#if CONFIG_KERNEL_PL == 2
+        __insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1);
+        __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1);
+#else
         __insn_mtspr(SPR_MPL_DMA_CPL_SET_0, 1);
         __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_0, 1);
+#endif
 }
 
 /* Forbid user processes from accessing the DMA SPRs */
 void restrict_dma_mpls(void)
 {
+#if CONFIG_KERNEL_PL == 2
+        __insn_mtspr(SPR_MPL_DMA_CPL_SET_2, 1);
+        __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_2, 1);
+#else
         __insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1);
         __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1);
+#endif
 }
 
 /* Pause the DMA engine, then save off its state registers. */
@@ -523,19 +534,14 @@ struct task_struct *__sched _switch_to(struct task_struct *prev,
          * Switch kernel SP, PC, and callee-saved registers.
          * In the context of the new task, return the old task pointer
          * (i.e. the task that actually called __switch_to).
-         * Pass the value to use for SYSTEM_SAVE_1_0 when we reset our sp.
+         * Pass the value to use for SYSTEM_SAVE_K_0 when we reset our sp.
          */
         return __switch_to(prev, next, next_current_ksp0(next));
 }
 
-long _sys_fork(struct pt_regs *regs)
-{
-        return do_fork(SIGCHLD, regs->sp, regs, 0, NULL, NULL);
-}
-
-long _sys_clone(unsigned long clone_flags, unsigned long newsp,
-                void __user *parent_tidptr, void __user *child_tidptr,
-                struct pt_regs *regs)
+SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
+                void __user *, parent_tidptr, void __user *, child_tidptr,
+                struct pt_regs *, regs)
 {
         if (!newsp)
                 newsp = regs->sp;
@@ -543,18 +549,13 @@ long _sys_clone(unsigned long clone_flags, unsigned long newsp,
                        parent_tidptr, child_tidptr);
 }
 
-long _sys_vfork(struct pt_regs *regs)
-{
-        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->sp,
-                       regs, 0, NULL, NULL);
-}
-
 /*
  * sys_execve() executes a new program.
  */
-long _sys_execve(const char __user *path,
-                 const char __user *const __user *argv,
-                 const char __user *const __user *envp, struct pt_regs *regs)
+SYSCALL_DEFINE4(execve, const char __user *, path,
+                const char __user *const __user *, argv,
+                const char __user *const __user *, envp,
+                struct pt_regs *, regs)
 {
         long error;
         char *filename;
@@ -570,9 +571,10 @@ out:
 }
 
 #ifdef CONFIG_COMPAT
-long _compat_sys_execve(const char __user *path,
-                        const compat_uptr_t __user *argv,
-                        const compat_uptr_t __user *envp, struct pt_regs *regs)
+long compat_sys_execve(const char __user *path,
+                       const compat_uptr_t __user *argv,
+                       const compat_uptr_t __user *envp,
+                       struct pt_regs *regs)
 {
         long error;
         char *filename;