ARC: entry.S: move some code around for cache locality in return path

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/kernel/entry-compact.S b/arch/arc/kernel/entry-compact.S
index bf611ec9a0174bcf9cbccb15296db3550d8100fb..abc62cd10a8c2f93601704b8cb99e0ec400ef649 100644 (file)
--- a/arch/arc/kernel/entry-compact.S
+++ b/arch/arc/kernel/entry-compact.S
@@ -391,3 +391,5 @@ not_level1_interrupt:
        EXCEPTION_EPILOGUE
 debug_marker_syscall:
        rtie
+
+END(ret_from_exception)

diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S
index 75cdc56351d913671e7fc8e1c1b853a1c4fc007f..603266eb75e11362e3e58f2fc62e2e03b21db797 100644 (file)
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -24,6 +24,55 @@
  *------------------------------------------------------------------
  */
 
+;################### Special Sys Call Wrappers ##########################
+
+ENTRY(sys_clone_wrapper)
+       SAVE_CALLEE_SAVED_USER
+       bl  @sys_clone
+       DISCARD_CALLEE_SAVED_USER
+
+       GET_CURR_THR_INFO_FLAGS   r10
+       btst r10, TIF_SYSCALL_TRACE
+       bnz  tracesys_exit
+
+       b ret_from_system_call
+END(sys_clone_wrapper)
+
+ENTRY(ret_from_fork)
+       ; when the forked child comes here from the __switch_to function
+       ; r0 has the last task pointer.
+       ; put last task in scheduler queue
+       bl   @schedule_tail
+
+       ld   r9, [sp, PT_status32]
+       brne r9, 0, 1f
+
+       jl.d [r14]              ; kernel thread entry point
+       mov  r0, r13            ; (see PF_KTHREAD block in copy_thread)
+
+1:
+       ; Return to user space
+       ; 1. Any forked task (Reach here via BRne above)
+       ; 2. First ever init task (Reach here via return from JL above)
+       ;    This is the historic "kernel_execve" use-case, to return to init
+       ;    user mode, in a round about way since that is always done from
+       ;    a kernel thread which is executed via JL above but always returns
+       ;    out whenever kernel_execve (now inline do_fork()) is involved
+       b    ret_from_exception
+END(ret_from_fork)
+
+#ifdef CONFIG_ARC_DW2_UNWIND
+; Workaround for bug 94179 (STAR ):
+; Despite -fasynchronous-unwind-tables, linker is not making dwarf2 unwinder
+; section (.debug_frame) as loadable. So we force it here.
+; This also fixes STAR 9000487933 where the prev-workaround (objcopy --setflag)
+; would not work after a clean build due to kernel build system dependencies.
+.section .debug_frame, "wa",@progbits
+
+; Reset to .text as this file is included in entry-<isa>.S
+.section .text, "ax",@progbits
+#endif
+
 ;################### Non TLB Exception Handling #############################
 
 ; ---------------------------------------------
@@ -338,53 +387,6 @@ resume_kernel_mode:
 #endif
 
        b       .Lrestore_regs
-END(ret_from_exception)
-
-ENTRY(ret_from_fork)
-       ; when the forked child comes here from the __switch_to function
-       ; r0 has the last task pointer.
-       ; put last task in scheduler queue
-       bl   @schedule_tail
-
-       ld   r9, [sp, PT_status32]
-       brne r9, 0, 1f
-
-       jl.d [r14]              ; kernel thread entry point
-       mov  r0, r13            ; (see PF_KTHREAD block in copy_thread)
-
-1:
-       ; Return to user space
-       ; 1. Any forked task (Reach here via BRne above)
-       ; 2. First ever init task (Reach here via return from JL above)
-       ;    This is the historic "kernel_execve" use-case, to return to init
-       ;    user mode, in a round about way since that is always done from
-       ;    a kernel thread which is executed via JL above but always returns
-       ;    out whenever kernel_execve (now inline do_fork()) is involved
-       b    ret_from_exception
-END(ret_from_fork)
 
-;################### Special Sys Call Wrappers ##########################
-
-ENTRY(sys_clone_wrapper)
-       SAVE_CALLEE_SAVED_USER
-       bl  @sys_clone
-       DISCARD_CALLEE_SAVED_USER
-
-       GET_CURR_THR_INFO_FLAGS   r10
-       btst r10, TIF_SYSCALL_TRACE
-       bnz  tracesys_exit
-
-       b ret_from_system_call
-END(sys_clone_wrapper)
-
-#ifdef CONFIG_ARC_DW2_UNWIND
-; Workaround for bug 94179 (STAR ):
-; Despite -fasynchronous-unwind-tables, linker is not making dwarf2 unwinder
-; section (.debug_frame) as loadable. So we force it here.
-; This also fixes STAR 9000487933 where the prev-workaround (objcopy --setflag)
-; would not work after a clean build due to kernel build system dependencies.
-.section .debug_frame, "wa",@progbits
+##### DONT ADD CODE HERE - .Lrestore_regs actually follows in entry-<isa>.S
 
-; Reset to .text as this file is included in entry-<isa>.S
-.section .text, "ax",@progbits
-#endif