alpha: switch to generic kernel_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 10 insertions, 47 deletions

diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index 61ff145cab6e..421dccf273eb 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -609,59 +609,22 @@ ret_from_fork:
 .end ret_from_fork
 
 /*
- * kernel_thread(fn, arg, clone_flags)
+ * ... and new kernel threads - here
  */
         .align 4
-        .globl  kernel_thread
-        .ent    kernel_thread
-kernel_thread:
-        /* We can be called from a module.  */
-        ldgp    $gp, 0($27)
-        .prologue 1
-        subq    $sp, SP_OFF+6*8, $sp
-        br      $1, 2f          /* load start address */
-
-        /* We've now "returned" from a fake system call.  */
-        unop
-        blt     $0, 1f          /* error?  */
-        ldi     $1, 0x3fff
-        beq     $20, 1f         /* parent or child?  */
-
-        bic     $sp, $1, $8     /* in child.  */
-        jsr     $26, ($27)
+        .globl  ret_from_kernel_thread
+        .ent    ret_from_kernel_thread
+ret_from_kernel_thread:
+        mov     $17, $16
+        jsr     $26, schedule_tail
+        mov     $9, $27
+        mov     $10, $16
+        jsr     $26, ($9)
         ldgp    $gp, 0($26)
         mov     $0, $16
         mov     $31, $26
         jmp     $31, sys_exit
-
-1:      ret                     /* in parent.  */
-
-        .align 4
-2:      /* Fake a system call stack frame, as we can't do system calls
-           from kernel space.  Note that we store FN and ARG as they
-           need to be set up in the child for the call.  Also store $8
-           and $26 for use in the parent.  */
-        stq     $31, SP_OFF($sp)        /* ps */
-        stq     $1, SP_OFF+8($sp)       /* pc */
-        stq     $gp, SP_OFF+16($sp)     /* gp */
-        stq     $16, 136($sp)           /* $27; FN for child */
-        stq     $17, SP_OFF+24($sp)     /* $16; ARG for child */
-        stq     $8, 64($sp)             /* $8 */
-        stq     $26, 128($sp)           /* $26 */
-        /* Avoid the HAE being gratuitously wrong, to avoid restoring it.  */
-        ldq     $2, alpha_mv+HAE_CACHE
-        stq     $2, 152($sp)            /* HAE */
-
-        /* Shuffle FLAGS to the front; add CLONE_VM.  */
-        ldi     $1, CLONE_VM|CLONE_UNTRACED
-        or      $18, $1, $16
-        bsr     $26, sys_clone
-
-        /* We don't actually care for a3 success widgetry in the kernel.
-           Not for positive errno values.  */
-        stq     $0, 0($sp)              /* $0 */
-        br      ret_to_kernel
-.end kernel_thread
+.end ret_from_kernel_thread
 
 
 /*