s390: convert to generic kernel_execve()

same situation as with alpha and arm - only massage needed

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

1 files changed, 6 insertions, 24 deletions

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 24de1cd3754b..ef46f66bc0d6 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -355,30 +355,13 @@ ENTRY(kernel_thread_starter)
 # kernel_execve function needs to deal with pt_regs that is not
 # at the usual place
 #
-ENTRY(kernel_execve)
-        stm     %r12,%r15,48(%r15)
-        lr      %r14,%r15
-        l       %r13,__LC_SVC_NEW_PSW+4
-        ahi     %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
-        st      %r14,__SF_BACKCHAIN(%r15)
-        la      %r12,STACK_FRAME_OVERHEAD(%r15)
-        xc      0(__PT_SIZE,%r12),0(%r12)
-        l       %r1,BASED(.Ldo_execve)
-        lr      %r5,%r12
-        basr    %r14,%r1                # call do_execve
-        ltr     %r2,%r2
-        je      0f
-        ahi     %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE)
-        lm      %r12,%r15,48(%r15)
-        br      %r14
-        # execve succeeded.
-0:      ssm     __LC_PGM_NEW_PSW        # disable I/O and ext. interrupts
-        l       %r15,__LC_KERNEL_STACK  # load ksp
-        ahi     %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
-        la      %r11,STACK_FRAME_OVERHEAD(%r15)
-        mvc     0(__PT_SIZE,%r11),0(%r12)       # copy pt_regs
-        l       %r12,__LC_THREAD_INFO
+ENTRY(ret_from_kernel_execve)
+        ssm     __LC_PGM_NEW_PSW        # disable I/O and ext. interrupts
+        lr      %r15,%r2
+        lr      %r11,%r2
+        ahi     %r15,-STACK_FRAME_OVERHEAD
         xc      __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
+        l       %r12,__LC_THREAD_INFO
         ssm     __LC_SVC_NEW_PSW        # reenable interrupts
         j       sysc_return
 
@@ -941,7 +924,6 @@ cleanup_idle_wait:
 .Ldo_signal:            .long   do_signal
 .Ldo_notify_resume:     .long   do_notify_resume
 .Ldo_per_trap:          .long   do_per_trap
-.Ldo_execve:            .long   do_execve
 .Ljump_table:           .long   pgm_check_table
 .Lschedule:             .long   schedule
 #ifdef CONFIG_PREEMPT