diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-09-10 18:03:41 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-09-30 23:03:03 -0400 |
| commit | 37fe5d41f6403b0ea84c1586548bf1b03f834af0 (patch) | |
| tree | 37e404af54f246a686dba85099187415591cde9d /arch/s390/kernel/entry64.S | |
| parent | 65f22a906e154e8086ed561904d09c3586de85f4 (diff) | |
| download | op-kernel-dev-37fe5d41f6403b0ea84c1586548bf1b03f834af0.zip op-kernel-dev-37fe5d41f6403b0ea84c1586548bf1b03f834af0.tar.gz | |
s390: fold kernel_thread_helper() into ret_from_fork()
... and don't bother with syscall return path in case of kernel
threads.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/s390/kernel/entry64.S')
| -rw-r--r-- | arch/s390/kernel/entry64.S | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 1f776f2..39c84e6 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -352,12 +352,22 @@ ENTRY(ret_from_fork) la %r11,STACK_FRAME_OVERHEAD(%r15) lg %r12,__LC_THREAD_INFO tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? - jo 0f - stg %r15,__PT_R15(%r11) # store stack pointer for new kthread -0: brasl %r14,schedule_tail + je 1f + brasl %r14,schedule_tail TRACE_IRQS_ON ssm __LC_SVC_NEW_PSW # reenable interrupts j sysc_tracenogo +1: # it's a kernel thread + stg %r15,__PT_R15(%r11) # store stack pointer for new kthread + brasl %r14,schedule_tail + TRACE_IRQS_ON + ssm __LC_SVC_NEW_PSW # reenable interrupts + lmg %r9,%r11,__PT_R9(%r11) # load gprs +ENTRY(kernel_thread_starter) + la %r2,0(%r10) + basr %r14,%r9 + la %r2,0 + br %r11 # do_exit # # kernel_execve function needs to deal with pt_regs that is not |
