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/entry.S | |
| parent | s390: fold execve_tail() into start_thread(), convert to generic sys_execve() (diff) | |
| download | linux-dev-37fe5d41f6403b0ea84c1586548bf1b03f834af0.tar.xz linux-dev-37fe5d41f6403b0ea84c1586548bf1b03f834af0.zip | |
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/entry.S')
| -rw-r--r-- | arch/s390/kernel/entry.S | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 6286985a1039..24de1cd3754b 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -331,14 +331,26 @@ ENTRY(ret_from_fork) l %r12,__LC_THREAD_INFO l %r13,__LC_SVC_NEW_PSW+4 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? - jo 0f - st %r15,__PT_R15(%r11) # store stack pointer for new kthread -0: l %r1,BASED(.Lschedule_tail) + je 1f + l %r1,BASED(.Lschedule_tail) basr %r14,%r1 # call schedule_tail TRACE_IRQS_ON ssm __LC_SVC_NEW_PSW # reenable interrupts j sysc_tracenogo +1: # it's a kernel thread + st %r15,__PT_R15(%r11) # store stack pointer for new kthread + l %r1,BASED(.Lschedule_tail) + basr %r14,%r1 # call schedule_tail + TRACE_IRQS_ON + ssm __LC_SVC_NEW_PSW # reenable interrupts + lm %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 # at the usual place |