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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-10-11 15:30:14 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-10-29 10:54:37 -0400 |
| commit | 30dcb0996e409ee7353a8fc2fab90ad6503b0788 (patch) | |
| tree | e06bc081e3c65c88ee2bdbdd2c5645e6ca834073 /arch/s390/kernel/entry.S | |
| parent | ddffeb8c4d0331609ef2581d84de4d763607bd37 (diff) | |
| download | blackbird-op-linux-30dcb0996e409ee7353a8fc2fab90ad6503b0788.tar.gz blackbird-op-linux-30dcb0996e409ee7353a8fc2fab90ad6503b0788.zip | |
s390: switch to saner kernel_execve() semantics
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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 | 32 |
1 files changed, 5 insertions, 27 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index ef46f66bc0d6..aa8f2ba6289b 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -330,40 +330,18 @@ ENTRY(ret_from_fork) la %r11,STACK_FRAME_OVERHEAD(%r15) l %r12,__LC_THREAD_INFO l %r13,__LC_SVC_NEW_PSW+4 - tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? - 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 + tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? + jne sysc_tracenogo + # it's a kernel thread + lm %r9,%r10,__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 -# -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 + j sysc_tracenogo /* * Program check handler routine |
