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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-10-11 21:30:14 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-10-29 15:54:37 +0100 |
| commit | 30dcb0996e409ee7353a8fc2fab90ad6503b0788 (patch) | |
| tree | e06bc081e3c65c88ee2bdbdd2c5645e6ca834073 /arch/s390/kernel/entry64.S | |
| parent | Linux 3.7-rc1 (diff) | |
| download | linux-30dcb0996e409ee7353a8fc2fab90ad6503b0788.tar.xz 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/entry64.S')
| -rw-r--r-- | arch/s390/kernel/entry64.S | 26 |
1 files changed, 5 insertions, 21 deletions
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 07d8de353984..499e95e90f38 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -352,33 +352,17 @@ sysc_tracenogo: 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 ? - 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 + tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? + jne sysc_tracenogo + # it's a kernel thread + lmg %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 - -ENTRY(ret_from_kernel_execve) - ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts - lgr %r15,%r2 - lgr %r11,%r2 - aghi %r15,-STACK_FRAME_OVERHEAD - xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) - lg %r12,__LC_THREAD_INFO - ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_return + j sysc_tracenogo /* * Program check handler routine |