linux-toradex.git/arch/s390/kernel/entry.S, branch v2.6.25.17

[S390] Fix couple of section mismatches.

2008-02-05T15:50:56+00:00

Fix couple of section mismatches. And since we touch the code
anyway change the IPL code to use C99 initializers.

Cc: Michael Holzheu 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] Fix compile error on 31bit without preemption

2007-12-04T15:09:58+00:00

Commit b8e7a54cd06b0b0174029ef3a7f5a1415a2c28f2 introduced a compile
error if CONFIG_PREEMPT is not set:

arch/s390/kernel/built-in.o: In function `cleanup_io_leave_insn':
/space/kvm/arch/s390/kernel/entry.S:(.text+0xbfce): undefined reference to `preempt_schedule_irq'

This patch hides preempt_schedule_irq if CONFIG_PREEMPT is not set.

Signed-off-by: Christian Borntraeger 
Signed-off-by: Martin Schwidefsky

[S390] Fix kernel preemption.

2007-11-20T10:13:46+00:00

When returning from IRQ handling and TIF_NEED_RESCHED is set we must
call preempt_schedule_irq() instead of schedule().
Otherwise the BKL might be unlocked in schedule() and therfore
everything that relies on the BKL is broken.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] Fix irq tracing and lockdep_sys_exit calls.

2007-11-20T10:13:45+00:00

Current support for TRACE_IRQFLAGS and lockdep_sys_exit is broken.
IRQ flag tracing is broken for program checks. Even worse is that
the newly introduced calls to lockdep_sys_exit are in the critical
section code which is not supposed to call any C functions. In
addition the checks if locks are still held are also done when
returning to kernel code which is broken as well.
Fix all this by disabling interrupts and machine checks at the
exit paths and then do the appropriate checks and calls.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

lockdep: s390: connect the sysexit hook

2007-10-11T20:11:12+00:00

Run the lockdep_sys_exit hook before returning to user space.

Reviewed-by: Martin Schwidefsky 
Signed-off-by: Heiko Carstens 
Signed-off-by: Peter Zijlstra 
Signed-off-by: Ingo Molnar

[S390] Fix IRQ tracing.

2007-07-27T10:29:19+00:00

If a machine check is pending and the external or I/O interrupt handler
returns to userspace io_mcck_pending is going to call s390_handle_mcck.
Before this happens a call to TRACE_IRQS_ON was already made since we
know that we are going back to userspace and hence interrupts will be
enabled. So there was an indication that interrupts are enabled while
in reality they are still disabled.
s390_handle_mcck will do a local_irq_save/restore pair and confuse
lockdep which later complains about inconsistent irq tracing.
To solve this just call trace_hardirqs_off before calling
s390_handle_mcck and trace_hardirqs_on afterwards.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] system call optimization.

2007-07-10T09:24:51+00:00

After the in-kernel system call has been remove the system call path
can be optimized. The problem state bit of the old psw is always set
between system_call and sysc_do_svc. SAVE_ALL_SVC uses this information
to avoid two instructions.

Signed-off-by: Martin Schwidefsky

[S390] Fix yet another two section mismatches.

2007-06-19T11:10:19+00:00

WARNING: arch/s390/kernel/built-in.o(.text+0xb92a):
	 Section mismatch: reference to .init.text:start_secondary
	 (between 'restart_addr' and 'stack_overflow')
WARNING: arch/s390/appldata/built-in.o(.data+0xdc):
	 Section mismatch: reference to .init.text:
	 (between 'appldata_nb' and 'appldata_timer_lock')

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] System call cleanup.

2007-04-27T14:01:42+00:00

Remove system call glue for sys_clone, sys_fork, sys_vfork, sys_execve,
sys_sigreturn, sys_rt_sigreturn and sys_sigaltstack. Call do_execve from
kernel_execve directly, move pt_regs to the right place and branch to
sysc_return to start the user space program. This removes the last
in-kernel system call.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Heiko Carstens

[S390] Whitespace cleanup.

2006-09-28T14:56:37+00:00

Huge s390 assembly files whitespace cleanup.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky