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[S390] Fix irq tracing and lockdep_sys_exit calls.

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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 <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2007-11-20 11:13:32 +01:00
committed by Martin Schwidefsky
parent 7aa8dac7ac
commit 411788ea7f
4 changed files with 158 additions and 66 deletions
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4
arch/s390/kernel/setup.c
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@@ -492,6 +492,10 @@ static void setup_addressing_mode(void)
printk("S390 address spaces switched, ");
set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
}
#ifdef CONFIG_TRACE_IRQFLAGS
sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
#endif
}
static void __init