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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2012-05-21 11:30:30 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-05-23 17:06:51 +0200
commitfa7c0043425624ed65b94a6fabe750c7b0af8719 (patch)
tree8e21c28d65b56a0bd22af1b9a196083233341b3c /arch/s390/oprofile
parenta9fbf1a53836d4105f95df947ac00e22311dff33 (diff)
downloadlinux-linaro-stable-fa7c0043425624ed65b94a6fabe750c7b0af8719.tar.gz
s390/kdump: Use real mode for PSW restart and kexec
Currently the PSW restart handler and kexec are executed in real mode with DAT=off. For kexec/kdump the function setup_regs() is called that uses the per-cpu variable "crash_notes". Because there are situations when the per-cpu implementation uses vmalloc memory, calling setup_regs() in real mode can cause a program check interrupt. To fix that problem this patch changes the following: * Ensure that diag308_reset() does not change PSW bits to real mode * Enable DAT in __do_restart() after we switched to an online CPU * Enable DAT in __machine_kexec() after we switched to the IPL CPU * Call setup_regs() before we switch to real mode and call purgatory Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/oprofile')
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