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Revert "s390/kdump: Clear subchannel ID to signal non-CCW/SCSI IPL"

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This reverts commit 852ffd0f4e.

There are use cases where an intermediate boot kernel (1) uses kexec
to boot the final production kernel (2). For this scenario we should
provide the original boot information to the production kernel (2).
Therefore clearing the boot information during kexec() should not
be done.

Cc: stable@vger.kernel.org # v3.17+
Reported-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2016-06-13 17:03:48 +02:00 committed by Martin Schwidefsky
parent 02184c60eb
commit 5419447e21
1 changed files with 0 additions and 7 deletions
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arch/s390/kernel/ipl.c
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@ -2064,12 +2064,5 @@ void s390_reset_system(void)
S390_lowcore.program_new_psw.addr =
(unsigned long) s390_base_pgm_handler;
/*
* Clear subchannel ID and number to signal new kernel that no CCW or
* SCSI IPL has been done (for kexec and kdump)
*/
S390_lowcore.subchannel_id = 0;
S390_lowcore.subchannel_nr = 0;
do_reset_calls();
}