Commit a69db2f6 authored Aug 13, 2015 by Heiko Carstens Committed by Martin Schwidefsky Aug 19, 2015

s390/facilities: remove transactional-execution bits



Remove the two facility bits

50 - constrained transactional-execution facility
74 - transactional-execution facility

from the required facilities if the kernel is built with -march=zEC12.

E.g. z/VM 6.3 doesn't virtualize the TX facility yet. Therefore a kernel
built with -march=zEC12 and ipl'ed on a zEC12 machine as a z/VM 6.3 guest
will emit a message about the missing facilities and stop working.

The kernel however doesn't make use of the TX facility, therefore remove
the two TX related facility bits and fix this unpleasant behavior.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent c0e5ddab

arch/s390/kernel/head.S

+2 −2

Original line number	Diff line number	Diff line
		@@ -414,9 +414,9 @@ ENTRY(startup_kdump)
		# followed by the facility words.

		#if defined(CONFIG_MARCH_Z13)
		.long 3, 0xc100eff2, 0xf46ce800, 0x00400000
		.long 2, 0xc100eff2, 0xf46cc800
		#elif defined(CONFIG_MARCH_ZEC12)
		.long 3, 0xc100eff2, 0xf46ce800, 0x00400000
		.long 2, 0xc100eff2, 0xf46cc800
		#elif defined(CONFIG_MARCH_Z196)
		.long 2, 0xc100eff2, 0xf46c0000
		#elif defined(CONFIG_MARCH_Z10)

Admin message