Heiko Carstens 3975673309 nmi: fix clock comparator revalidation ... commit e8129c6421 upstream. On each machine check all registers are revalidated. The save area for the clock comparator however only contains the upper most seven bytes of the former contents, if valid. Therefore the machine check handler uses a store clock instruction to get the current time and writes that to the clock comparator register which in turn will generate an immediate timer interrupt. However within the lowcore the expected time of the next timer interrupt is stored. If the interrupt happens before that time the handler won't be called. In turn the clock comparator won't be reprogrammed and therefore the interrupt condition stays pending which causes an interrupt loop until the expected time is reached. On NOHZ machines this can result in unresponsive machines since the time of the next expected interrupted can be a couple of days in the future. To fix this just revalidate the clock comparator register with the expected value. In addition the special handling for udelay must be changed as well. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2010-12-09 13:33:35 -08:00
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delay.c	nmi: fix clock comparator revalidation	2010-12-09 13:33:35 -08:00
div64.c	[S390] __div64_31 broken for CONFIG_MARCH_G5	2009-03-18 13:28:12 +01:00
Makefile	[S390] uaccess: make sure copy_from_user_overflow is builtin	2010-03-08 12:25:29 +01:00
qrnnd.S	[S390] Calibrate delay and bogomips.	2007-02-05 21:18:31 +01:00
spinlock.c	[S390] spinlock: check virtual cpu running status	2010-02-26 22:37:31 +01:00
string.c	[S390] use compiler builtin versions of strlen/strcpy/strcat	2009-03-26 15:24:24 +01:00
uaccess_mvcos.c	[S390] Improve address space mode selection.	2009-12-07 12:51:33 +01:00
uaccess_pt.c	[S390] Use do_exception() in pagetable walk usercopy functions.	2009-12-07 12:51:34 +01:00
uaccess_std.c	[S390] Add EX_TABLE for addressing exception in usercopy functions.	2009-10-06 10:35:10 +02:00
uaccess.h	[S390] Get rid of a lot of sparse warnings.	2007-02-05 21:16:47 +01:00
ucmpdi2.c	[S390] add __ucmpdi2() helper function	2009-07-07 16:37:53 +02:00
usercopy.c	[S390] uaccess: implement strict user copy checks	2010-02-26 22:37:29 +01:00