Chris Packham 73a4152b25 mips: Use unsigned int when reading c0 registers ... In commit a18a477 (MIPS: use common code from lib/time.c) MIPS platforms started using common the common timer functions which are based around the fact that many platforms have a 32-bit free running counter register that can be used see commit 8dfafdd (Introduce common timer functions). Even MIPS64 has such a 32-bit register (some have an additional 64-bit free running counter, but that's something for another time). The problem is that in __read_32bit_c0_register() we read the value from this register into an _signed_ int and as it's returned up the call chain to timer_read_counter() it gets assigned to an unsigned long. On a 32-bit system there is no problem. On a 64-bit system odd things happen, sign extension seems to kick in and all of a sudden if the counter register happens to have the MSb (i.e. the sign bit) set the negative int gets sign extended into a very large unsigned long value. This in turn throws out things from get_ticks() up. Update __read_32bit_c0_register() and __read_32bit_c0_ctrl_register() to use "unsigned int res;" instead of "int res;". There seems to be little reason to treat these register values as signed. They are either counters (which by definition are unsigned) or are made up of various bit fields to be interpreted as per the CPU datasheet. Reported-by: Sachin Surendran <sachin.surendran@alliedtelesis.co.nz> Signed-off-by: Chris Packham <judge.packham@gmail.com>		2015-08-21 15:22:41 +02:00
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cpu	MIPS: unify CPU code in arch/mips/cpu/	2015-01-30 14:19:58 +01:00
include/asm	mips: Use unsigned int when reading c0 registers	2015-08-21 15:22:41 +02:00
lib	MIPS: implement device-tree handover to Linux kernel	2015-04-24 12:15:34 +02:00
mach-au1x00	net: cosmetic: Fix var naming net <-> eth drivers	2015-04-18 11:11:33 -06:00
config.mk	generic-board: move __HAVE_ARCH_GENERIC_BOARD to Kconfig	2015-03-28 09:03:08 -04:00
Kconfig	Move default y configs out of arch/board Kconfig	2015-06-25 22:17:55 -04:00
Makefile	MIPS: unify CPU code in arch/mips/cpu/	2015-01-30 14:19:58 +01:00