Jisheng Zhang
272a25a247
clocksource/drivers/pistachio: Fix wrong calculated clocksource read value ...
Let's assume the counter value is 0xf0000000, the pistachio clocksource
read cycles function should return ~0x0fffffff but actually it returns
0xffffffff0fffffff.
That occurs because:
~(cycle_t)value is different from (cycle_t)~value.
unsigned long val = ~(unsigned long)0xf0000000;
40049a: 48 b8 ff ff ff 0f ff movabs $0xffffffff0fffffff,%rax
unsigned long val = (unsigned long)~0xf0000000;
40049a: 48 c7 45 f8 ff ff ff movq $0xfffffff,-0x8(%rbp)
We fix this issue by calculating bitwise-not counter, then cast to
cycle_t.
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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