[U-Boot] [U-Boot, v2, 4/5] time: import time_after, time_before and friends from Linux

[Tom Rini]

On Wed, Dec 28, 2016 at 12:36:02AM +0900, Masahiro Yamada wrote:

> It is not safe to compare timer values directly.
> 
> On 32-bit systems, for example, timer_get_us() wraps around every
> 72 min. (2 ^ 32 / 1000000 =~ 4295 sec =~ 72 min).  Depending on
> the get_ticks() implementation, it may wrap more frequently.
> The 72 min might be possible on the use of U-Boot.
> 
> Let's borrow time_after, time_before, and friends to solve the
> wrap-around problem.
> 
> These macros were copied from include/linux/jiffies.h of Linux 4.9.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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