diff options
| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2016-12-28 00:36:02 +0900 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2017-01-14 16:46:30 -0500 |
| commit | 21cdd133ca8b328fe790c85b1dc104fdc4992a71 (patch) | |
| tree | af78391e095e5440dbd3231a00abcbe981ec2874 /include/dm | |
| parent | ff90af6c73883121358251bba66245ff4da3755c (diff) | |
| download | u-boot-imx-21cdd133ca8b328fe790c85b1dc104fdc4992a71.zip u-boot-imx-21cdd133ca8b328fe790c85b1dc104fdc4992a71.tar.gz u-boot-imx-21cdd133ca8b328fe790c85b1dc104fdc4992a71.tar.bz2 | |
time: import time_after, time_before and friends from Linux
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@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/dm')
0 files changed, 0 insertions, 0 deletions