On Wed, Sep 16, 2015 at 06:21:04PM +0800, Josh Wu wrote:
As 'time(0) | getpid()' will have a lot of duplicated value. It is not a expected behavior. We expect different value for the seed when when run it in many times.
So this patch will left shift the getpid() and add to time(0). That avoid duplicated value.
Test command is like: % RUN=0; while [ $RUN -lt 10000 ]; do tools/gen_eth_addr; RUN=$(($RUN+1)); done | sort | uniq | wc -l 10000
This patch is incorporated with suggestions made by Wolfgang Denk and Andreas Bießmann. Thanks them a lot.
Signed-off-by: Josh Wu josh.wu@atmel.com Acked-by: Andreas Bießmann andreas.devel@googlemail.com Acked-by: Wolfgang Denk wd@denx.de Tested-by: Wolfgang Denk wd@denx.de
Applied to u-boot/master, thanks!