From 11dd2a979a5b81d69d6c877f94541987b19c54b5 Mon Sep 17 00:00:00 2001 From: Tina Ruchandani Date: Thu, 30 Oct 2014 17:45:22 -0700 Subject: [PATCH] Staging: lustre: lnet: Improve 'incarnation' stamp ksock_net_t uses a __u64 quantity as an 'incarnation' timestamp. This is also passed on in hello messages and used to detect if a reboot has occurred. This 'incarnation' is obtained using do_gettimeofday.It is only used in equality checks, so the absolute value does not matter. This patch replaces do_gettimeofday with ktime_get_ns for the following reasons: 1. ktime_get_ns returns a __u64 which is safer than 'struct timeval' which will overflow on 32-bit systems in year 2038 and beyond. 2. Reduced compute: ktime_get_ns is faster than the multiply/add combination used in this function Signed-off-by: Tina Ruchandani Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c index 038854e..8ac6410 100644 --- a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c +++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c @@ -2348,16 +2348,11 @@ ksocknal_base_shutdown(void) static __u64 ksocknal_new_incarnation (void) { - struct timeval tv; /* The incarnation number is the time this module loaded and it - * identifies this particular instance of the socknal. Hopefully - * we won't be able to reboot more frequently than 1MHz for the - * foreseeable future :) */ - - do_gettimeofday(&tv); - - return (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec; + * identifies this particular instance of the socknal. + */ + return ktime_get_ns(); } static int -- 2.7.4