linux-kernel - [RFC v7 19/23] timer_list: print_tickdevice(): calculate ->min_delta

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 16 Sep 2016 22:12:00 +0200
From:   Nicolai Stange <nicstange@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     John Stultz <john.stultz@...aro.org>, linux-kernel@...r.kernel.org,
        Nicolai Stange <nicstange@...il.com>
Subject: [RFC v7 19/23] timer_list: print_tickdevice(): calculate ->min_delta_ns dynamically

print_tickdevice(), assembling the per-tick device sections in
/proc/timer_list, is the last user of struct clock_event_device's
->min_delta_ns member.

In order to make this one fully obsolete while retaining userspace ABI,
calculate the displayed value of 'min_delta_ns' on the fly from
->min_delta_ticks_adjusted.

Signed-off-by: Nicolai Stange <nicstange@...il.com>
---
 kernel/time/timer_list.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index ac20d4c..9067760 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -206,10 +206,11 @@ static void
 print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
 {
 	struct clock_event_device *dev = td->evtdev;
-	u64 max_delta_ns;
+	u64 max_delta_ns, min_delta_ns;
 
 	max_delta_ns = clockevent_delta2ns(dev->max_delta_ticks, dev);
 	max_delta_ns = min(max_delta_ns, dev->max_delta_ns);
+	min_delta_ns = clockevent_delta2ns(dev->min_delta_ticks_adjusted, dev);
 
 	SEQ_printf(m, "Tick Device: mode:     %d\n", td->mode);
 	if (cpu < 0)
@@ -226,7 +227,7 @@ print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
 	SEQ_printf(m, " max_delta_ns:   %llu\n",
 		   (unsigned long long) max_delta_ns);
 	SEQ_printf(m, " min_delta_ns:   %llu\n",
-		   (unsigned long long) dev->min_delta_ns);
+		   (unsigned long long) min_delta_ns);
 	SEQ_printf(m, " mult:           %u\n", dev->mult);
 	SEQ_printf(m, " shift:          %u\n", dev->shift);
 	SEQ_printf(m, " mode:           %d\n", clockevent_get_state(dev));
-- 
2.10.0