The patch titled
Subject: init: use ktime_us_delta() to make initcall_debug log more precise
has been added to the -mm tree. Its filename is
init-use-ktime_us_delta-to-make-initcall_debug-log-more-precise.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/init-use-ktime_us_delta-to-make-initcall_debug-log-more-precise.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/init-use-ktime_us_delta-to-make-initcall_debug-log-more-precise.patch
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------------------------------------------------------
From: Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx>
Subject: init: use ktime_us_delta() to make initcall_debug log more precise
Use ktime_us_delta() to make the initcall_debug log more precise than
right shifting the result of ktime_to_ns() by 10 bits.
Link: https://lkml.kernel.org/r/20220209053350.15771-1-mark-pk.tsai@xxxxxxxxxxxx
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx>
Reviewed-by: Andrew Halaney <ahalaney@xxxxxxxxxx>
Tested-by: Andrew Halaney <ahalaney@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Valentin Schneider <valentin.schneider@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: YJ Chiang <yj.chiang@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/init/main.c~init-use-ktime_us_delta-to-make-initcall_debug-log-more-precise
+++ a/init/main.c
@@ -1246,15 +1246,11 @@ trace_initcall_start_cb(void *data, init
static __init_or_module void
trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
{
- ktime_t *calltime = (ktime_t *)data;
- ktime_t delta, rettime;
- unsigned long long duration;
+ ktime_t rettime, *calltime = (ktime_t *)data;
rettime = ktime_get();
- delta = ktime_sub(rettime, *calltime);
- duration = (unsigned long long) ktime_to_ns(delta) >> 10;
printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
- fn, ret, duration);
+ fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime));
}
static ktime_t initcall_calltime;
_
Patches currently in -mm which might be from mark-pk.tsai@xxxxxxxxxxxx are
init-use-ktime_us_delta-to-make-initcall_debug-log-more-precise.patch
