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Date: Tue, 1 Oct 2019 21:31:59 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Hans Verkuil <hverkuil@...all.nl>,
Jonathan Corbet <corbet@....net>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
John Stultz <john.stultz@...aro.org>,
Mathias Nyman <mathias.nyman@...el.com>
Subject: Re: [PATCH v2 1/4] lib/vsprintf: Print time64_t in human readable
format
On 01/10/2019 16:47:14+0300, Andy Shevchenko wrote:
> There are users which print time and date represented by content of
> time64_t type in human readable format.
>
> Instead of open coding that each time introduce %ptT[dt][r] specifier.
>
> Few test cases for %ptT specifier has been added as well.
>
> Cc: Hans Verkuil <hverkuil@...all.nl>
> Cc: Mathias Nyman <mathias.nyman@...el.com>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Cc: Jonathan Hunter <jonathanh@...dia.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> ---
> Documentation/core-api/printk-formats.rst | 22 ++++++++--------
> lib/test_printf.c | 13 +++++++---
> lib/vsprintf.c | 31 +++++++++++++++++++++--
> 3 files changed, 51 insertions(+), 15 deletions(-)
>
> diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
> index ecbebf4ca8e7..83f452e45f3f 100644
> --- a/Documentation/core-api/printk-formats.rst
> +++ b/Documentation/core-api/printk-formats.rst
> @@ -428,21 +428,23 @@ Examples::
>
> Passed by reference.
>
> -Time and date (struct rtc_time)
> --------------------------------
> +Time and date
> +-------------
>
> ::
>
> - %ptR YYYY-mm-ddTHH:MM:SS
> - %ptRd YYYY-mm-dd
> - %ptRt HH:MM:SS
> - %ptR[dt][r]
> + %pt[RT] YYYY-mm-ddTHH:MM:SS
> + %pt[RT]d YYYY-mm-dd
> + %pt[RT]t HH:MM:SS
> + %pt[RT][dt][r]
>
> -For printing date and time as represented by struct rtc_time structure in
> -human readable format.
> +For printing date and time as represented by
> + R struct rtc_time structure
> + T time64_t type
> +in human readable format.
>
> -By default year will be incremented by 1900 and month by 1. Use %ptRr (raw)
> -to suppress this behaviour.
> +By default year will be incremented by 1900 and month by 1.
> +Use %pt[RT]r (raw) to suppress this behaviour.
>
> Passed by reference.
>
> diff --git a/lib/test_printf.c b/lib/test_printf.c
> index 5d94cbff2120..16fb668685dd 100644
> --- a/lib/test_printf.c
> +++ b/lib/test_printf.c
> @@ -476,7 +476,7 @@ struct_va_format(void)
> }
>
> static void __init
> -struct_rtc_time(void)
> +time_and_date(void)
> {
> /* 1543210543 */
> const struct rtc_time tm = {
> @@ -487,14 +487,21 @@ struct_rtc_time(void)
> .tm_mon = 10,
> .tm_year = 118,
> };
> + /* 2019-01-04T15:32:23 */
> + time64_t t = 1546615943;
>
> - test("(%ptR?)", "%pt", &tm);
> + test("(%pt?)", "%pt", &tm);
> test("2018-11-26T05:35:43", "%ptR", &tm);
> test("0118-10-26T05:35:43", "%ptRr", &tm);
> test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
> test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
> test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
> test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
> +
> + test("2019-01-04T15:32:23", "%ptT", &t);
> + test("0119-00-04T15:32:23", "%ptTr", &t);
> + test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
> + test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);
> }
>
> static void __init
> @@ -610,7 +617,7 @@ test_pointer(void)
> uuid();
> dentry();
> struct_va_format();
> - struct_rtc_time();
> + time_and_date();
> struct_clk();
> bitmap();
> netdev_features();
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index e78017a3e1bd..e4bc380deb62 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -33,6 +33,7 @@
> #include <linux/dcache.h>
> #include <linux/cred.h>
> #include <linux/rtc.h>
> +#include <linux/time.h>
> #include <linux/uuid.h>
> #include <linux/of.h>
> #include <net/addrconf.h>
> @@ -1780,6 +1781,29 @@ char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
> return buf;
> }
>
> +static noinline_for_stack
> +char *time64_str(char *buf, char *end, const time64_t time,
> + struct printf_spec spec, const char *fmt)
> +{
> + struct rtc_time rtc_time;
> + struct tm tm;
> +
> + time64_to_tm(time, 0, &tm);
> +
> + rtc_time.tm_sec = tm.tm_sec;
> + rtc_time.tm_min = tm.tm_min;
> + rtc_time.tm_hour = tm.tm_hour;
> + rtc_time.tm_mday = tm.tm_mday;
> + rtc_time.tm_mon = tm.tm_mon;
> + rtc_time.tm_year = tm.tm_year;
> + rtc_time.tm_wday = tm.tm_wday;
> + rtc_time.tm_yday = tm.tm_yday;
> +
> + rtc_time.tm_isdst = 0;
> +
> + return rtc_str(buf, end, &rtc_time, spec, fmt);
> +}
> +
> static noinline_for_stack
> char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
> const char *fmt)
> @@ -1787,8 +1811,10 @@ char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
> switch (fmt[1]) {
> case 'R':
> return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt);
> + case 'T':
> + return time64_str(buf, end, *(const time64_t *)ptr, spec, fmt);
> default:
> - return error_string(buf, end, "(%ptR?)", spec);
> + return error_string(buf, end, "(%pt?)", spec);
> }
> }
>
> @@ -2088,8 +2114,9 @@ static char *kobject_string(char *buf, char *end, void *ptr,
> * - 'd[234]' For a dentry name (optionally 2-4 last components)
> * - 'D[234]' Same as 'd' but for a struct file
> * - 'g' For block_device name (gendisk + partition number)
> - * - 't[R][dt][r]' For time and date as represented:
> + * - 't[RT][dt][r]' For time and date as represented by:
> * R struct rtc_time
> + * T time64_t
> * - 'C' For a clock, it prints the name (Common Clock Framework) or address
> * (legacy clock framework) of the clock
> * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
> --
> 2.23.0
>
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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