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s390/time: Add read_persistent_wall_and_boot_offset() 

read_persistent_wall_and_boot_offset() will replace read_boot_clock64()
because on some architectures it is more convenient to read both sources
as one may depend on the other. For s390, implementation is the same
as read_boot_clock64() but also calling and returning value of
read_persistent_clock64()

Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: steven.sistare@oracle.com
Cc: daniel.m.jordan@oracle.com
Cc: linux@armlinux.org.uk
Cc: heiko.carstens@de.ibm.com
Cc: john.stultz@linaro.org
Cc: sboyd@codeaurora.org
Cc: hpa@zytor.com
Cc: douly.fnst@cn.fujitsu.com
Cc: peterz@infradead.org
Cc: prarit@redhat.com
Cc: feng.tang@intel.com
Cc: pmladek@suse.com
Cc: gnomes@lxorguk.ukuu.org.uk
Cc: linux-s390@vger.kernel.org
Cc: boris.ostrovsky@oracle.com
Cc: jgross@suse.com
Cc: pbonzini@redhat.com
Link: https://lkml.kernel.org/r/20180719205545.16512-15-pasha.tatashin@oracle.com
This commit is contained in:
Pavel Tatashin 2018-07-19 16:55:33 -04:00 committed by Thomas Gleixner
parent 38669ba205
commit be2e0e4257
1 changed files with 18 additions and 0 deletions
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18
arch/s390/kernel/time.c
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@ -221,6 +221,24 @@ void read_persistent_clock64(struct timespec64 *ts)
ext_to_timespec64(clk, ts);
}
void __init read_persistent_wall_and_boot_offset(struct timespec64 *wall_time,
struct timespec64 *boot_offset)
{
unsigned char clk[STORE_CLOCK_EXT_SIZE];
struct timespec64 boot_time;
__u64 delta;
delta = initial_leap_seconds + TOD_UNIX_EPOCH;
memcpy(clk, tod_clock_base, STORE_CLOCK_EXT_SIZE);
*(__u64 *)&clk[1] -= delta;
if (*(__u64 *)&clk[1] > delta)
clk[0]--;
ext_to_timespec64(clk, &boot_time);
read_persistent_clock64(wall_time);
*boot_offset = timespec64_sub(*wall_time, boot_time);
}
void read_boot_clock64(struct timespec64 *ts)
{
unsigned char clk[STORE_CLOCK_EXT_SIZE];