kernel/arch/s390/include/asm/timex.h, branch linux-5.14.y

s390/timex: get rid of register asm

2021-06-28T09:18:28Z

Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/time,idle: get rid of unsigned long long

2021-03-08T09:46:27Z

Get rid of unsigned long long, and use unsigned long instead everywhere. The usage of unsigned long long is a leftover from 31 bit kernel support. Signed-off-by: Heiko Carstens

s390/time: remove get_tod_clock_ext()

2021-02-13T16:17:55Z

Remove get_tod_clock_ext() and the STORE_CLOCK_EXT_SIZE define. This enforces all users of the existing low level functions to use a union tod_clock. This way there is now a compile time check for the correct time and therefore also if the size of the argument matches what will be written to by the STORE CLOCK EXTENDED instruction. Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/time: convert tod_clock_base to union

2021-02-13T16:17:54Z

Convert tod_clock_base to union tod_clock. This simplifies quite a bit of code and also fixes a bug in read_persistent_clock64(); void read_persistent_clock64(struct timespec64 *ts) { __u64 delta; delta = initial_leap_seconds + TOD_UNIX_EPOCH; get_tod_clock_ext(clk); *(__u64 *) &clk[1] -= delta; if (*(__u64 *) &clk[1] > delta) clk[0]--; ext_to_timespec64(clk, ts); } Assume &clk[1] == 3 and delta == 2; then after the substraction the if condition becomes true and the epoch part of the clock is decremented by one because of an assumed overflow, even though there is none. Fix this by using 128 bit arithmetics and let the compiler do the right thing: void read_persistent_clock64(struct timespec64 *ts) { union tod_clock clk; u64 delta; delta = initial_leap_seconds + TOD_UNIX_EPOCH; store_tod_clock_ext(&clk); clk.eitod -= delta; ext_to_timespec64(&clk, ts); } Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/time: introduce new store_tod_clock_ext()

2021-02-13T16:17:54Z

Introduce new store_tod_clock_ext() function, which is the same like store_tod_clock_ext_cc() except that it doesn't return a condition code. Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/time: rename store_tod_clock_ext() and use union tod_clock

2021-02-13T16:17:54Z

Rename store_tod_clock_ext() to store_tod_clock_ext_cc() to reflect that it returns a condition code and also use union tod_clock as parameter. Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/time: introduce union tod_clock

2021-02-13T16:17:54Z

Introduce union tod_clock which is supposed to be used to decode and access various fields of the result of STORE CLOCK EXTENDED. Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/time: use stcke instead of stck

2021-02-09T14:57:05Z

Use STORE CLOCK EXTENDED instead of STORE CLOCK in early tod clock setup. This is just to remove another usage of stck, trying to remove all usages of STORE CLOCK. This doesn't fix anything. Reviewed-by: Christian Borntraeger Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/vdso: reimplement getcpu vdso syscall

2020-11-23T11:01:13Z

Implement the previously removed getcpu vdso syscall by using the TOD programmable field to pass the cpu number to user space. Reviewed-by: Sven Schnelle Signed-off-by: Heiko Carstens

s390/time: remove unused function

2020-06-29T14:32:14Z

Signed-off-by: Sven Schnelle Acked-by: Heiko Carstens Signed-off-by: Heiko Carstens