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s390/time: remove get_tod_clock_ext() 

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 <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-02-08 16:19:27 +01:00 committed by Vasily Gorbik
parent fc4a925f77
commit 7ef37dd7bb
1 changed files with 3 additions and 12 deletions
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15
arch/s390/include/asm/timex.h
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@ -17,8 +17,6 @@
/* The value of the TOD clock for 1.1.1970. */
#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
#define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */
extern u64 clock_comparator_max;
union tod_clock {
@ -173,19 +171,12 @@ static inline void local_tick_enable(unsigned long long comp)
typedef unsigned long long cycles_t;
static inline void get_tod_clock_ext(char *clk)
{
typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype;
asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc");
}
static inline unsigned long long get_tod_clock(void)
{
char clk[STORE_CLOCK_EXT_SIZE];
union tod_clock clk;
get_tod_clock_ext(clk);
return *((unsigned long long *)&clk[1]);
store_tod_clock_ext(&clk);
return clk.tod;
}
static inline unsigned long long get_tod_clock_fast(void)