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Stop ia64 being the last holdout using GENERIC_TIME_VSYSCALL_OLD

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so John Stultz can drop that code.
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Merge tag 'please-pull-gettime_vsyscall_update' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux

Pull ia64 update from Tony Luck:
 "Stop ia64 being the last holdout using GENERIC_TIME_VSYSCALL_OLD so
  that John Stultz can drop that code"

* tag 'please-pull-gettime_vsyscall_update' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  ia64: Update fsyscall gettime to use modern vsyscall_update
This commit is contained in:
Linus Torvalds 2017-11-13 12:15:40 -08:00
commit f08d8bcc12
5 changed files with 35 additions and 25 deletions
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2
arch/ia64/Kconfig
View File

@ -47,7 +47,7 @@ config IA64
select ARCH_TASK_STRUCT_ALLOCATOR
select ARCH_THREAD_STACK_ALLOCATOR
select ARCH_CLOCKSOURCE_DATA
select GENERIC_TIME_VSYSCALL_OLD
select GENERIC_TIME_VSYSCALL
select SYSCTL_ARCH_UNALIGN_NO_WARN
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA

2
arch/ia64/kernel/asm-offsets.c
View File

@ -212,6 +212,8 @@ void foo(void)
BLANK();
DEFINE(IA64_TIMESPEC_TV_NSEC_OFFSET,
offsetof (struct timespec, tv_nsec));
DEFINE(IA64_TIME_SN_SPEC_SNSEC_OFFSET,
offsetof (struct time_sn_spec, snsec));
DEFINE(CLONE_SETTLS_BIT, 19);
#if CLONE_SETTLS != (1<<19)

8
arch/ia64/kernel/fsys.S
View File

@ -236,9 +236,9 @@ ENTRY(fsys_gettimeofday)
MOV_FROM_ITC(p8, p6, r2, r10) // CPU_TIMER. 36 clocks latency!!!
(p9) ld8 r2 = [r30] // MMIO_TIMER. Could also have latency issues..
(p13) ld8 r25 = [r19] // get itc_lastcycle value
ld8 r9 = [r22],IA64_TIMESPEC_TV_NSEC_OFFSET // tv_sec
ld8 r9 = [r22],IA64_TIME_SN_SPEC_SNSEC_OFFSET // sec
;;
ld8 r8 = [r22],-IA64_TIMESPEC_TV_NSEC_OFFSET // tv_nsec
ld8 r8 = [r22],-IA64_TIME_SN_SPEC_SNSEC_OFFSET // snsec
(p13) sub r3 = r25,r2 // Diff needed before comparison (thanks davidm)
;;
(p13) cmp.gt.unc p6,p7 = r3,r0 // check if it is less than last. p6,p7 cleared
@ -266,9 +266,9 @@ EX(.fail_efault, probe.w.fault r31, 3)
mf
;;
ld4 r10 = [r20] // gtod_lock.sequence
shr.u r2 = r2,r23 // shift by factor
;;
add r8 = r8,r2 // Add xtime.nsecs
;;
shr.u r8 = r8,r23 // shift by factor
cmp4.ne p7,p0 = r28,r10
(p7) br.cond.dpnt.few .time_redo // sequence number changed, redo
// End critical section.

10
arch/ia64/kernel/fsyscall_gtod_data.h
View File

@ -6,10 +6,16 @@
* fsyscall gettimeofday data
*/
/* like timespec, but includes "shifted nanoseconds" */
struct time_sn_spec {
u64 sec;
u64 snsec;
};
struct fsyscall_gtod_data_t {
seqcount_t seq;
struct timespec wall_time;
struct timespec monotonic_time;
struct time_sn_spec wall_time;
struct time_sn_spec monotonic_time;
u64 clk_mask;
u32 clk_mult;
u32 clk_shift;

38
arch/ia64/kernel/time.c
View File

@ -430,30 +430,32 @@ void update_vsyscall_tz(void)
{
}
void update_vsyscall_old(struct timespec *wall, struct timespec *wtm,
struct clocksource *c, u32 mult, u64 cycle_last)
void update_vsyscall(struct timekeeper *tk)
{
write_seqcount_begin(&fsyscall_gtod_data.seq);
/* copy fsyscall clock data */
fsyscall_gtod_data.clk_mask = c->mask;
fsyscall_gtod_data.clk_mult = mult;
fsyscall_gtod_data.clk_shift = c->shift;
fsyscall_gtod_data.clk_fsys_mmio = c->archdata.fsys_mmio;
fsyscall_gtod_data.clk_cycle_last = cycle_last;
/* copy vsyscall data */
fsyscall_gtod_data.clk_mask = tk->tkr_mono.mask;
fsyscall_gtod_data.clk_mult = tk->tkr_mono.mult;
fsyscall_gtod_data.clk_shift = tk->tkr_mono.shift;
fsyscall_gtod_data.clk_fsys_mmio = tk->tkr_mono.clock->archdata.fsys_mmio;
fsyscall_gtod_data.clk_cycle_last = tk->tkr_mono.cycle_last;
/* copy kernel time structures */
fsyscall_gtod_data.wall_time.tv_sec = wall->tv_sec;
fsyscall_gtod_data.wall_time.tv_nsec = wall->tv_nsec;
fsyscall_gtod_data.monotonic_time.tv_sec = wtm->tv_sec
+ wall->tv_sec;
fsyscall_gtod_data.monotonic_time.tv_nsec = wtm->tv_nsec
+ wall->tv_nsec;
fsyscall_gtod_data.wall_time.sec = tk->xtime_sec;
fsyscall_gtod_data.wall_time.snsec = tk->tkr_mono.xtime_nsec;
fsyscall_gtod_data.monotonic_time.sec = tk->xtime_sec
+ tk->wall_to_monotonic.tv_sec;
fsyscall_gtod_data.monotonic_time.snsec = tk->tkr_mono.xtime_nsec
+ ((u64)tk->wall_to_monotonic.tv_nsec
<< tk->tkr_mono.shift);
/* normalize */
while (fsyscall_gtod_data.monotonic_time.tv_nsec >= NSEC_PER_SEC) {
fsyscall_gtod_data.monotonic_time.tv_nsec -= NSEC_PER_SEC;
fsyscall_gtod_data.monotonic_time.tv_sec++;
while (fsyscall_gtod_data.monotonic_time.snsec >=
(((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) {
fsyscall_gtod_data.monotonic_time.snsec -=
((u64)NSEC_PER_SEC) << tk->tkr_mono.shift;
fsyscall_gtod_data.monotonic_time.sec++;
}
write_seqcount_end(&fsyscall_gtod_data.seq);