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![Linus Torvalds](/assets/img/avatar_default.png)
Core: - Consolidation of the vDSO build infrastructure to address the difficulties of cross-builds for ARM64 compat vDSO libraries by restricting the exposure of header content to the vDSO build. This is achieved by splitting out header content into separate headers. which contain only the minimaly required information which is necessary to build the vDSO. These new headers are included from the kernel headers and the vDSO specific files. - Enhancements to the generic vDSO library allowing more fine grained control over the compiled in code, further reducing architecture specific storage and preparing for adopting the generic library by PPC. - Cleanup and consolidation of the exit related code in posix CPU timers. - Small cleanups and enhancements here and there Drivers: - The obligatory new drivers: Ingenic JZ47xx and X1000 TCU support - Correct the clock rate of PIT64b global clock - setup_irq() cleanup - Preparation for PWM and suspend support for the TI DM timer - Expand the fttmr010 driver to support ast2600 systems - The usual small fixes, enhancements and cleanups all over the place -----BEGIN PGP SIGNATURE----- iQJHBAABCgAxFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAl6B+QETHHRnbHhAbGlu dXRyb25peC5kZQAKCRCmGPVMDXSYofJ5D/94s5fpaqiuNcaAsLq2D3DRIrTnqxx7 yEeAOPcbYV1bM1SgY/M83L5yGc2S8ny787e26abwRTCZhZV3eAmRTphIFFIZR0Xk xS+i67odscbdJTRtztKj3uQ9rFxefszRuphyaa89pwSY9nnyMWLcahGSQOGs0LJK hvmgwPjyM1drNfPxgPiaFg7vDr2XxNATpQr/FBt+BhelvVan8TlAfrkcNPiLr++Y Axz925FP7jMaRRbZ1acji34gLiIAZk0jLCUdbix7YkPrqDB4GfO+v8Vez+fGClbJ uDOYeR4r1+Be/BtSJtJ2tHqtsKCcAL6agtaE2+epZq5HbzaZFRvBFaxgFNF8WVcn 3FFibdEMdsRNfZTUVp5wwgOLN0UIqE/7LifE12oLEL2oFB5H2PiNEUw3E02XHO11 rL3zgHhB6Ke1sXKPCjSGdmIQLbxZmV5kOlQFy7XuSeo5fmRapVzKNffnKcftIliF 1HNtZbgdA+3tdxMFCqoo1QX+kotl9kgpslmdZ0qHAbaRb3xqLoSskbqEjFRMuSCC 8bjJrwboD9T5GPfwodSCgqs/58CaSDuqPFbIjCay+p90Fcg6wWAkZtyG04ZLdPRc GgNNdN4gjTD9bnrRi8cH47z1g8OO4vt4K4SEbmjo8IlDW+9jYMxuwgR88CMeDXd7 hu7aKsr2I2q/WQ== =5o9G -----END PGP SIGNATURE----- Merge tag 'timers-core-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull timekeeping and timer updates from Thomas Gleixner: "Core: - Consolidation of the vDSO build infrastructure to address the difficulties of cross-builds for ARM64 compat vDSO libraries by restricting the exposure of header content to the vDSO build. This is achieved by splitting out header content into separate headers. which contain only the minimaly required information which is necessary to build the vDSO. These new headers are included from the kernel headers and the vDSO specific files. - Enhancements to the generic vDSO library allowing more fine grained control over the compiled in code, further reducing architecture specific storage and preparing for adopting the generic library by PPC. - Cleanup and consolidation of the exit related code in posix CPU timers. - Small cleanups and enhancements here and there Drivers: - The obligatory new drivers: Ingenic JZ47xx and X1000 TCU support - Correct the clock rate of PIT64b global clock - setup_irq() cleanup - Preparation for PWM and suspend support for the TI DM timer - Expand the fttmr010 driver to support ast2600 systems - The usual small fixes, enhancements and cleanups all over the place" * tag 'timers-core-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (80 commits) Revert "clocksource/drivers/timer-probe: Avoid creating dead devices" vdso: Fix clocksource.h macro detection um: Fix header inclusion arm64: vdso32: Enable Clang Compilation lib/vdso: Enable common headers arm: vdso: Enable arm to use common headers x86/vdso: Enable x86 to use common headers mips: vdso: Enable mips to use common headers arm64: vdso32: Include common headers in the vdso library arm64: vdso: Include common headers in the vdso library arm64: Introduce asm/vdso/processor.h arm64: vdso32: Code clean up linux/elfnote.h: Replace elf.h with UAPI equivalent scripts: Fix the inclusion order in modpost common: Introduce processor.h linux/ktime.h: Extract common header for vDSO linux/jiffies.h: Extract common header for vDSO linux/time64.h: Extract common header for vDSO linux/time32.h: Extract common header for vDSO linux/time.h: Extract common header for vDSO ...
234 lines
5.4 KiB
C
234 lines
5.4 KiB
C
/*
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* include/linux/ktime.h
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*
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* ktime_t - nanosecond-resolution time format.
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*
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* Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
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* Copyright(C) 2005, Red Hat, Inc., Ingo Molnar
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*
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* data type definitions, declarations, prototypes and macros.
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*
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* Started by: Thomas Gleixner and Ingo Molnar
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*
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* Credits:
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*
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* Roman Zippel provided the ideas and primary code snippets of
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* the ktime_t union and further simplifications of the original
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* code.
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*
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* For licencing details see kernel-base/COPYING
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*/
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#ifndef _LINUX_KTIME_H
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#define _LINUX_KTIME_H
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#include <linux/time.h>
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#include <linux/jiffies.h>
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/* Nanosecond scalar representation for kernel time values */
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typedef s64 ktime_t;
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/**
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* ktime_set - Set a ktime_t variable from a seconds/nanoseconds value
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* @secs: seconds to set
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* @nsecs: nanoseconds to set
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*
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* Return: The ktime_t representation of the value.
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*/
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static inline ktime_t ktime_set(const s64 secs, const unsigned long nsecs)
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{
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if (unlikely(secs >= KTIME_SEC_MAX))
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return KTIME_MAX;
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return secs * NSEC_PER_SEC + (s64)nsecs;
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}
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/* Subtract two ktime_t variables. rem = lhs -rhs: */
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#define ktime_sub(lhs, rhs) ((lhs) - (rhs))
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/* Add two ktime_t variables. res = lhs + rhs: */
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#define ktime_add(lhs, rhs) ((lhs) + (rhs))
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/*
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* Same as ktime_add(), but avoids undefined behaviour on overflow; however,
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* this means that you must check the result for overflow yourself.
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*/
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#define ktime_add_unsafe(lhs, rhs) ((u64) (lhs) + (rhs))
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/*
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* Add a ktime_t variable and a scalar nanosecond value.
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* res = kt + nsval:
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*/
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#define ktime_add_ns(kt, nsval) ((kt) + (nsval))
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/*
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* Subtract a scalar nanosecod from a ktime_t variable
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* res = kt - nsval:
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*/
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#define ktime_sub_ns(kt, nsval) ((kt) - (nsval))
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/* convert a timespec64 to ktime_t format: */
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static inline ktime_t timespec64_to_ktime(struct timespec64 ts)
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{
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return ktime_set(ts.tv_sec, ts.tv_nsec);
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}
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/* Map the ktime_t to timespec conversion to ns_to_timespec function */
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#define ktime_to_timespec64(kt) ns_to_timespec64((kt))
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/* Convert ktime_t to nanoseconds */
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static inline s64 ktime_to_ns(const ktime_t kt)
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{
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return kt;
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}
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/**
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* ktime_compare - Compares two ktime_t variables for less, greater or equal
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* @cmp1: comparable1
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* @cmp2: comparable2
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*
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* Return: ...
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* cmp1 < cmp2: return <0
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* cmp1 == cmp2: return 0
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* cmp1 > cmp2: return >0
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*/
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static inline int ktime_compare(const ktime_t cmp1, const ktime_t cmp2)
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{
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if (cmp1 < cmp2)
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return -1;
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if (cmp1 > cmp2)
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return 1;
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return 0;
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}
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/**
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* ktime_after - Compare if a ktime_t value is bigger than another one.
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* @cmp1: comparable1
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* @cmp2: comparable2
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*
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* Return: true if cmp1 happened after cmp2.
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*/
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static inline bool ktime_after(const ktime_t cmp1, const ktime_t cmp2)
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{
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return ktime_compare(cmp1, cmp2) > 0;
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}
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/**
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* ktime_before - Compare if a ktime_t value is smaller than another one.
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* @cmp1: comparable1
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* @cmp2: comparable2
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*
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* Return: true if cmp1 happened before cmp2.
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*/
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static inline bool ktime_before(const ktime_t cmp1, const ktime_t cmp2)
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{
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return ktime_compare(cmp1, cmp2) < 0;
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}
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#if BITS_PER_LONG < 64
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extern s64 __ktime_divns(const ktime_t kt, s64 div);
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static inline s64 ktime_divns(const ktime_t kt, s64 div)
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{
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/*
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* Negative divisors could cause an inf loop,
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* so bug out here.
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*/
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BUG_ON(div < 0);
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if (__builtin_constant_p(div) && !(div >> 32)) {
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s64 ns = kt;
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u64 tmp = ns < 0 ? -ns : ns;
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do_div(tmp, div);
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return ns < 0 ? -tmp : tmp;
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} else {
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return __ktime_divns(kt, div);
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}
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}
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#else /* BITS_PER_LONG < 64 */
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static inline s64 ktime_divns(const ktime_t kt, s64 div)
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{
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/*
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* 32-bit implementation cannot handle negative divisors,
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* so catch them on 64bit as well.
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*/
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WARN_ON(div < 0);
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return kt / div;
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}
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#endif
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static inline s64 ktime_to_us(const ktime_t kt)
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{
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return ktime_divns(kt, NSEC_PER_USEC);
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}
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static inline s64 ktime_to_ms(const ktime_t kt)
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{
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return ktime_divns(kt, NSEC_PER_MSEC);
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}
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static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
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{
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return ktime_to_us(ktime_sub(later, earlier));
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}
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static inline s64 ktime_ms_delta(const ktime_t later, const ktime_t earlier)
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{
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return ktime_to_ms(ktime_sub(later, earlier));
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}
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static inline ktime_t ktime_add_us(const ktime_t kt, const u64 usec)
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{
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return ktime_add_ns(kt, usec * NSEC_PER_USEC);
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}
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static inline ktime_t ktime_add_ms(const ktime_t kt, const u64 msec)
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{
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return ktime_add_ns(kt, msec * NSEC_PER_MSEC);
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}
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static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec)
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{
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return ktime_sub_ns(kt, usec * NSEC_PER_USEC);
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}
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static inline ktime_t ktime_sub_ms(const ktime_t kt, const u64 msec)
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{
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return ktime_sub_ns(kt, msec * NSEC_PER_MSEC);
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}
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extern ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs);
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/**
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* ktime_to_timespec64_cond - convert a ktime_t variable to timespec64
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* format only if the variable contains data
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* @kt: the ktime_t variable to convert
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* @ts: the timespec variable to store the result in
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*
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* Return: %true if there was a successful conversion, %false if kt was 0.
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*/
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static inline __must_check bool ktime_to_timespec64_cond(const ktime_t kt,
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struct timespec64 *ts)
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{
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if (kt) {
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*ts = ktime_to_timespec64(kt);
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return true;
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} else {
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return false;
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}
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}
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#include <vdso/ktime.h>
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static inline ktime_t ns_to_ktime(u64 ns)
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{
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return ns;
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}
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static inline ktime_t ms_to_ktime(u64 ms)
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{
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return ms * NSEC_PER_MSEC;
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}
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# include <linux/timekeeping.h>
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# include <linux/timekeeping32.h>
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#endif
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