forked from Minki/linux
b836554386
Add the missing return statement to the inline stub
tsc_store_and_check_tsc_adjust() and add the other stubs to make a
SMP=y,TSC=n build happy.
While at it, remove the unused variable from the UP variant of
tsc_store_and_check_tsc_adjust().
Fixes: commit ba75fb646931 ("x86/tsc: Sync test only for the first cpu in a package")
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/*
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* x86 TSC related functions
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*/
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#ifndef _ASM_X86_TSC_H
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#define _ASM_X86_TSC_H
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#include <asm/processor.h>
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#define NS_SCALE 10 /* 2^10, carefully chosen */
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#define US_SCALE 32 /* 2^32, arbitralrily chosen */
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/*
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* Standard way to access the cycle counter.
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*/
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typedef unsigned long long cycles_t;
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extern unsigned int cpu_khz;
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extern unsigned int tsc_khz;
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extern void disable_TSC(void);
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static inline cycles_t get_cycles(void)
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{
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#ifndef CONFIG_X86_TSC
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if (!boot_cpu_has(X86_FEATURE_TSC))
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return 0;
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#endif
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return rdtsc();
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}
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extern struct system_counterval_t convert_art_to_tsc(cycle_t art);
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extern void tsc_init(void);
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extern void mark_tsc_unstable(char *reason);
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extern int unsynchronized_tsc(void);
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extern int check_tsc_unstable(void);
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extern unsigned long native_calibrate_cpu(void);
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extern unsigned long native_calibrate_tsc(void);
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extern unsigned long long native_sched_clock_from_tsc(u64 tsc);
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extern int tsc_clocksource_reliable;
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/*
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* Boot-time check whether the TSCs are synchronized across
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* all CPUs/cores:
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*/
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#ifdef CONFIG_X86_TSC
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extern bool tsc_store_and_check_tsc_adjust(void);
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extern void tsc_verify_tsc_adjust(void);
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extern void check_tsc_sync_source(int cpu);
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extern void check_tsc_sync_target(void);
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#else
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static inline bool tsc_store_and_check_tsc_adjust(void) { return false; }
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static inline void tsc_verify_tsc_adjust(void) { }
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static inline void check_tsc_sync_source(int cpu) { }
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static inline void check_tsc_sync_target(void) { }
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#endif
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extern int notsc_setup(char *);
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extern void tsc_save_sched_clock_state(void);
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extern void tsc_restore_sched_clock_state(void);
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unsigned long cpu_khz_from_msr(void);
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#endif /* _ASM_X86_TSC_H */
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