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x86/tsc: Make CONFIG_X86_TSC=n build work again 

tsc_async_resets is only available when CONFIG_X86_TSC=y. So a build with
CONFIG_X86_TSC=n breaks:

arch/x86/kernel/tsc.o: In function `tsc_init':
(.init.text+0x87b): undefined reference to `tsc_async_resets'

Add a stub define for the TSC=n case.

Side note: This config switch should simply be removed.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Fixes: 341102c3ef ("x86/tsc: Add option that TSC on Socket 0 being non-zero is valid")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mike Travis <mike.travis@hpe.com>
This commit is contained in:
Thomas Gleixner 2017-10-17 08:49:37 +02:00
parent 97d21003df
commit c0fc9b1350
1 changed files with 4 additions and 0 deletions
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4
arch/x86/include/asm/tsc.h
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@ -42,7 +42,11 @@ extern unsigned long native_calibrate_tsc(void);
extern unsigned long long native_sched_clock_from_tsc(u64 tsc); extern unsigned long long native_sched_clock_from_tsc(u64 tsc);
extern int tsc_clocksource_reliable; extern int tsc_clocksource_reliable;
#ifdef CONFIG_X86_TSC
extern bool tsc_async_resets; extern bool tsc_async_resets;
#else
# define tsc_async_resets false
#endif
/* /*
* Boot-time check whether the TSCs are synchronized across * Boot-time check whether the TSCs are synchronized across