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| author | Pavel Tatashin <pasha.tatashin@oracle.com> | 2018-07-19 23:55:40 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-07-20 01:02:42 +0300 |
| commit | 4763f03d3d186ce8a1125844790152d76804ad60 (patch) | |
| tree | e9167caff8aa0890284c184ebc3952ec8329d6c9 | |
| parent | e2a9ca29b5edc89da2fddeae30e1070b272395c5 (diff) | |
| download | linux-4763f03d3d186ce8a1125844790152d76804ad60.tar.xz | |
x86/tsc: Use TSC as sched clock early
All prerequesites for enabling TSC as sched clock early in the boot
process are available now:
- Early attempt of TSC calibration
- Early availablity of static branch patching
If TSC frequency can be established in the early calibration, enable the
static key which switches sched clock to use TSC.
[ tglx: Massaged changelog ]
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: steven.sistare@oracle.com
Cc: daniel.m.jordan@oracle.com
Cc: linux@armlinux.org.uk
Cc: schwidefsky@de.ibm.com
Cc: heiko.carstens@de.ibm.com
Cc: john.stultz@linaro.org
Cc: sboyd@codeaurora.org
Cc: hpa@zytor.com
Cc: douly.fnst@cn.fujitsu.com
Cc: peterz@infradead.org
Cc: prarit@redhat.com
Cc: feng.tang@intel.com
Cc: pmladek@suse.com
Cc: gnomes@lxorguk.ukuu.org.uk
Cc: linux-s390@vger.kernel.org
Cc: boris.ostrovsky@oracle.com
Cc: jgross@suse.com
Cc: pbonzini@redhat.com
Link: https://lkml.kernel.org/r/20180719205545.16512-22-pasha.tatashin@oracle.com
| -rw-r--r-- | arch/x86/kernel/tsc.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 7ea0718a4c75..9277ae9b68b3 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -1408,6 +1408,7 @@ void __init tsc_early_init(void) /* Sanitize TSC ADJUST before cyc2ns gets initialized */ tsc_store_and_check_tsc_adjust(true); cyc2ns_init_boot_cpu(); + static_branch_enable(&__use_tsc); } void __init tsc_init(void) |