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locking/spinlocks/x86, paravirt: Remove paravirt_ticketlocks_enabled 

This is a follow-up of commit:

  cfd8983f03 ("x86, locking/spinlocks: Remove ticket (spin)lock implementation")

The static_key structure 'paravirt_ticketlocks_enabled' is now removed as it is
no longer used.

As a result, the init functions kvm_spinlock_init_jump() and
xen_init_spinlocks_jump() are also removed.

A simple build and boot test was done to verify it.

Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kvm@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/1484252878-1962-1-git-send-email-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Waiman Long 2017-01-12 15:27:58 -05:00 committed by Ingo Molnar
parent 6e03f66c00
commit aef591cd3d
4 changed files with 0 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/include/asm/spinlock.h
View File

@ -23,9 +23,6 @@
/* How long a lock should spin before we consider blocking */ /* How long a lock should spin before we consider blocking */
#define SPIN_THRESHOLD (1 << 15) #define SPIN_THRESHOLD (1 << 15)
extern struct static_key paravirt_ticketlocks_enabled;
static __always_inline bool static_key_false(struct static_key *key);
#include <asm/qspinlock.h> #include <asm/qspinlock.h>
/* /*

14
arch/x86/kernel/kvm.c
View File

@ -620,18 +620,4 @@ void __init kvm_spinlock_init(void)
} }
} }
static __init int kvm_spinlock_init_jump(void)
{
if (!kvm_para_available())
return 0;
if (!kvm_para_has_feature(KVM_FEATURE_PV_UNHALT))
return 0;
static_key_slow_inc(&paravirt_ticketlocks_enabled);
printk(KERN_INFO "KVM setup paravirtual spinlock\n");
return 0;
}
early_initcall(kvm_spinlock_init_jump);
#endif /* CONFIG_PARAVIRT_SPINLOCKS */ #endif /* CONFIG_PARAVIRT_SPINLOCKS */

3
arch/x86/kernel/paravirt-spinlocks.c
View File

@ -42,6 +42,3 @@ struct pv_lock_ops pv_lock_ops = {
#endif /* SMP */ #endif /* SMP */
}; };
EXPORT_SYMBOL(pv_lock_ops); EXPORT_SYMBOL(pv_lock_ops);
struct static_key paravirt_ticketlocks_enabled = STATIC_KEY_INIT_FALSE;
EXPORT_SYMBOL(paravirt_ticketlocks_enabled);

19
arch/x86/xen/spinlock.c
View File

@ -141,25 +141,6 @@ void __init xen_init_spinlocks(void)
pv_lock_ops.vcpu_is_preempted = PV_CALLEE_SAVE(xen_vcpu_stolen); pv_lock_ops.vcpu_is_preempted = PV_CALLEE_SAVE(xen_vcpu_stolen);
} }
/*
* While the jump_label init code needs to happend _after_ the jump labels are
* enabled and before SMP is started. Hence we use pre-SMP initcall level
* init. We cannot do it in xen_init_spinlocks as that is done before
* jump labels are activated.
*/
static __init int xen_init_spinlocks_jump(void)
{
if (!xen_pvspin)
return 0;
if (!xen_domain())
return 0;
static_key_slow_inc(&paravirt_ticketlocks_enabled);
return 0;
}
early_initcall(xen_init_spinlocks_jump);
static __init int xen_parse_nopvspin(char *arg) static __init int xen_parse_nopvspin(char *arg)
{ {
xen_pvspin = false; xen_pvspin = false;