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Subject[PATCH 12/20] x86/pvticketlock: use callee-save for unlock_kick as well
Date
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

The unlock code is typically inlined throughout the kernel, so its useful
to make sure there's minimal register pressure overhead from the presence
of the unlock_tick pvop call.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
arch/x86/include/asm/paravirt.h | 2 +-
arch/x86/include/asm/paravirt_types.h | 2 +-
arch/x86/kernel/paravirt-spinlocks.c | 2 +-
arch/x86/xen/spinlock.c | 3 ++-
4 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index dbd5914..b6ff89a 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -729,7 +729,7 @@ static inline void __ticket_lock_spinning(struct arch_spinlock *lock, unsigned t

static inline void ____ticket_unlock_kick(struct arch_spinlock *lock, unsigned ticket)
{
- PVOP_VCALL2(pv_lock_ops.unlock_kick, lock, ticket);
+ PVOP_VCALLEE2(pv_lock_ops.unlock_kick, lock, ticket);
}

#endif
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 9ad6d088..bb02831 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -317,7 +317,7 @@ struct pv_mmu_ops {
struct arch_spinlock;
struct pv_lock_ops {
struct paravirt_callee_save lock_spinning;
- void (*unlock_kick)(struct arch_spinlock *lock, unsigned ticket);
+ struct paravirt_callee_save unlock_kick;
};

/* This contains all the paravirt structures: we get a convenient
diff --git a/arch/x86/kernel/paravirt-spinlocks.c b/arch/x86/kernel/paravirt-spinlocks.c
index 4251c1d..efad219 100644
--- a/arch/x86/kernel/paravirt-spinlocks.c
+++ b/arch/x86/kernel/paravirt-spinlocks.c
@@ -10,7 +10,7 @@
struct pv_lock_ops pv_lock_ops = {
#ifdef CONFIG_SMP
.lock_spinning = __PV_IS_CALLEE_SAVE(paravirt_nop),
- .unlock_kick = paravirt_nop,
+ .unlock_kick = __PV_IS_CALLEE_SAVE(paravirt_nop),
#endif
};
EXPORT_SYMBOL(pv_lock_ops);
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index 2bd51d8..bf2f409 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -159,6 +159,7 @@ static void xen_unlock_kick(struct arch_spinlock *lock, unsigned next)
}
}
}
+PV_CALLEE_SAVE_REGS_THUNK(xen_unlock_kick);

static irqreturn_t dummy_handler(int irq, void *dev_id)
{
@@ -195,7 +196,7 @@ void xen_uninit_lock_cpu(int cpu)
void __init xen_init_spinlocks(void)
{
pv_lock_ops.lock_spinning = PV_CALLEE_SAVE(xen_lock_spinning);
- pv_lock_ops.unlock_kick = xen_unlock_kick;
+ pv_lock_ops.unlock_kick = PV_CALLEE_SAVE(xen_unlock_kick);
}

#ifdef CONFIG_XEN_DEBUG_FS
--
1.7.2.3


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