linux-kernel - [PATCH] s390x/spinlock: Provide vcpu_is

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Date:   Thu, 29 Sep 2016 13:54:16 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>
Cc:     Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        xen-devel-request@...ts.xenproject.org, benh@...nel.crashing.org,
        paulus@...ba.org, mpe@...erman.id.au, mingo@...hat.com,
        paulmck@...ux.vnet.ibm.com, will.deacon@....com,
        kernellwp@...il.com, jgross@...e.com, pbonzini@...hat.com,
        bsingharora@...il.com,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: [PATCH] s390x/spinlock: Provide vcpu_is_preempted globally

this implements the s390 backend for commit
"kernel/sched: introduce vcpu preempted check interface"
by simply reusing the existing cpu_is_preempted function.

Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
---
Martin, Heiko,

this patch is a minimal change by not touching all existing users of
cpu_is_preempted in spinlock.c. If you want it differently, let me
know.


 arch/s390/include/asm/spinlock.h | 7 +++++++
 arch/s390/lib/spinlock.c         | 3 ++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/s390/include/asm/spinlock.h b/arch/s390/include/asm/spinlock.h
index 63ebf37..6e82986 100644
--- a/arch/s390/include/asm/spinlock.h
+++ b/arch/s390/include/asm/spinlock.h
@@ -21,6 +21,13 @@ _raw_compare_and_swap(unsigned int *lock, unsigned int old, unsigned int new)
 	return __sync_bool_compare_and_swap(lock, old, new);
 }
 
+int arch_vcpu_is_preempted(int cpu);
+#define vcpu_is_preempted cpu_is_preempted
+static inline bool cpu_is_preempted(int cpu)
+{
+	return arch_vcpu_is_preempted(cpu);
+}
+
 /*
  * Simple spin lock operations.  There are two variants, one clears IRQ's
  * on the local processor, one does not.
diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c
index e5f50a7..9f473c8 100644
--- a/arch/s390/lib/spinlock.c
+++ b/arch/s390/lib/spinlock.c
@@ -37,7 +37,7 @@ static inline void _raw_compare_and_delay(unsigned int *lock, unsigned int old)
 	asm(".insn rsy,0xeb0000000022,%0,0,%1" : : "d" (old), "Q" (*lock));
 }
 
-static inline int cpu_is_preempted(int cpu)
+int arch_vcpu_is_preempted(int cpu)
 {
 	if (test_cpu_flag_of(CIF_ENABLED_WAIT, cpu))
 		return 0;
@@ -45,6 +45,7 @@ static inline int cpu_is_preempted(int cpu)
 		return 0;
 	return 1;
 }
+EXPORT_SYMBOL(arch_vcpu_is_preempted);
 
 void arch_spin_lock_wait(arch_spinlock_t *lp)
 {
-- 
2.5.5