Initial file dump from open source releaseHEADmaster

1 files changed, 133 insertions, 0 deletions

diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h
new file mode 100644
index 00000000..86fe0ee2
--- /dev/null
+++ b/arch/s390/include/asm/percpu.h
@@ -0,0 +1,133 @@
+#ifndef __ARCH_S390_PERCPU__
+#define __ARCH_S390_PERCPU__
+
+#include <linux/preempt.h>
+#include <asm/cmpxchg.h>
+
+/*
+ * s390 uses its own implementation for per cpu data, the offset of
+ * the cpu local data area is cached in the cpu's lowcore memory.
+ */
+#define __my_cpu_offset S390_lowcore.percpu_offset
+
+/*
+ * For 64 bit module code, the module may be more than 4G above the
+ * per cpu area, use weak definitions to force the compiler to
+ * generate external references.
+ */
+#if defined(CONFIG_SMP) && defined(CONFIG_64BIT) && defined(MODULE)
+#define ARCH_NEEDS_WEAK_PER_CPU
+#endif
+
+#define arch_this_cpu_to_op(pcp, val, op)				\
+({									\
+	typedef typeof(pcp) pcp_op_T__;					\
+	pcp_op_T__ old__, new__, prev__;				\
+	pcp_op_T__ *ptr__;						\
+	preempt_disable();						\
+	ptr__ = __this_cpu_ptr(&(pcp));					\
+	prev__ = *ptr__;						\
+	do {								\
+		old__ = prev__;						\
+		new__ = old__ op (val);					\
+		switch (sizeof(*ptr__)) {				\
+		case 8:							\
+			prev__ = cmpxchg64(ptr__, old__, new__);	\
+			break;						\
+		default:						\
+			prev__ = cmpxchg(ptr__, old__, new__);		\
+		}							\
+	} while (prev__ != old__);					\
+	preempt_enable();						\
+	new__;								\
+})
+
+#define this_cpu_add_1(pcp, val) arch_this_cpu_to_op(pcp, val, +)
+#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op(pcp, val, +)
+#define this_cpu_add_4(pcp, val) arch_this_cpu_to_op(pcp, val, +)
+#define this_cpu_add_8(pcp, val) arch_this_cpu_to_op(pcp, val, +)
+
+#define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op(pcp, val, +)
+#define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op(pcp, val, +)
+#define this_cpu_add_return_4(pcp, val) arch_this_cpu_to_op(pcp, val, +)
+#define this_cpu_add_return_8(pcp, val) arch_this_cpu_to_op(pcp, val, +)
+
+#define this_cpu_and_1(pcp, val) arch_this_cpu_to_op(pcp, val, &)
+#define this_cpu_and_2(pcp, val) arch_this_cpu_to_op(pcp, val, &)
+#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, &)
+#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op(pcp, val, &)
+
+#define this_cpu_or_1(pcp, val) arch_this_cpu_to_op(pcp, val, |)
+#define this_cpu_or_2(pcp, val) arch_this_cpu_to_op(pcp, val, |)
+#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op(pcp, val, |)
+#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op(pcp, val, |)
+
+#define this_cpu_xor_1(pcp, val) arch_this_cpu_to_op(pcp, val, ^)
+#define this_cpu_xor_2(pcp, val) arch_this_cpu_to_op(pcp, val, ^)
+#define this_cpu_xor_4(pcp, val) arch_this_cpu_to_op(pcp, val, ^)
+#define this_cpu_xor_8(pcp, val) arch_this_cpu_to_op(pcp, val, ^)
+
+#define arch_this_cpu_cmpxchg(pcp, oval, nval)				\
+({									\
+	typedef typeof(pcp) pcp_op_T__;					\
+	pcp_op_T__ ret__;						\
+	pcp_op_T__ *ptr__;						\
+	preempt_disable();						\
+	ptr__ = __this_cpu_ptr(&(pcp));					\
+	switch (sizeof(*ptr__)) {					\
+	case 8:								\
+		ret__ = cmpxchg64(ptr__, oval, nval);			\
+		break;							\
+	default:							\
+		ret__ = cmpxchg(ptr__, oval, nval);			\
+	}								\
+	preempt_enable();						\
+	ret__;								\
+})
+
+#define this_cpu_cmpxchg_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
+#define this_cpu_cmpxchg_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
+#define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
+#define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
+
+#define arch_this_cpu_xchg(pcp, nval)					\
+({									\
+	typeof(pcp) *ptr__;						\
+	typeof(pcp) ret__;						\
+	preempt_disable();						\
+	ptr__ = __this_cpu_ptr(&(pcp));					\
+	ret__ = xchg(ptr__, nval);					\
+	preempt_enable();						\
+	ret__;								\
+})
+
+#define this_cpu_xchg_1(pcp, nval) arch_this_cpu_xchg(pcp, nval)
+#define this_cpu_xchg_2(pcp, nval) arch_this_cpu_xchg(pcp, nval)
+#define this_cpu_xchg_4(pcp, nval) arch_this_cpu_xchg(pcp, nval)
+#ifdef CONFIG_64BIT
+#define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
+#endif
+
+#define arch_this_cpu_cmpxchg_double(pcp1, pcp2, o1, o2, n1, n2)	\
+({									\
+	typeof(pcp1) o1__ = (o1), n1__ = (n1);				\
+	typeof(pcp2) o2__ = (o2), n2__ = (n2);				\
+	typeof(pcp1) *p1__;						\
+	typeof(pcp2) *p2__;						\
+	int ret__;							\
+	preempt_disable();						\
+	p1__ = __this_cpu_ptr(&(pcp1));					\
+	p2__ = __this_cpu_ptr(&(pcp2));					\
+	ret__ = __cmpxchg_double(p1__, p2__, o1__, o2__, n1__, n2__);	\
+	preempt_enable();						\
+	ret__;								\
+})
+
+#define this_cpu_cmpxchg_double_4 arch_this_cpu_cmpxchg_double
+#ifdef CONFIG_64BIT
+#define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
+#endif
+
+#include <asm-generic/percpu.h>
+
+#endif /* __ARCH_S390_PERCPU__ */