92 lines
2.5 KiB
Diff
92 lines
2.5 KiB
Diff
--- a/compat/Makefile
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+++ b/compat/Makefile
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@@ -38,3 +38,8 @@ compat-$(CONFIG_COMPAT_KERNEL_3_1) += \
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cordic.o \
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crc8.o
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+ifndef CONFIG_64BIT
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+ifndef CONFIG_GENERIC_ATOMIC64
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+ compat-y += compat_atomic.o
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+endif
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+endif
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--- a/include/linux/compat-2.6.31.h
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+++ b/include/linux/compat-2.6.31.h
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@@ -202,6 +202,20 @@ void compat_synchronize_threaded_irq(str
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#define skb_walk_frags(skb, iter) \
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for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next)
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+#ifndef CONFIG_64BIT
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+
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+typedef struct {
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+ long long counter;
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+} atomic64_t;
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+
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+extern long long atomic64_read(const atomic64_t *v);
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+extern long long atomic64_add_return(long long a, atomic64_t *v);
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+
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+#define atomic64_inc_return(v) atomic64_add_return(1LL, (v))
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+
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+#endif
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+
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+
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#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31)) */
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#endif /* LINUX_26_31_COMPAT_H */
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--- /dev/null
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+++ b/compat/compat_atomic.c
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@@ -0,0 +1,33 @@
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+#include <linux/spinlock.h>
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+#include <linux/module.h>
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+
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+#if !((LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)) && (defined(CONFIG_UML) || defined(CONFIG_X86))) && !((LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)) && defined(CONFIG_ARM) && !defined(CONFIG_GENERIC_ATOMIC64))
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+
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+static DEFINE_SPINLOCK(lock);
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+
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+long long atomic64_read(const atomic64_t *v)
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+{
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+ unsigned long flags;
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+ long long val;
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+
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+ spin_lock_irqsave(&lock, flags);
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+ val = v->counter;
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+ spin_unlock_irqrestore(&lock, flags);
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+ return val;
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+}
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+EXPORT_SYMBOL(atomic64_read);
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+
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+long long atomic64_add_return(long long a, atomic64_t *v)
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+{
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+ unsigned long flags;
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+ long long val;
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+
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+ spin_lock_irqsave(&lock, flags);
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+ val = v->counter += a;
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+ spin_unlock_irqrestore(&lock, flags);
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+ return val;
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+}
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+EXPORT_SYMBOL(atomic64_add_return);
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+
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+#endif
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+
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--- a/include/linux/compat-3.1.h
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+++ b/include/linux/compat-3.1.h
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@@ -19,6 +19,18 @@
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.prod_id = { NULL, NULL, (v3), NULL }, \
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.prod_id_hash = { 0, 0, (vh3), 0 }, }
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+/*
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+ * In many versions, several architectures do not seem to include an
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+ * atomic64_t implementation, and do not include the software emulation from
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+ * asm-generic/atomic64_t.
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+ * Detect and handle this here.
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+ */
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+#include <asm/atomic.h>
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+
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+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)) && !defined(ATOMIC64_INIT) && !defined(CONFIG_X86) && !((LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)) && defined(CONFIG_ARM) && !defined(CONFIG_GENERIC_ATOMIC64))
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+#include <asm-generic/atomic64.h>
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+#endif
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+
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#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0)) */
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#endif /* LINUX_3_1_COMPAT_H */
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