[Xen-devel] [PATCH v2 04/23] xen/arm: sync_bitops

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

sync_bitops functions are equivalent to the SMP implementation of the
original functions, independently from CONFIG_SMP being defined.

We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But
under Xen you might be communicating with a completely external entity
who might be on another CPU (e.g. two uniprocessor guests communicating
via event channels and grant tables). So we need a variant of the bit
ops which are SMP safe even on a UP kernel.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 arch/arm/include/asm/sync_bitops.h |   27 +++++++++++++++++++++++++++
 1 files changed, 27 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/include/asm/sync_bitops.h

diff --git a/arch/arm/include/asm/sync_bitops.h 
b/arch/arm/include/asm/sync_bitops.h
new file mode 100644
index 0000000..63479ee
--- /dev/null
+++ b/arch/arm/include/asm/sync_bitops.h
@@ -0,0 +1,27 @@
+#ifndef __ASM_SYNC_BITOPS_H__
+#define __ASM_SYNC_BITOPS_H__
+
+#include <asm/bitops.h>
+#include <asm/system.h>
+
+/* sync_bitops functions are equivalent to the SMP implementation of the
+ * original functions, independently from CONFIG_SMP being defined.
+ *
+ * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But
+ * under Xen you might be communicating with a completely external entity
+ * who might be on another CPU (e.g. two uniprocessor guests communicating
+ * via event channels and grant tables). So we need a variant of the bit
+ * ops which are SMP safe even on a UP kernel.
+ */
+
+#define sync_set_bit(nr, p)            _set_bit(nr, p)
+#define sync_clear_bit(nr, p)          _clear_bit(nr, p)
+#define sync_change_bit(nr, p)         _change_bit(nr, p)
+#define sync_test_and_set_bit(nr, p)   _test_and_set_bit(nr, p)
+#define sync_test_and_clear_bit(nr, p) _test_and_clear_bit(nr, p)
+#define sync_test_and_change_bit(nr, p)        _test_and_change_bit(nr, p)
+#define sync_test_bit(nr, addr)                test_bit(nr, addr)
+#define sync_cmpxchg                   cmpxchg
+
+
+#endif
-- 
1.7.2.5


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