[Qemu-devel] [PATCH v5 01/15] bitops: Add MAKE_64BIT_MASK macro

[Alistair Francis]

Add a macro that creates a 64bit value which has length number of ones
shifted acrros by the value of shift.

Signed-off-by: Alistair Francis <address@hidden>
---
V5:
 - Re-write to a 64-bit mask instead of ONES()
 - Re-order this patch in the series

 include/qemu/bitops.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 755fdd1..3c45791 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -24,6 +24,9 @@
 #define BIT_WORD(nr)            ((nr) / BITS_PER_LONG)
 #define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
 
+#define MAKE_64BIT_MASK(shift, length) \
+    (((1ull << (length)) - 1) << shift)
+
 /**
  * set_bit - Set a bit in memory
  * @nr: the bit to set
-- 
2.5.0