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[Qemu-devel] [PATCH v5 01/15] bitops: Add MAKE_64BIT_MASK macro
From: |
Alistair Francis |
Subject: |
[Qemu-devel] [PATCH v5 01/15] bitops: Add MAKE_64BIT_MASK macro |
Date: |
Tue, 8 Mar 2016 13:06:32 -0800 |
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