Author: hselasky
Date: Thu Feb 23 09:53:54 2017
New Revision: 314136
URL: https://svnweb.freebsd.org/changeset/base/314136
Log:
Implement __test_and_clear_bit() and __test_and_set_bit() in the LinuxKPI.
The clang compiler will optimise these functions down to three AMD64
instructions if the bit argument is a constant during compilation.
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/include/linux/bitops.h
Modified: head/sys/compat/linuxkpi/common/include/linux/bitops.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/bitops.h Thu Feb 23
09:52:22 2017 (r314135)
+++ head/sys/compat/linuxkpi/common/include/linux/bitops.h Thu Feb 23
09:53:54 2017 (r314136)
@@ -338,6 +338,21 @@ test_and_clear_bit(long bit, volatile un
}
static inline int
+__test_and_clear_bit(long bit, volatile unsigned long *var)
+{
+ long val;
+
+ var += BIT_WORD(bit);
+ bit %= BITS_PER_LONG;
+ bit = (1UL << bit);
+
+ val = *var;
+ *var &= ~bit;
+
+ return !!(val & bit);
+}
+
+static inline int
test_and_set_bit(long bit, volatile unsigned long *var)
{
long val;
@@ -352,6 +367,21 @@ test_and_set_bit(long bit, volatile unsi
return !!(val & bit);
}
+static inline int
+__test_and_set_bit(long bit, volatile unsigned long *var)
+{
+ long val;
+
+ var += BIT_WORD(bit);
+ bit %= BITS_PER_LONG;
+ bit = (1UL << bit);
+
+ val = *var;
+ *var |= bit;
+
+ return !!(val & bit);
+}
+
static inline void
bitmap_set(unsigned long *map, int start, int nr)
{
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