Author: hselasky
Date: Fri Jul 10 12:06:18 2020
New Revision: 363078
URL: https://svnweb.freebsd.org/changeset/base/363078
Log:
Implement the bitmap_subset() function in the LinuxKPI. This function
checks if the bitmap pointed to by the first argument is a subset of
the bitmap pointed to by the second argument. The function returns one
on success and zero on failure.
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/include/linux/bitmap.h
Modified: head/sys/compat/linuxkpi/common/include/linux/bitmap.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/bitmap.h Fri Jul 10
11:27:54 2020 (r363077)
+++ head/sys/compat/linuxkpi/common/include/linux/bitmap.h Fri Jul 10
12:06:18 2020 (r363078)
@@ -244,6 +244,28 @@ bitmap_equal(const unsigned long *pa,
return (1);
}
+static inline int
+bitmap_subset(const unsigned long *pa,
+ const unsigned long *pb, unsigned size)
+{
+ const unsigned end = BIT_WORD(size);
+ const unsigned tail = size & (BITS_PER_LONG - 1);
+ unsigned i;
+
+ for (i = 0; i != end; i++) {
+ if (pa[i] & ~pb[i])
+ return (0);
+ }
+
+ if (tail) {
+ const unsigned long mask = BITMAP_LAST_WORD_MASK(tail);
+
+ if (pa[end] & ~pb[end] & mask)
+ return (0);
+ }
+ return (1);
+}
+
static inline void
bitmap_complement(unsigned long *dst, const unsigned long *src,
const unsigned int size)
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