Date: Fri, 10 Jul 2020 12:06:18 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r363078 - head/sys/compat/linuxkpi/common/include/linux Message-ID: <202007101206.06AC6Iah011825@repo.freebsd.org>
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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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