From owner-svn-src-head@freebsd.org Fri Jul 10 12:06:19 2020 Return-Path: Delivered-To: svn-src-head@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 7778B368688; Fri, 10 Jul 2020 12:06:19 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4B3BbH2YBWz4XTp; Fri, 10 Jul 2020 12:06:19 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 371B821A33; Fri, 10 Jul 2020 12:06:19 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 06AC6IeF011826; Fri, 10 Jul 2020 12:06:18 GMT (envelope-from hselasky@FreeBSD.org) Received: (from hselasky@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 06AC6Iah011825; Fri, 10 Jul 2020 12:06:18 GMT (envelope-from hselasky@FreeBSD.org) Message-Id: <202007101206.06AC6Iah011825@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: hselasky set sender to hselasky@FreeBSD.org using -f From: Hans Petter Selasky Date: Fri, 10 Jul 2020 12:06:18 +0000 (UTC) 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 X-SVN-Group: head X-SVN-Commit-Author: hselasky X-SVN-Commit-Paths: head/sys/compat/linuxkpi/common/include/linux X-SVN-Commit-Revision: 363078 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Jul 2020 12:06:19 -0000 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)