FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/lib/libspl/include/os/linux/sys/sysmacros.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License, Version 1.0 only
      * (the "License").  You may not use this file except in compliance
      * with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    #ifndef _LIBSPL_SYS_SYSMACROS_H
    #define _LIBSPL_SYS_SYSMACROS_H
    
    #include_next <sys/sysmacros.h>
    
    /* common macros */
    #ifndef MIN
    #define MIN(a, b)       ((a) < (b) ? (a) : (b))
    #endif
    #ifndef MAX
    #define MAX(a, b)       ((a) < (b) ? (b) : (a))
    #endif
    #ifndef ABS
    #define ABS(a)          ((a) < 0 ? -(a) : (a))
    #endif
    #ifndef ARRAY_SIZE
    #define ARRAY_SIZE(a) (sizeof (a) / sizeof (a[0]))
    #endif
    #ifndef DIV_ROUND_UP
    #define DIV_ROUND_UP(n, d)      (((n) + (d) - 1) / (d))
    #endif
    
    #define makedevice(maj, min)    makedev(maj, min)
    #define _sysconf(a)             sysconf(a)
    
    /*
     * Compatibility macros/typedefs needed for Solaris -> Linux port
     */
    #define P2ALIGN(x, align)       ((x) & -(align))
    #define P2CROSS(x, y, align)    (((x) ^ (y)) > (align) - 1)
    #define P2ROUNDUP(x, align)     ((((x) - 1) | ((align) - 1)) + 1)
    #define P2BOUNDARY(off, len, align) \
                                    (((off) ^ ((off) + (len) - 1)) > (align) - 1)
    #define P2PHASE(x, align)       ((x) & ((align) - 1))
    #define P2NPHASE(x, align)      (-(x) & ((align) - 1))
    #define P2NPHASE_TYPED(x, align, type) \
                                    (-(type)(x) & ((type)(align) - 1))
    #define ISP2(x)                 (((x) & ((x) - 1)) == 0)
    #define IS_P2ALIGNED(v, a)      ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
    
    /*
     * Typed version of the P2* macros.  These macros should be used to ensure
     * that the result is correctly calculated based on the data type of (x),
     * which is passed in as the last argument, regardless of the data
     * type of the alignment.  For example, if (x) is of type uint64_t,
     * and we want to round it up to a page boundary using "PAGESIZE" as
     * the alignment, we can do either
     *      P2ROUNDUP(x, (uint64_t)PAGESIZE)
     * or
     *      P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
     */
    #define P2ALIGN_TYPED(x, align, type)           \
            ((type)(x) & -(type)(align))
    #define P2PHASE_TYPED(x, align, type)           \
            ((type)(x) & ((type)(align) - 1))
    #define P2NPHASE_TYPED(x, align, type)          \
            (-(type)(x) & ((type)(align) - 1))
    #define P2ROUNDUP_TYPED(x, align, type)         \
            ((((type)(x) - 1) | ((type)(align) - 1)) + 1)
    #define P2END_TYPED(x, align, type)             \
            (-(~(type)(x) & -(type)(align)))
    #define P2PHASEUP_TYPED(x, align, phase, type)  \
            ((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
    #define P2CROSS_TYPED(x, y, align, type)        \
            (((type)(x) ^ (type)(y)) > (type)(align) - 1)
    #define P2SAMEHIGHBIT_TYPED(x, y, type)         \
            (((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))
    
    
    /* avoid any possibility of clashing with <stddef.h> version */
    #if defined(_KERNEL) && !defined(_KMEMUSER) && !defined(offsetof)
    #define offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
    #endif
   
   #endif /* _LIBSPL_SYS_SYSMACROS_H */

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