FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/rtw89/util.h

     /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
      * Copyright(c) 2019-2020  Realtek Corporation
      */
     #ifndef __RTW89_UTIL_H__
     #define __RTW89_UTIL_H__
     
     #include "core.h"
     
     #define rtw89_iterate_vifs_bh(rtwdev, iterator, data)                          \
            ieee80211_iterate_active_interfaces_atomic((rtwdev)->hw,               \
                            IEEE80211_IFACE_ITER_NORMAL, iterator, data)
    
    /* call this function with rtwdev->mutex is held */
    #define rtw89_for_each_rtwvif(rtwdev, rtwvif)                                  \
            list_for_each_entry(rtwvif, &(rtwdev)->rtwvifs_list, list)
    
    /* The result of negative dividend and positive divisor is undefined, but it
     * should be one case of round-down or round-up. So, make it round-down if the
     * result is round-up.
     * Note: the maximum value of divisor is 0x7FFF_FFFF, because we cast it to
     *       signed value to make compiler to use signed divide instruction.
     */
    static inline s32 s32_div_u32_round_down(s32 dividend, u32 divisor, s32 *remainder)
    {
            s32 i_divisor = (s32)divisor;
            s32 i_remainder;
            s32 quotient;
    
            quotient = dividend / i_divisor;
            i_remainder = dividend % i_divisor;
    
            if (i_remainder < 0) {
                    quotient--;
                    i_remainder += i_divisor;
            }
    
            if (remainder)
                    *remainder = i_remainder;
            return quotient;
    }
    
    static inline s32 s32_div_u32_round_closest(s32 dividend, u32 divisor)
    {
            return s32_div_u32_round_down(dividend + divisor / 2, divisor, NULL);
    }
    
    #endif

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