forked from luck/tmp_suning_uos_patched
f8c269d722
Switch to div_u64 if the divisor is a numeric constant or sum of sizeof()s. We can remove a few instances of do_div that has the hidden semtantics of changing the 1st argument. Small power-of-two divisors are converted to bitshifts, large values are kept intact for clarity. Signed-off-by: David Sterba <dsterba@suse.cz>
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
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/*
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* Copyright (C) 2012 Fujitsu. All rights reserved.
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* Written by Miao Xie <miaox@cn.fujitsu.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_MATH_H
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#define __BTRFS_MATH_H
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#include <asm/div64.h>
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static inline u64 div_factor(u64 num, int factor)
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{
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if (factor == 10)
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return num;
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num *= factor;
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return div_u64(num, 10);
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}
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static inline u64 div_factor_fine(u64 num, int factor)
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{
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if (factor == 100)
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return num;
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num *= factor;
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return div_u64(num, 100);
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}
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#endif
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