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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
40 lines
803 B
C
40 lines
803 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2016 ARM Ltd.
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*/
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#ifndef __ASM_CHECKSUM_H
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#define __ASM_CHECKSUM_H
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#include <linux/types.h>
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static inline __sum16 csum_fold(__wsum csum)
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{
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u32 sum = (__force u32)csum;
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sum += (sum >> 16) | (sum << 16);
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return ~(__force __sum16)(sum >> 16);
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}
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#define csum_fold csum_fold
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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__uint128_t tmp;
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u64 sum;
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tmp = *(const __uint128_t *)iph;
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iph += 16;
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ihl -= 4;
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tmp += ((tmp >> 64) | (tmp << 64));
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sum = tmp >> 64;
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do {
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sum += *(const u32 *)iph;
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iph += 4;
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} while (--ihl);
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sum += ((sum >> 32) | (sum << 32));
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return csum_fold((__force u32)(sum >> 32));
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}
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#define ip_fast_csum ip_fast_csum
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#include <asm-generic/checksum.h>
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#endif /* __ASM_CHECKSUM_H */
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