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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9319206d71
Commit 0195659 introduced a NEON accelerated version of the xor_blocks()
function, but it needs the changes in this patch to allow it to be built
as a module rather than statically into the kernel.
This patch creates a separate module xor-neon.ko which exports the NEON
inner xor_blocks() functions depended upon by the regular xor.ko if it
is built with CONFIG_KERNEL_MODE_NEON=y
Reported-by: Josh Boyer <jwboyer@fedoraproject.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
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* linux/arch/arm/lib/xor-neon.c
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*
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* Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/raid/xor.h>
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#include <linux/module.h>
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MODULE_LICENSE("GPL");
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#ifndef __ARM_NEON__
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#error You should compile this file with '-mfloat-abi=softfp -mfpu=neon'
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#endif
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/*
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* Pull in the reference implementations while instructing GCC (through
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* -ftree-vectorize) to attempt to exploit implicit parallelism and emit
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* NEON instructions.
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*/
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#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
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#pragma GCC optimize "tree-vectorize"
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#else
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/*
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* While older versions of GCC do not generate incorrect code, they fail to
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* recognize the parallel nature of these functions, and emit plain ARM code,
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* which is known to be slower than the optimized ARM code in asm-arm/xor.h.
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*/
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#warning This code requires at least version 4.6 of GCC
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#endif
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#pragma GCC diagnostic ignored "-Wunused-variable"
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#include <asm-generic/xor.h>
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struct xor_block_template const xor_block_neon_inner = {
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.name = "__inner_neon__",
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.do_2 = xor_8regs_2,
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.do_3 = xor_8regs_3,
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.do_4 = xor_8regs_4,
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.do_5 = xor_8regs_5,
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};
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EXPORT_SYMBOL(xor_block_neon_inner);
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