mirror of
https://github.com/torvalds/linux.git
synced 2024-11-07 04:32:03 +00:00
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
/*
|
|
* linux/arch/arm/lib/xor-neon.c
|
|
*
|
|
* Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/raid/xor.h>
|
|
#include <linux/module.h>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
#ifndef __ARM_NEON__
|
|
#error You should compile this file with '-mfloat-abi=softfp -mfpu=neon'
|
|
#endif
|
|
|
|
/*
|
|
* Pull in the reference implementations while instructing GCC (through
|
|
* -ftree-vectorize) to attempt to exploit implicit parallelism and emit
|
|
* NEON instructions.
|
|
*/
|
|
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
|
|
#pragma GCC optimize "tree-vectorize"
|
|
#else
|
|
/*
|
|
* While older versions of GCC do not generate incorrect code, they fail to
|
|
* recognize the parallel nature of these functions, and emit plain ARM code,
|
|
* which is known to be slower than the optimized ARM code in asm-arm/xor.h.
|
|
*/
|
|
#warning This code requires at least version 4.6 of GCC
|
|
#endif
|
|
|
|
#pragma GCC diagnostic ignored "-Wunused-variable"
|
|
#include <asm-generic/xor.h>
|
|
|
|
struct xor_block_template const xor_block_neon_inner = {
|
|
.name = "__inner_neon__",
|
|
.do_2 = xor_8regs_2,
|
|
.do_3 = xor_8regs_3,
|
|
.do_4 = xor_8regs_4,
|
|
.do_5 = xor_8regs_5,
|
|
};
|
|
EXPORT_SYMBOL(xor_block_neon_inner);
|