xor: move to lib/raid/

Move the RAID XOR code to lib/raid/ as it has nothing to do with the
crypto API.

Link: https://lkml.kernel.org/r/20260327061704.3707577-6-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Tested-by: Eric Biggers <ebiggers@kernel.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Mason <clm@fb.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: David Sterba <dsterba@suse.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Li Nan <linan122@huawei.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Magnus Lindholm <linmag7@gmail.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Song Liu <song@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Ted Ts'o <tytso@mit.edu>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

3 files changed, 0 insertions, 179 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index b4bb85e8e226..97d73136a0b4 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -2,8 +2,6 @@
 #
 # Generic algorithms support
 #
-config XOR_BLOCKS
-	tristate
 
 #
 # async_tx api: hardware offloaded memory transfer/transform support
diff --git a/crypto/Makefile b/crypto/Makefile
index 04e269117589..795c2eea51fe 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -196,7 +196,6 @@ obj-$(CONFIG_CRYPTO_ECRDSA) += ecrdsa_generic.o
 #
 # generic algorithms and the async_tx api
 #
-obj-$(CONFIG_XOR_BLOCKS) += xor.o
 obj-$(CONFIG_ASYNC_CORE) += async_tx/
 obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += asymmetric_keys/
 crypto_simd-y := simd.o
diff --git a/crypto/xor.c b/crypto/xor.c
deleted file mode 100644
index df530ddc9f06..000000000000
--- a/crypto/xor.c
+++ /dev/null
@@ -1,176 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * xor.c : Multiple Devices driver for Linux
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000,
- * Ingo Molnar, Matti Aarnio, Jakub Jelinek, Richard Henderson.
- *
- * Dispatch optimized RAID-5 checksumming functions.
- */
-
-#define BH_TRACE 0
-#include <linux/module.h>
-#include <linux/gfp.h>
-#include <linux/raid/xor.h>
-#include <linux/jiffies.h>
-#include <linux/preempt.h>
-#include <asm/xor.h>
-
-#ifndef XOR_SELECT_TEMPLATE
-#define XOR_SELECT_TEMPLATE(x) (x)
-#endif
-
-/* The xor routines to use.  */
-static struct xor_block_template *active_template;
-
-void
-xor_blocks(unsigned int src_count, unsigned int bytes, void *dest, void **srcs)
-{
-	unsigned long *p1, *p2, *p3, *p4;
-
-	WARN_ON_ONCE(!in_task() || irqs_disabled() || softirq_count());
-
-	p1 = (unsigned long *) srcs[0];
-	if (src_count == 1) {
-		active_template->do_2(bytes, dest, p1);
-		return;
-	}
-
-	p2 = (unsigned long *) srcs[1];
-	if (src_count == 2) {
-		active_template->do_3(bytes, dest, p1, p2);
-		return;
-	}
-
-	p3 = (unsigned long *) srcs[2];
-	if (src_count == 3) {
-		active_template->do_4(bytes, dest, p1, p2, p3);
-		return;
-	}
-
-	p4 = (unsigned long *) srcs[3];
-	active_template->do_5(bytes, dest, p1, p2, p3, p4);
-}
-EXPORT_SYMBOL(xor_blocks);
-
-/* Set of all registered templates.  */
-static struct xor_block_template *__initdata template_list;
-
-#ifndef MODULE
-static void __init do_xor_register(struct xor_block_template *tmpl)
-{
-	tmpl->next = template_list;
-	template_list = tmpl;
-}
-
-static int __init register_xor_blocks(void)
-{
-	active_template = XOR_SELECT_TEMPLATE(NULL);
-
-	if (!active_template) {
-#define xor_speed	do_xor_register
-		// register all the templates and pick the first as the default
-		XOR_TRY_TEMPLATES;
-#undef xor_speed
-		active_template = template_list;
-	}
-	return 0;
-}
-#endif
-
-#define BENCH_SIZE	4096
-#define REPS		800U
-
-static void __init
-do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
-{
-	int speed;
-	unsigned long reps;
-	ktime_t min, start, t0;
-
-	tmpl->next = template_list;
-	template_list = tmpl;
-
-	preempt_disable();
-
-	reps = 0;
-	t0 = ktime_get();
-	/* delay start until time has advanced */
-	while ((start = ktime_get()) == t0)
-		cpu_relax();
-	do {
-		mb(); /* prevent loop optimization */
-		tmpl->do_2(BENCH_SIZE, b1, b2);
-		mb();
-	} while (reps++ < REPS || (t0 = ktime_get()) == start);
-	min = ktime_sub(t0, start);
-
-	preempt_enable();
-
-	// bytes/ns == GB/s, multiply by 1000 to get MB/s [not MiB/s]
-	speed = (1000 * reps * BENCH_SIZE) / (unsigned int)ktime_to_ns(min);
-	tmpl->speed = speed;
-
-	pr_info("   %-16s: %5d MB/sec\n", tmpl->name, speed);
-}
-
-static int __init
-calibrate_xor_blocks(void)
-{
-	void *b1, *b2;
-	struct xor_block_template *f, *fastest;
-
-	fastest = XOR_SELECT_TEMPLATE(NULL);
-
-	if (fastest) {
-		printk(KERN_INFO "xor: automatically using best "
-				 "checksumming function   %-10s\n",
-		       fastest->name);
-		goto out;
-	}
-
-	b1 = (void *) __get_free_pages(GFP_KERNEL, 2);
-	if (!b1) {
-		printk(KERN_WARNING "xor: Yikes!  No memory available.\n");
-		return -ENOMEM;
-	}
-	b2 = b1 + 2*PAGE_SIZE + BENCH_SIZE;
-
-	/*
-	 * If this arch/cpu has a short-circuited selection, don't loop through
-	 * all the possible functions, just test the best one
-	 */
-
-#define xor_speed(templ)	do_xor_speed((templ), b1, b2)
-
-	printk(KERN_INFO "xor: measuring software checksum speed\n");
-	template_list = NULL;
-	XOR_TRY_TEMPLATES;
-	fastest = template_list;
-	for (f = fastest; f; f = f->next)
-		if (f->speed > fastest->speed)
-			fastest = f;
-
-	pr_info("xor: using function: %s (%d MB/sec)\n",
-	       fastest->name, fastest->speed);
-
-#undef xor_speed
-
-	free_pages((unsigned long)b1, 2);
-out:
-	active_template = fastest;
-	return 0;
-}
-
-static __exit void xor_exit(void) { }
-
-MODULE_DESCRIPTION("RAID-5 checksumming functions");
-MODULE_LICENSE("GPL");
-
-#ifndef MODULE
-/* when built-in xor.o must initialize before drivers/md/md.o */
-core_initcall(register_xor_blocks);
-#endif
-
-module_init(calibrate_xor_blocks);
-module_exit(xor_exit);