From: Eric Biggers <ebiggers@kernel.org>
To: linux-raid@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>
Cc: linux-crypto@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Eric Biggers <ebiggers@kernel.org>
Subject: [PATCH 1/3] xor: remove obsolete MMX optimized code
Date: Sun, 25 Oct 2026 12:12:05 -0700 [thread overview]
Message-ID: <20261025191207.86590-2-ebiggers@kernel.org> (raw)
In-Reply-To: <20261025191207.86590-1-ebiggers@kernel.org>
The MMX optimized XOR code is used only on 25-year old 32-bit CPUs that
lack SSE support -- and only on systems that actually have a RAID array.
Those CPUs already have well-tested scalar C fallbacks.
Together with the RAID6 code, it's also the only remaining MMX optimized
code in the kernel. MMX optimizations for the much more commonly called
functions memcpy(), copy_page(), and clear_page() were already removed
years ago by commit c6dbd3e5e69c ("x86/mmx_32: Remove X86_USE_3DNOW").
Remove the MMX optimized XOR code.
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
---
lib/raid/xor/Makefile | 2 +-
lib/raid/xor/x86/xor-mmx.c | 515 ------------------------------------
lib/raid/xor/x86/xor_arch.h | 5 -
3 files changed, 1 insertion(+), 521 deletions(-)
delete mode 100644 lib/raid/xor/x86/xor-mmx.c
diff --git a/lib/raid/xor/Makefile b/lib/raid/xor/Makefile
index e1e3455c219de..0b6ddacf442c3 100644
--- a/lib/raid/xor/Makefile
+++ b/lib/raid/xor/Makefile
@@ -30,7 +30,7 @@ xor-$(CONFIG_RISCV_ISA_V) += riscv/xor.o riscv/xor-glue.o
xor-$(CONFIG_SPARC32) += sparc/xor-sparc32.o
xor-$(CONFIG_SPARC64) += sparc/xor-sparc64.o sparc/xor-sparc64-glue.o
xor-$(CONFIG_S390) += s390/xor.o
-xor-$(CONFIG_X86_32) += x86/xor-avx.o x86/xor-sse.o x86/xor-mmx.o
+xor-$(CONFIG_X86_32) += x86/xor-avx.o x86/xor-sse.o
xor-$(CONFIG_X86_64) += x86/xor-avx.o x86/xor-sse.o x86/xor-avx512.o
obj-y += tests/
diff --git a/lib/raid/xor/x86/xor-mmx.c b/lib/raid/xor/x86/xor-mmx.c
deleted file mode 100644
index 63a8b0444fcef..0000000000000
--- a/lib/raid/xor/x86/xor-mmx.c
+++ /dev/null
@@ -1,515 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Optimized XOR parity functions for MMX.
- *
- * Copyright (C) 1998 Ingo Molnar.
- */
-#include <asm/fpu/api.h>
-#include "xor_impl.h"
-#include "xor_arch.h"
-
-#define LD(x, y) " movq 8*("#x")(%1), %%mm"#y" ;\n"
-#define ST(x, y) " movq %%mm"#y", 8*("#x")(%1) ;\n"
-#define XO1(x, y) " pxor 8*("#x")(%2), %%mm"#y" ;\n"
-#define XO2(x, y) " pxor 8*("#x")(%3), %%mm"#y" ;\n"
-#define XO3(x, y) " pxor 8*("#x")(%4), %%mm"#y" ;\n"
-#define XO4(x, y) " pxor 8*("#x")(%5), %%mm"#y" ;\n"
-
-static void
-xor_pII_mmx_2(unsigned long bytes, unsigned long * __restrict p1,
- const unsigned long * __restrict p2)
-{
- unsigned long lines = bytes >> 7;
-
- asm volatile(
-#undef BLOCK
-#define BLOCK(i) \
- LD(i, 0) \
- LD(i + 1, 1) \
- LD(i + 2, 2) \
- LD(i + 3, 3) \
- XO1(i, 0) \
- ST(i, 0) \
- XO1(i+1, 1) \
- ST(i+1, 1) \
- XO1(i + 2, 2) \
- ST(i + 2, 2) \
- XO1(i + 3, 3) \
- ST(i + 3, 3)
-
- " .align 32 ;\n"
- " 1: ;\n"
-
- BLOCK(0)
- BLOCK(4)
- BLOCK(8)
- BLOCK(12)
-
- " addl $128, %1 ;\n"
- " addl $128, %2 ;\n"
- " decl %0 ;\n"
- " jnz 1b ;\n"
- : "+r" (lines),
- "+r" (p1), "+r" (p2)
- :
- : "memory");
-}
-
-static void
-xor_pII_mmx_3(unsigned long bytes, unsigned long * __restrict p1,
- const unsigned long * __restrict p2,
- const unsigned long * __restrict p3)
-{
- unsigned long lines = bytes >> 7;
-
- asm volatile(
-#undef BLOCK
-#define BLOCK(i) \
- LD(i, 0) \
- LD(i + 1, 1) \
- LD(i + 2, 2) \
- LD(i + 3, 3) \
- XO1(i, 0) \
- XO1(i + 1, 1) \
- XO1(i + 2, 2) \
- XO1(i + 3, 3) \
- XO2(i, 0) \
- ST(i, 0) \
- XO2(i + 1, 1) \
- ST(i + 1, 1) \
- XO2(i + 2, 2) \
- ST(i + 2, 2) \
- XO2(i + 3, 3) \
- ST(i + 3, 3)
-
- " .align 32 ;\n"
- " 1: ;\n"
-
- BLOCK(0)
- BLOCK(4)
- BLOCK(8)
- BLOCK(12)
-
- " addl $128, %1 ;\n"
- " addl $128, %2 ;\n"
- " addl $128, %3 ;\n"
- " decl %0 ;\n"
- " jnz 1b ;\n"
- : "+r" (lines),
- "+r" (p1), "+r" (p2), "+r" (p3)
- :
- : "memory");
-}
-
-static void
-xor_pII_mmx_4(unsigned long bytes, unsigned long * __restrict p1,
- const unsigned long * __restrict p2,
- const unsigned long * __restrict p3,
- const unsigned long * __restrict p4)
-{
- unsigned long lines = bytes >> 7;
-
- asm volatile(
-#undef BLOCK
-#define BLOCK(i) \
- LD(i, 0) \
- LD(i + 1, 1) \
- LD(i + 2, 2) \
- LD(i + 3, 3) \
- XO1(i, 0) \
- XO1(i + 1, 1) \
- XO1(i + 2, 2) \
- XO1(i + 3, 3) \
- XO2(i, 0) \
- XO2(i + 1, 1) \
- XO2(i + 2, 2) \
- XO2(i + 3, 3) \
- XO3(i, 0) \
- ST(i, 0) \
- XO3(i + 1, 1) \
- ST(i + 1, 1) \
- XO3(i + 2, 2) \
- ST(i + 2, 2) \
- XO3(i + 3, 3) \
- ST(i + 3, 3)
-
- " .align 32 ;\n"
- " 1: ;\n"
-
- BLOCK(0)
- BLOCK(4)
- BLOCK(8)
- BLOCK(12)
-
- " addl $128, %1 ;\n"
- " addl $128, %2 ;\n"
- " addl $128, %3 ;\n"
- " addl $128, %4 ;\n"
- " decl %0 ;\n"
- " jnz 1b ;\n"
- : "+r" (lines),
- "+r" (p1), "+r" (p2), "+r" (p3), "+r" (p4)
- :
- : "memory");
-}
-
-
-static void
-xor_pII_mmx_5(unsigned long bytes, unsigned long * __restrict p1,
- const unsigned long * __restrict p2,
- const unsigned long * __restrict p3,
- const unsigned long * __restrict p4,
- const unsigned long * __restrict p5)
-{
- unsigned long lines = bytes >> 7;
-
- /* Make sure GCC forgets anything it knows about p4 or p5,
- such that it won't pass to the asm volatile below a
- register that is shared with any other variable. That's
- because we modify p4 and p5 there, but we can't mark them
- as read/write, otherwise we'd overflow the 10-asm-operands
- limit of GCC < 3.1. */
- asm("" : "+r" (p4), "+r" (p5));
-
- asm volatile(
-#undef BLOCK
-#define BLOCK(i) \
- LD(i, 0) \
- LD(i + 1, 1) \
- LD(i + 2, 2) \
- LD(i + 3, 3) \
- XO1(i, 0) \
- XO1(i + 1, 1) \
- XO1(i + 2, 2) \
- XO1(i + 3, 3) \
- XO2(i, 0) \
- XO2(i + 1, 1) \
- XO2(i + 2, 2) \
- XO2(i + 3, 3) \
- XO3(i, 0) \
- XO3(i + 1, 1) \
- XO3(i + 2, 2) \
- XO3(i + 3, 3) \
- XO4(i, 0) \
- ST(i, 0) \
- XO4(i + 1, 1) \
- ST(i + 1, 1) \
- XO4(i + 2, 2) \
- ST(i + 2, 2) \
- XO4(i + 3, 3) \
- ST(i + 3, 3)
-
- " .align 32 ;\n"
- " 1: ;\n"
-
- BLOCK(0)
- BLOCK(4)
- BLOCK(8)
- BLOCK(12)
-
- " addl $128, %1 ;\n"
- " addl $128, %2 ;\n"
- " addl $128, %3 ;\n"
- " addl $128, %4 ;\n"
- " addl $128, %5 ;\n"
- " decl %0 ;\n"
- " jnz 1b ;\n"
- : "+r" (lines),
- "+r" (p1), "+r" (p2), "+r" (p3)
- : "r" (p4), "r" (p5)
- : "memory");
-
- /* p4 and p5 were modified, and now the variables are dead.
- Clobber them just to be sure nobody does something stupid
- like assuming they have some legal value. */
- asm("" : "=r" (p4), "=r" (p5));
-}
-
-#undef LD
-#undef XO1
-#undef XO2
-#undef XO3
-#undef XO4
-#undef ST
-#undef BLOCK
-
-static void
-xor_p5_mmx_2(unsigned long bytes, unsigned long * __restrict p1,
- const unsigned long * __restrict p2)
-{
- unsigned long lines = bytes >> 6;
-
- asm volatile(
- " .align 32 ;\n"
- " 1: ;\n"
- " movq (%1), %%mm0 ;\n"
- " movq 8(%1), %%mm1 ;\n"
- " pxor (%2), %%mm0 ;\n"
- " movq 16(%1), %%mm2 ;\n"
- " movq %%mm0, (%1) ;\n"
- " pxor 8(%2), %%mm1 ;\n"
- " movq 24(%1), %%mm3 ;\n"
- " movq %%mm1, 8(%1) ;\n"
- " pxor 16(%2), %%mm2 ;\n"
- " movq 32(%1), %%mm4 ;\n"
- " movq %%mm2, 16(%1) ;\n"
- " pxor 24(%2), %%mm3 ;\n"
- " movq 40(%1), %%mm5 ;\n"
- " movq %%mm3, 24(%1) ;\n"
- " pxor 32(%2), %%mm4 ;\n"
- " movq 48(%1), %%mm6 ;\n"
- " movq %%mm4, 32(%1) ;\n"
- " pxor 40(%2), %%mm5 ;\n"
- " movq 56(%1), %%mm7 ;\n"
- " movq %%mm5, 40(%1) ;\n"
- " pxor 48(%2), %%mm6 ;\n"
- " pxor 56(%2), %%mm7 ;\n"
- " movq %%mm6, 48(%1) ;\n"
- " movq %%mm7, 56(%1) ;\n"
-
- " addl $64, %1 ;\n"
- " addl $64, %2 ;\n"
- " decl %0 ;\n"
- " jnz 1b ;\n"
- : "+r" (lines),
- "+r" (p1), "+r" (p2)
- :
- : "memory");
-}
-
-static void
-xor_p5_mmx_3(unsigned long bytes, unsigned long * __restrict p1,
- const unsigned long * __restrict p2,
- const unsigned long * __restrict p3)
-{
- unsigned long lines = bytes >> 6;
-
- asm volatile(
- " .align 32,0x90 ;\n"
- " 1: ;\n"
- " movq (%1), %%mm0 ;\n"
- " movq 8(%1), %%mm1 ;\n"
- " pxor (%2), %%mm0 ;\n"
- " movq 16(%1), %%mm2 ;\n"
- " pxor 8(%2), %%mm1 ;\n"
- " pxor (%3), %%mm0 ;\n"
- " pxor 16(%2), %%mm2 ;\n"
- " movq %%mm0, (%1) ;\n"
- " pxor 8(%3), %%mm1 ;\n"
- " pxor 16(%3), %%mm2 ;\n"
- " movq 24(%1), %%mm3 ;\n"
- " movq %%mm1, 8(%1) ;\n"
- " movq 32(%1), %%mm4 ;\n"
- " movq 40(%1), %%mm5 ;\n"
- " pxor 24(%2), %%mm3 ;\n"
- " movq %%mm2, 16(%1) ;\n"
- " pxor 32(%2), %%mm4 ;\n"
- " pxor 24(%3), %%mm3 ;\n"
- " pxor 40(%2), %%mm5 ;\n"
- " movq %%mm3, 24(%1) ;\n"
- " pxor 32(%3), %%mm4 ;\n"
- " pxor 40(%3), %%mm5 ;\n"
- " movq 48(%1), %%mm6 ;\n"
- " movq %%mm4, 32(%1) ;\n"
- " movq 56(%1), %%mm7 ;\n"
- " pxor 48(%2), %%mm6 ;\n"
- " movq %%mm5, 40(%1) ;\n"
- " pxor 56(%2), %%mm7 ;\n"
- " pxor 48(%3), %%mm6 ;\n"
- " pxor 56(%3), %%mm7 ;\n"
- " movq %%mm6, 48(%1) ;\n"
- " movq %%mm7, 56(%1) ;\n"
-
- " addl $64, %1 ;\n"
- " addl $64, %2 ;\n"
- " addl $64, %3 ;\n"
- " decl %0 ;\n"
- " jnz 1b ;\n"
- : "+r" (lines),
- "+r" (p1), "+r" (p2), "+r" (p3)
- :
- : "memory" );
-}
-
-static void
-xor_p5_mmx_4(unsigned long bytes, unsigned long * __restrict p1,
- const unsigned long * __restrict p2,
- const unsigned long * __restrict p3,
- const unsigned long * __restrict p4)
-{
- unsigned long lines = bytes >> 6;
-
- asm volatile(
- " .align 32,0x90 ;\n"
- " 1: ;\n"
- " movq (%1), %%mm0 ;\n"
- " movq 8(%1), %%mm1 ;\n"
- " pxor (%2), %%mm0 ;\n"
- " movq 16(%1), %%mm2 ;\n"
- " pxor 8(%2), %%mm1 ;\n"
- " pxor (%3), %%mm0 ;\n"
- " pxor 16(%2), %%mm2 ;\n"
- " pxor 8(%3), %%mm1 ;\n"
- " pxor (%4), %%mm0 ;\n"
- " movq 24(%1), %%mm3 ;\n"
- " pxor 16(%3), %%mm2 ;\n"
- " pxor 8(%4), %%mm1 ;\n"
- " movq %%mm0, (%1) ;\n"
- " movq 32(%1), %%mm4 ;\n"
- " pxor 24(%2), %%mm3 ;\n"
- " pxor 16(%4), %%mm2 ;\n"
- " movq %%mm1, 8(%1) ;\n"
- " movq 40(%1), %%mm5 ;\n"
- " pxor 32(%2), %%mm4 ;\n"
- " pxor 24(%3), %%mm3 ;\n"
- " movq %%mm2, 16(%1) ;\n"
- " pxor 40(%2), %%mm5 ;\n"
- " pxor 32(%3), %%mm4 ;\n"
- " pxor 24(%4), %%mm3 ;\n"
- " movq %%mm3, 24(%1) ;\n"
- " movq 56(%1), %%mm7 ;\n"
- " movq 48(%1), %%mm6 ;\n"
- " pxor 40(%3), %%mm5 ;\n"
- " pxor 32(%4), %%mm4 ;\n"
- " pxor 48(%2), %%mm6 ;\n"
- " movq %%mm4, 32(%1) ;\n"
- " pxor 56(%2), %%mm7 ;\n"
- " pxor 40(%4), %%mm5 ;\n"
- " pxor 48(%3), %%mm6 ;\n"
- " pxor 56(%3), %%mm7 ;\n"
- " movq %%mm5, 40(%1) ;\n"
- " pxor 48(%4), %%mm6 ;\n"
- " pxor 56(%4), %%mm7 ;\n"
- " movq %%mm6, 48(%1) ;\n"
- " movq %%mm7, 56(%1) ;\n"
-
- " addl $64, %1 ;\n"
- " addl $64, %2 ;\n"
- " addl $64, %3 ;\n"
- " addl $64, %4 ;\n"
- " decl %0 ;\n"
- " jnz 1b ;\n"
- : "+r" (lines),
- "+r" (p1), "+r" (p2), "+r" (p3), "+r" (p4)
- :
- : "memory");
-}
-
-static void
-xor_p5_mmx_5(unsigned long bytes, unsigned long * __restrict p1,
- const unsigned long * __restrict p2,
- const unsigned long * __restrict p3,
- const unsigned long * __restrict p4,
- const unsigned long * __restrict p5)
-{
- unsigned long lines = bytes >> 6;
-
- /* Make sure GCC forgets anything it knows about p4 or p5,
- such that it won't pass to the asm volatile below a
- register that is shared with any other variable. That's
- because we modify p4 and p5 there, but we can't mark them
- as read/write, otherwise we'd overflow the 10-asm-operands
- limit of GCC < 3.1. */
- asm("" : "+r" (p4), "+r" (p5));
-
- asm volatile(
- " .align 32,0x90 ;\n"
- " 1: ;\n"
- " movq (%1), %%mm0 ;\n"
- " movq 8(%1), %%mm1 ;\n"
- " pxor (%2), %%mm0 ;\n"
- " pxor 8(%2), %%mm1 ;\n"
- " movq 16(%1), %%mm2 ;\n"
- " pxor (%3), %%mm0 ;\n"
- " pxor 8(%3), %%mm1 ;\n"
- " pxor 16(%2), %%mm2 ;\n"
- " pxor (%4), %%mm0 ;\n"
- " pxor 8(%4), %%mm1 ;\n"
- " pxor 16(%3), %%mm2 ;\n"
- " movq 24(%1), %%mm3 ;\n"
- " pxor (%5), %%mm0 ;\n"
- " pxor 8(%5), %%mm1 ;\n"
- " movq %%mm0, (%1) ;\n"
- " pxor 16(%4), %%mm2 ;\n"
- " pxor 24(%2), %%mm3 ;\n"
- " movq %%mm1, 8(%1) ;\n"
- " pxor 16(%5), %%mm2 ;\n"
- " pxor 24(%3), %%mm3 ;\n"
- " movq 32(%1), %%mm4 ;\n"
- " movq %%mm2, 16(%1) ;\n"
- " pxor 24(%4), %%mm3 ;\n"
- " pxor 32(%2), %%mm4 ;\n"
- " movq 40(%1), %%mm5 ;\n"
- " pxor 24(%5), %%mm3 ;\n"
- " pxor 32(%3), %%mm4 ;\n"
- " pxor 40(%2), %%mm5 ;\n"
- " movq %%mm3, 24(%1) ;\n"
- " pxor 32(%4), %%mm4 ;\n"
- " pxor 40(%3), %%mm5 ;\n"
- " movq 48(%1), %%mm6 ;\n"
- " movq 56(%1), %%mm7 ;\n"
- " pxor 32(%5), %%mm4 ;\n"
- " pxor 40(%4), %%mm5 ;\n"
- " pxor 48(%2), %%mm6 ;\n"
- " pxor 56(%2), %%mm7 ;\n"
- " movq %%mm4, 32(%1) ;\n"
- " pxor 48(%3), %%mm6 ;\n"
- " pxor 56(%3), %%mm7 ;\n"
- " pxor 40(%5), %%mm5 ;\n"
- " pxor 48(%4), %%mm6 ;\n"
- " pxor 56(%4), %%mm7 ;\n"
- " movq %%mm5, 40(%1) ;\n"
- " pxor 48(%5), %%mm6 ;\n"
- " pxor 56(%5), %%mm7 ;\n"
- " movq %%mm6, 48(%1) ;\n"
- " movq %%mm7, 56(%1) ;\n"
-
- " addl $64, %1 ;\n"
- " addl $64, %2 ;\n"
- " addl $64, %3 ;\n"
- " addl $64, %4 ;\n"
- " addl $64, %5 ;\n"
- " decl %0 ;\n"
- " jnz 1b ;\n"
- : "+r" (lines),
- "+r" (p1), "+r" (p2), "+r" (p3)
- : "r" (p4), "r" (p5)
- : "memory");
-
- /* p4 and p5 were modified, and now the variables are dead.
- Clobber them just to be sure nobody does something stupid
- like assuming they have some legal value. */
- asm("" : "=r" (p4), "=r" (p5));
-}
-
-DO_XOR_BLOCKS(pII_mmx_inner, xor_pII_mmx_2, xor_pII_mmx_3, xor_pII_mmx_4,
- xor_pII_mmx_5);
-
-static void xor_gen_pII_mmx(void *dest, void **srcs, unsigned int src_cnt,
- unsigned int bytes)
-{
- kernel_fpu_begin();
- xor_gen_pII_mmx_inner(dest, srcs, src_cnt, bytes);
- kernel_fpu_end();
-}
-
-struct xor_block_template xor_block_pII_mmx = {
- .name = "pII_mmx",
- .xor_gen = xor_gen_pII_mmx,
-};
-
-DO_XOR_BLOCKS(p5_mmx_inner, xor_p5_mmx_2, xor_p5_mmx_3, xor_p5_mmx_4,
- xor_p5_mmx_5);
-
-static void xor_gen_p5_mmx(void *dest, void **srcs, unsigned int src_cnt,
- unsigned int bytes)
-{
- kernel_fpu_begin();
- xor_gen_p5_mmx_inner(dest, srcs, src_cnt, bytes);
- kernel_fpu_end();
-}
-
-struct xor_block_template xor_block_p5_mmx = {
- .name = "p5_mmx",
- .xor_gen = xor_gen_p5_mmx,
-};
diff --git a/lib/raid/xor/x86/xor_arch.h b/lib/raid/xor/x86/xor_arch.h
index ed5921d2e2aad..3bc0e1650b78c 100644
--- a/lib/raid/xor/x86/xor_arch.h
+++ b/lib/raid/xor/x86/xor_arch.h
@@ -1,8 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <asm/cpufeature.h>
-extern struct xor_block_template xor_block_pII_mmx;
-extern struct xor_block_template xor_block_p5_mmx;
extern struct xor_block_template xor_block_sse;
extern struct xor_block_template xor_block_sse_pf64;
extern struct xor_block_template xor_block_avx;
@@ -33,9 +31,6 @@ static __always_inline void __init arch_xor_init(void)
*/
xor_register(&xor_block_sse);
xor_register(&xor_block_sse_pf64);
- } else if (boot_cpu_has(X86_FEATURE_MMX)) {
- xor_register(&xor_block_pII_mmx);
- xor_register(&xor_block_p5_mmx);
} else {
xor_register(&xor_block_8regs);
xor_register(&xor_block_8regs_p);
--
2.56.0
next prev parent reply other threads:[~2026-10-25 19:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-25 19:12 [PATCH 0/3] raid: " Eric Biggers
2026-10-25 19:12 ` Eric Biggers [this message]
2026-10-25 19:12 ` [PATCH 2/3] raid6: " Eric Biggers
2026-10-25 19:12 ` [PATCH 3/3] raid6: simplify CPU feature checks Eric Biggers
2026-10-26 14:57 ` David Laight
2026-10-26 18:47 ` Eric Biggers
2026-10-26 15:00 ` [PATCH 0/3] raid: remove obsolete MMX optimized code David Laight
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