kernel/git/stable/linux.git/lib/raid6/vpermxor.uc, branch master

raid6: move to lib/raid/

2026-05-29T04:24:53+00:00

Move the raid6 code to live in lib/raid/ with the XOR code, and change the internal organization so that each architecture has a subdirectory similar to the CRC, crypto and XOR libraries, and fix up the Makefile to only build files actually needed. Also move the kunit test case from the history test/ subdirectory to tests/ and use the normal naming scheme for it. Link: https://lore.kernel.org/20260518051804.462141-4-hch@lst.de Signed-off-by: Christoph Hellwig Acked-by: Ard Biesheuvel Tested-by: Ard Biesheuvel # kunit only on arm64 Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Arnd Bergmann Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: Chris Mason Cc: Christian Borntraeger Cc: Dan Williams Cc: David Sterba Cc: Heiko Carstens Cc: Herbert Xu Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Ingo Molnar Cc: Li Nan Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Song Liu Cc: Sven Schnelle Cc: Vasily Gorbik Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton

raid6: remove KERNEL ifdefs

2026-05-29T04:24:52+00:00

With the test code ported to kernel space, none of this is required. Link: https://lore.kernel.org/20260518051804.462141-3-hch@lst.de Signed-off-by: Christoph Hellwig Acked-by: Ard Biesheuvel Tested-by: Ard Biesheuvel # kunit only on arm64 Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Arnd Bergmann Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: Chris Mason Cc: Christian Borntraeger Cc: Dan Williams Cc: David Sterba Cc: Heiko Carstens Cc: Herbert Xu Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Ingo Molnar Cc: Li Nan Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Song Liu Cc: Sven Schnelle Cc: Vasily Gorbik Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton

lib/raid6: Include for VPERMXOR

2022-03-08T23:20:21+00:00

On Ubuntu 21.10 (ppc64le) building raid6test with gcc (Ubuntu 11.2.0-7ubuntu2) 11.2.0 fails with the error below. gcc -I.. -I ../../../include -g -O2 \ -I../../../arch/powerpc/include -DCONFIG_ALTIVEC \ -c -o vpermxor1.o vpermxor1.c vpermxor1.c: In function ‘raid6_vpermxor1_gen_syndrome_real’: vpermxor1.c:64:29: error: expected string literal before ‘VPERMXOR’ 64 | asm(VPERMXOR(%0,%1,%2,%3):"=v"(wq0):"v"(gf_high), "v"(gf_low), "v"(wq0)); | ^~~~~~~~ make: *** [Makefile:58: vpermxor1.o] Error 1 So, include the header asm/ppc-opcode.h defining this macro also when not building the Linux kernel but only this too. Cc: Matt Brown Signed-off-by: Paul Menzel Signed-off-by: Song Liu

lib/raid6/altivec: Add vpermxor implementation for raid6 Q syndrome

2018-03-20T05:47:25+00:00

This patch uses the vpermxor instruction to optimise the raid6 Q syndrome. This instruction was made available with POWER8, ISA version 2.07. It allows for both vperm and vxor instructions to be done in a single instruction. This has been tested for correctness on a ppc64le vm with a basic RAID6 setup containing 5 drives. The performance benchmarks are from the raid6test in the /lib/raid6/test directory. These results are from an IBM Firestone machine with ppc64le architecture. The benchmark results show a 35% speed increase over the best existing algorithm for powerpc (altivec). The raid6test has also been run on a big-endian ppc64 vm to ensure it also works for big-endian architectures. Performance benchmarks: raid6: altivecx4 gen() 18773 MB/s raid6: altivecx8 gen() 19438 MB/s raid6: vpermxor4 gen() 25112 MB/s raid6: vpermxor8 gen() 26279 MB/s Signed-off-by: Matt Brown Reviewed-by: Daniel Axtens [mpe: Add VPERMXOR macro so we can build with old binutils] Signed-off-by: Michael Ellerman

kernel/git/stable/linux.git/lib/raid6/vpermxor.uc, branch master

raid6: move to lib/raid/

raid6: remove __KERNEL__ ifdefs

lib/raid6: Include for VPERMXOR

lib/raid6/altivec: Add vpermxor implementation for raid6 Q syndrome

raid6: remove KERNEL ifdefs