kernel/git/next/linux-next.git/lib/raid/raid6, branch master

raid6: add missing vzeroupper to AVX-512 code

2026-09-06T03:23:25+00:00

Since the AVX-512 optimized RAID6 code uses ZMM registers, execute vzeroupper before returning from it. This is needed to avoid degrading the performance of any later SSE code that may happen to be executed. Link: https://lore.kernel.org/20260831212316.213896-1-ebiggers@kernel.org Fixes: e0a491c12968 ("lib/raid6: Add AVX512 optimized gen_syndrome functions") Fixes: 13c520b2993c ("lib/raid6: Add AVX512 optimized recovery functions") Signed-off-by: Eric Biggers Cc: Christoph Hellwig Cc: Signed-off-by: Andrew Morton

raid6: add missing vzeroupper to AVX2 code

2026-09-06T03:23:25+00:00

Since the AVX2 optimized RAID6 code uses YMM registers, execute vzeroupper before returning from it. This is needed to avoid degrading the performance of any later SSE code that may happen to be executed. Link: https://lore.kernel.org/20260831212308.213855-1-ebiggers@kernel.org Fixes: 2c935842bdb4 ("lib/raid6: Add AVX2 optimized gen_syndrome functions") Fixes: 7056741fd9fc ("lib/raid6: Add AVX2 optimized recovery functions") Signed-off-by: Eric Biggers Cc: Christoph Hellwig Cc: Signed-off-by: Andrew Morton

raid6/kunit: add a benchmark

2026-08-04T04:10:16+00:00

Add a benchmark to test the RAID 6 P/Q functions for more representative block sizes and numbers of disks. This splits the maximum alloc size used for the benchmark from the max size for the kunit test because recovery is currently limited to a single page at a time. Hopefully this will be fixed soon. The runtime numbers are reported in GB/s as the numbers of modern implementations are basically unreadable as MB/s. This means retro-architectures could report 0, but that is an easy tradeoff. Link: https://lore.kernel.org/20260715144825.95432-9-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Eric Biggers Signed-off-by: Andrew Morton

raid6: improve the runtime selection benchmark

2026-08-04T04:10:16+00:00

Use plain ktime_get_ns for the timing, use 8 + 2 disks for a realistic load, and report the throughput on the data disks as that is what storage systems are measured on. Link: https://lore.kernel.org/20260715144825.95432-8-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Eric Biggers Signed-off-by: Andrew Morton

raid6: defer implementation selection when built-in

2026-08-04T04:10:16+00:00

Don't hold up early boot and defer the selection just like we've been doing for the RAID5 XOR code since commit 524ccdbdfb52 ("crypto: xor - defer load time benchmark to a later time"). This will also allow full use of the timing subsystem for benchmarking. Link: https://lore.kernel.org/20260715144825.95432-7-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Eric Biggers Signed-off-by: Andrew Morton

raid6: enable lock context analysis

2026-08-04T04:10:16+00:00

The code doesn't have any locking, so this is trivial. Link: https://lore.kernel.org/20260715144825.95432-6-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Eric Biggers Signed-off-by: Andrew Morton

raid6: fix raid6_recov_rvv symbol undeclared warning

2026-06-25T17:51:32+00:00

The riscv recov_rvv.c should have included pq_arch.h for the definition of raid6_recov_rvv. Add the include to fix the following sparse warning: lib/raid/raid6/riscv/recov_rvv.c:218:32: warning: symbol 'raid6_recov_rvv' was not declared. Should it be static? Signed-off-by: Ben Dooks Reviewed-by: Nam Cao Link: https://patch.msgid.link/20260622135535.481534-1-ben.dooks@codethink.co.uk Signed-off-by: Paul Walmsley

raid6: fix riscv symbol undeclared warnigns

2026-06-25T17:47:39+00:00

The riscv rvv.c file is missing the include of pq_arch.h which defines all the exported functions. Include this to remove the following sparse warnings: lib/raid/raid6/riscv/rvv.c:1225:1: warning: symbol 'raid6_rvvx1' was not declared. Should it be static? lib/raid/raid6/riscv/rvv.c:1226:1: warning: symbol 'raid6_rvvx2' was not declared. Should it be static? lib/raid/raid6/riscv/rvv.c:1227:1: warning: symbol 'raid6_rvvx4' was not declared. Should it be static? lib/raid/raid6/riscv/rvv.c:1228:1: warning: symbol 'raid6_rvvx8' was not declared. Should it be static? Signed-off-by: Ben Dooks Reviewed-by: Nam Cao Link: https://patch.msgid.link/20260622135207.480540-1-ben.dooks@codethink.co.uk Signed-off-by: Paul Walmsley

raid6: use kmalloc() in raid6_select_algo()

2026-06-04T21:49:28+00:00

raid6_select_algo() allocates 8 pages for buffer that is used as a scratch area for selection of the best algorithm. This buffer can be allocated with kmalloc() as there's nothing special about it to go directly to the page allocator. kmalloc() provides a better API than ancient __get_free_pages(). kmalloc() does not require ugly casts and kfree() does not need to know the size of the freed object. There is no performance difference because kmalloc() redirects allocations of such size to the page allocator. Replace __get_free_pages() call with kmalloc(). Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com Link: https://lore.kernel.org/20260528-lib-v4-2-4e3ad1277279@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Reviewed-by: Christoph Hellwig Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Li Nan Cc: Song Liu Signed-off-by: Andrew Morton

raid6_kunit: randomize buffer alignment

2026-05-29T04:24:56+00:00

Add code to add random alignment to the buffers to test the case where they are not page aligned, and to move the buffers to the end of the allocation so that they are next to the vmalloc guard page. This does not include the recovery buffers as the recovery requires page alignment. Link: https://lore.kernel.org/20260518051804.462141-19-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