kernel/git/stable/linux.git/lib/raid/xor, branch master

xor/kunit: add a benchmark

2026-08-04T04:10:15+00:00

Add a benchmark to test the XOR functions for more representative block sizes and numbers of disks. Including 64k would be useful here, but increasing the test buffer size increases the runtime of the functional kunit test too much unfortunately. 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/20260715144825.95432-5-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Eric Biggers Signed-off-by: Andrew Morton

xor/kunit: fix a spelling error

2026-08-04T04:10:15+00:00

Link: https://lore.kernel.org/20260715144825.95432-4-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Eric Biggers Signed-off-by: Andrew Morton

xor: improve the runtime selection benchmark

2026-08-04T04:10:15+00:00

Use plain ktime_get_ns for the timing, use 4 + 1 disks for a realistic load, and report the throughput on the data disks instead of the that on the parity disk, which isn't all that useful. Link: https://lore.kernel.org/20260715144825.95432-3-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Eric Biggers Signed-off-by: Andrew Morton

xor: enable lock context analysis

2026-08-04T04:10:15+00:00

Patch series "misc lib/raid/ improvements v2". This series improves the benchmark-based algorithm selection and adds kunit benchmarks for both the XOR and raid6 libraries, and tidies up a few very minor other bits. This patch (of 8): The code doesn't have any locking, so this is trivial. Link: https://lore.kernel.org/20260715144825.95432-1-hch@lst.de Link: https://lore.kernel.org/20260715144825.95432-2-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Eric Biggers Signed-off-by: Andrew Morton

Merge tag 'mm-nonmm-stable-2026-06-21-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-06-21T20:20:19+00:00

Pull non-MM updates from Andrew Morton: - "taskstats: fix TGID dead-thread stat retention" (Yiyang Chen) Fix a taskstats TGID aggregation bug where fields added in the TGID query path were not preserved after thread exit, and adds a kselftest covering the regression. - "lib/tests: string_helpers: Slight improvements" (Andy Shevchenko) Improve lib/tests/string_helpers_kunit.c a little - "lib/base64: decode fixes" (Josh Law) Address minor issues in lib/base64.c - "selftests/filelock: Make output more kselftestish" (Mark Brown) Make the output from the ofdlocks test a bit easier for tooling to work with. Also ignore the generated file - "uaccess: unify inline vs outline copy_{from,to}_user() selection" (Yury Norov) Simplify the usercopy code by removing the selectability of inlining copy_{from,to}_user(). - "ocfs2: validate inline xattr header consumers" (ZhengYuan Huang) Fix a number of possible issues in the ocfs2 xattr code - "lib and lib/cmdline enhancements" (Dmitry Antipov) Provide additional robustness checking in the cmdline handling code and its in-kernel testing and selftests - "cleanup the RAID6 P/Q library" (Christoph Hellwig) Clean up the RAID6 P/Q library to match the recent updates to the RAID 5 XOR library and other CRC/crypto libraries - "ocfs2: harden inode validators against forged metadata" (Michael Bommarito) Add three structural checks to OCFS2 dinode validation so malformed on-disk fields are rejected before ocfs2_populate_inode() copies them into the in-core inode - "lib/raid: replace __get_free_pages() call with kmalloc()" (Mike Rapoport) Clean up the lib/raid code by using kmalloc() in more places * tag 'mm-nonmm-stable-2026-06-21-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (108 commits) ocfs2: fix circular locking dependency in ocfs2_dio_end_io_write ocfs2: fix NULL h_transaction deref in ocfs2_assure_trans_credits lib: interval_tree_test: validate benchmark parameters ocfs2: avoid moving extents to occupied clusters treewide: fix transposed "sign" typos and update spelling.txt ocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec fat: reject BPB volumes whose data area starts beyond total sectors selftests/uevent: increase __UEVENT_BUFFER_SIZE to avoid ENOBUFS on busy systems lib/test_firmware: allocate the configured into_buf size fs: efs: remove unneeded debug prints checkpatch: cuppress warnings when Reported-by: is followed by Link: MAINTAINERS: add Alexander as a kcov reviewer mailmap: update Alexander Sverdlin's Email addresses fs: fat: inode: replace sprintf() with scnprintf() ocfs2: fix out-of-bounds write in ocfs2_remove_refcount_extent ocfs2: fix race between ocfs2_control_install_private() and ocfs2_control_release() ocfs2/dlm: require a ref for locking_state debugfs open ocfs2: reject FITRIM ranges shorter than a cluster ocfs2: validate fast symlink target during inode read ocfs2: add journal NULL check in ocfs2_checkpoint_inode() ...

xor: use kmalloc() in calibrate_xor_blocks()

2026-06-04T21:49:27+00:00

Patch series "lib/raid: replace __get_free_pages() call with kmalloc()", v4. The xor benchmark allocates 4 pages for a scratch buffer that is used purely as a CPU-only XOR working area. 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(). This patch (of 2): The xor benchmark allocates 4 pages for a scratch buffer that is used purely as a CPU-only XOR working area. 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/20260528-lib-v4-0-4e3ad1277279@kernel.org Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com Link: https://lore.kernel.org/20260528-lib-v4-1-4e3ad1277279@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Cc: Christoph Hellwig Cc: Li Nan Cc: Song Liu Signed-off-by: Andrew Morton

xor/arm64: Use shared NEON intrinsics implementation from 32-bit ARM

2026-05-28T20:14:21+00:00

Tweak the arm64 code so that the pure NEON intrinsics implementation of XOR is shared between arm64 and ARM. While at it, rename the arm64 specific piece xor-eor3.c to reflect that only the version based on the EOR3 instruction is kept there. Signed-off-by: Ard Biesheuvel Link: https://patch.msgid.link/20260422171655.3437334-13-ardb+git@google.com Signed-off-by: Eric Biggers

xor/arm: Replace vectorized implementation with arm64's intrinsics

2026-05-28T20:14:19+00:00

Drop the XOR implementation generated by the vectorizer: this has always been a bit of a hack, and now that arm64 has an intrinsics version that works on ARM too, let's use that instead. So copy the part of the arm64 code that can be shared (so not the EOR3 version). The arm64 code will be updated in a subsequent patch to share this implementation. Performance (QEMU mach-virt VM running on Synquacer [Cortex-A53 @ 1 GHz] Before: [ 3.519687] xor: measuring software checksum speed [ 3.521725] neon : 1660 MB/sec [ 3.524733] 32regs : 1105 MB/sec [ 3.527751] 8regs : 1098 MB/sec [ 3.529911] arm4regs : 1540 MB/sec After: [ 3.517654] xor: measuring software checksum speed [ 3.519454] neon : 1896 MB/sec [ 3.522499] 32regs : 1090 MB/sec [ 3.525560] 8regs : 1083 MB/sec [ 3.527700] arm4regs : 1556 MB/sec Signed-off-by: Ard Biesheuvel Acked-by: Christoph Hellwig Link: https://patch.msgid.link/20260422171655.3437334-12-ardb+git@google.com Signed-off-by: Eric Biggers

xor: add a kunit test case

2026-04-03T06:36:22+00:00

Add a test case for the XOR routines loosely based on the CRC kunit test. Link: https://lkml.kernel.org/r/20260327061704.3707577-29-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Eric Biggers Tested-by: Eric Biggers Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Andreas Larsson Cc: Anton Ivanov Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: Chris Mason Cc: Christian Borntraeger Cc: Dan Williams Cc: David S. Miller Cc: David Sterba Cc: Heiko Carstens Cc: Herbert Xu Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Ingo Molnar Cc: Jason A. Donenfeld Cc: Johannes Berg Cc: Li Nan Cc: Madhavan Srinivasan Cc: Magnus Lindholm Cc: Matt Turner Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Richard Henderson Cc: Richard Weinberger Cc: Russell King Cc: Song Liu Cc: Sven Schnelle Cc: Ted Ts'o Cc: Vasily Gorbik Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton

xor: use static_call for xor_gen

2026-04-03T06:36:21+00:00

Avoid the indirect call for xor_generation by using a static_call. Link: https://lkml.kernel.org/r/20260327061704.3707577-28-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Eric Biggers Tested-by: Eric Biggers Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Andreas Larsson Cc: Anton Ivanov Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: Chris Mason Cc: Christian Borntraeger Cc: Dan Williams Cc: David S. Miller Cc: David Sterba Cc: Heiko Carstens Cc: Herbert Xu Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Ingo Molnar Cc: Jason A. Donenfeld Cc: Johannes Berg Cc: Li Nan Cc: Madhavan Srinivasan Cc: Magnus Lindholm Cc: Matt Turner Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Richard Henderson Cc: Richard Weinberger Cc: Russell King Cc: Song Liu Cc: Sven Schnelle Cc: Ted Ts'o Cc: Vasily Gorbik Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton