[PW_SID:1029612] riscv: Optimize user copy with efficient unaligned access support #1171
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Introduce an optimized path in fallback_scalar_usercopy_sum_enabled for systems that support efficient unaligned memory accesses (i.e., when CONFIG_RISCV_EFFICIENT_UNALIGNED_ACCESS is enabled). This eliminates the overhead of bit-shifting and OR-ing partial words to reconstruct misaligned values, which was previously required for handling protential alignments. Medium-sized buffers between 8 and 9*SZREG also see noticeable improvement, as the original path would fall back to byte-by-byte copying. Signed-off-by: Mao Han <[email protected]> Signed-off-by: Linux RISC-V bot <[email protected]>
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
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Patch 1: "[1/1] riscv: Optimize user copy with efficient unaligned access support" |
PR for series 1029612 applied to workflow__riscv__fixes
Name: riscv: Optimize user copy with efficient unaligned access support
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1029612
Version: 1