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[PW_SID:1064839] arch/riscv: Add bitrev.h file to support rev8 and brev8#1591

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[PW_SID:1064839] arch/riscv: Add bitrev.h file to support rev8 and brev8#1591
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@linux-riscv-bot linux-riscv-bot commented Mar 11, 2026

PR for series 1064839 applied to workflow__riscv__fixes

Name: arch/riscv: Add bitrev.h file to support rev8 and brev8
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1064839
Version: 1

@ruanjinjie-eng
arch/riscv: Add bitrev.h file to support rev8 and brev8
08c1738 
The RISC-V Bit-manipulation Extension for Cryptography (Zbkb) provides
the 'brev8' instruction, which reverses the bits within each byte.
Combined with the 'rev8' instruction (from Zbb or Zbkb), which reverses
the byte order of a register, we can efficiently implement 16-bit,
32-bit, and (on RV64) 64-bit bit reversal.

This is significantly faster than the default software table-lookup
implementation in lib/bitrev.c, as it replaces memory accesses and
multiple arithmetic operations with just two or three hardware
instructions.

Select HAVE_ARCH_BITREVERSE and provide <asm/bitrev.h> to utilize
these instructions when the Zbkb extension is available at runtime
via the alternatives mechanism.

Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>
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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 141.18 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1317.59 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1919.86 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 27.09 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 28.03 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 2.32 seconds
Result: WARNING
Output:

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#43: 
new file mode 100644

CHECK: Lines should not end with a '('
#63: FILE: arch/riscv/include/asm/bitrev.h:16:
+		asm volatile(

total: 0 errors, 1 warnings, 1 checks, 61 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 08c17389435d ("arch/riscv: Add bitrev.h file to support rev8 and brev8") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 1 warnings, 1 checks, 61 lines checked
CHECK: Lines should not end with a '('
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 83.75 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.24 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
kdoc
Desc: Detects for kdoc errors
Duration: 0.87 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
module-param
Desc: Detect module_param changes
Duration: 0.25 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.22 seconds
Result: PASS

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linux-riscv-bot commented Mar 11, 2026

Patch 1: "arch/riscv: Add bitrev.h file to support rev8 and brev8"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.31 seconds
Result: PASS

@linux-riscv-bot linux-riscv-bot deleted the pw1064839 branch March 19, 2026 01:28
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