[PW_SID:1082432] arch/riscv: Add bitrev.h file to support rev8 and brev8 by linux-riscv-bot · Pull Request #1787 · linux-riscv/linux

linux-riscv-bot · 2026-04-17T10:00:00Z

PR for series 1082432 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=1082432
Version: 3

Define generic __bitrev8/16/32 using the implementation in <linux/bitrev.h>, so they can be reused in <asm/bitrev.h>, such as RISCV. Reviewed-by: Yury Norov <ynorov@nvidia.com> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

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. Link: https://docs.riscv.org/reference/isa/unpriv/b-st-ext.html Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot · 2026-04-17T10:06:24Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 136.52 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T10:28:11Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1304.82 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T10:59:51Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1898.07 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:00:17Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 24.66 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:00:44Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 25.63 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:00:48Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 2.31 seconds
Result: WARNING
Output:

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#21: 
new file mode 100644

total: 0 errors, 1 warnings, 0 checks, 56 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 d1927db1d60d ("bitops: Define generic __bitrev8/16/32 for reuse") 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, 0 checks, 56 lines checked
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?

linux-riscv-bot · 2026-04-17T11:02:13Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 83.04 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:02:15Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.25 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:02:17Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
kdoc
Desc: Detects for kdoc errors
Duration: 0.83 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:02:19Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
module-param
Desc: Detect module_param changes
Duration: 0.26 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:02:21Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:02:23Z

Patch 1: "[v3,1/2] bitops: Define generic __bitrev8/16/32 for reuse"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.31 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:04:54Z

Patch 2: "[v3,2/2] arch/riscv: Add bitrev.h file to support rev8 and brev8"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 135.27 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:27:05Z

Patch 2: "[v3,2/2] 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: 1330.17 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:59:02Z

Patch 2: "[v3,2/2] 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: 1915.11 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:59:28Z

Patch 2: "[v3,2/2] 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: 24.66 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T11:59:56Z

Patch 2: "[v3,2/2] 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: 26.38 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T12:00:00Z

Patch 2: "[v3,2/2] arch/riscv: Add bitrev.h file to support rev8 and brev8"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 2.05 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 '('
#64: FILE: arch/riscv/include/asm/bitrev.h:17:
+	asm volatile(

CHECK: Lines should not end with a '('
#92: FILE: arch/riscv/include/asm/bitrev.h:45:
+	asm volatile(

total: 0 errors, 1 warnings, 2 checks, 62 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 2be036ba1207 ("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, 2 checks, 62 lines checked
CHECK: Lines should not end with a '('
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?

linux-riscv-bot · 2026-04-17T12:01:25Z

Patch 2: "[v3,2/2] arch/riscv: Add bitrev.h file to support rev8 and brev8"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 84.21 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T12:01:27Z

Patch 2: "[v3,2/2] 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

linux-riscv-bot · 2026-04-17T12:01:30Z

Patch 2: "[v3,2/2] arch/riscv: Add bitrev.h file to support rev8 and brev8"
kdoc
Desc: Detects for kdoc errors
Duration: 0.91 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T12:01:32Z

Patch 2: "[v3,2/2] arch/riscv: Add bitrev.h file to support rev8 and brev8"
module-param
Desc: Detect module_param changes
Duration: 0.26 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T12:01:33Z

Patch 2: "[v3,2/2] arch/riscv: Add bitrev.h file to support rev8 and brev8"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-04-17T12:01:35Z

Patch 2: "[v3,2/2] 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

ruanjinjie-eng added 2 commits April 17, 2026 09:59

linux-riscv-bot closed this Apr 20, 2026

linux-riscv-bot deleted the pw1082432 branch April 20, 2026 14:38

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