[PW_SID:1088339] lib: rework bitreverse by linux-riscv-bot · Pull Request #1851 · linux-riscv/linux

linux-riscv-bot · 2026-04-30T21:57:17Z

PR for series 1088339 applied to workflow__riscv__fixes

Name: lib: rework bitreverse
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1088339
Version: 1

Currently, bitreverse API is either declared based on CONFIG_HAVE_ARCH_BITREVERSE, wired to arch implementation, or if the arch has no bitreverse, based on generic implementation. So, regardless of CONFIG_BITREVERSE=n, the corresponding API is always declared. If that happens, the functions become declared but not implemented, which is an error. The following patches of the series make it possible to have bitreverse API undeclared if CONFIG_BITREVERSE=n, thus spotting the problem when building the tinyconfig: $ make -skj"$(nproc)" ARCH=s390 CROSS_COMPILE=s390-linux- mrproper tinyconfig fs/select.o In file included from include/linux/crc32.h:6, from include/linux/etherdevice.h:23, from include/linux/if_vlan.h:11, from include/linux/filter.h:21, from include/net/xdp.h:10, from include/net/busy_poll.h:19, from fs/select.c:33: include/linux/etherdevice.h: In function 'eth_hw_addr_crc': include/linux/bitrev.h:16:20: error: implicit declaration of function 'generic___bitrev32' [-Wimplicit-function-declaration] 16 | #define __bitrev32 generic___bitrev32 | ^~~~~~~~~~~~~~~~~~ include/linux/bitrev.h:67:9: note: in expansion of macro '__bitrev32' 67 | __bitrev32(__x); \ | ^~~~~~~~~~ include/linux/crc32.h:107:36: note: in expansion of macro 'bitrev32' 107 | #define ether_crc(length, data) bitrev32(crc32_le(~0, data, length)) | ^~~~~~~~ include/linux/etherdevice.h:292:16: note: in expansion of macro 'ether_crc' 292 | return ether_crc(ETH_ALEN, ha->addr); | ^~~~~~~~~ make[5]: *** [scripts/Makefile.build:289: fs/select.o] Error 1 ... The current unconditionally enabled codebase doesn't use CRC32, neither bitrev functionality, and if generic___bitrev32 prototype is provided, the compilation and linkage phases are passed OK. The only header requiring the crc32 and bitreverse prototypes is include/linux/etherdevice.h. Thus, protect inclusion of corresponding headers in the etherdevice with CONFIG_CRC32, together with the only function depending on it. Reported-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Yury Norov <ynorov@nvidia.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Currently, the bit reversal lookup table is controlled by !HAVE_ARCH_BITREVERSE. This makes it difficult for architectures to provide a hardware-accelerated implementation while still falling back to the generic table for specific configurations. Introduce CONFIG_GENERIC_BITREVERSE to explicitly manage the generic lookup table implementation. By using 'def_bool !HAVE_ARCH_BITREVERSE' with a dependency on 'BITREVERSE', we ensure that: 1. The table is only compiled when needed. 2. The .config is not polluted with useless options when BITREVERSE is disabled. 3. Avoids bloating the .data section for architectures that have full hardware bit-reverse support and don't need the table. Update lib/bitrev.c to use CONFIG_GENERIC_BITREVERSE instead of checking the absence of HAVE_ARCH_BITREVERSE. This provides a cleaner interface for architectures like RISC-V that may want to selectively use the generic implementation as a fallback. Suggested-by: David Laight <David.Laight@ACULAB.COM> Suggested-by: Yury Norov <ynorov@nvidia.com> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Yury Norov <ynorov@nvidia.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

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: Yury Norov <ynorov@nvidia.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 as well as GENERIC_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 Suggested-by: David Laight <david.laight.linux@gmail.com> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Yury Norov <ynorov@nvidia.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

The file is compiled based on CONFIG_BITREVERSE=y, but everything inside is protected with CONFIG_GENERIC_BITREVERSE. Make it simpler by switching the Makefile to compile lib/bitrev.c based on the proper config. Signed-off-by: Yury Norov <ynorov@nvidia.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Arch bitrev API is covered in MAINTAINERS under the BITOPS entry, while generic bitrev is unmaintained. Move it under BITOPS too. Signed-off-by: Yury Norov <ynorov@nvidia.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot · 2026-04-30T22:03:17Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 140.70 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:24:58Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1299.48 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:57:13Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1933.22 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:57:40Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 25.74 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:58:09Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 27.03 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:58:12Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 1.73 seconds
Result: WARNING
Output:

WARNING: Reported-by: should be immediately followed by Closes: with a URL to the report
#51: 
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Yury Norov <ynorov@nvidia.com>

total: 0 errors, 1 warnings, 0 checks, 23 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 b5f7b74e0736 ("lib: include crc32.h conditionally on CONFIG_CRC32") 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, 23 lines checked
WARNING: Reported-by: should be immediately followed by Closes: with a URL to the report

linux-riscv-bot · 2026-04-30T22:59:41Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 87.31 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:59:43Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.25 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:59:45Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
kdoc
Desc: Detects for kdoc errors
Duration: 0.86 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:59:47Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
module-param
Desc: Detect module_param changes
Duration: 0.26 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:59:48Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T22:59:50Z

Patch 1: "[1/6] lib: include crc32.h conditionally on CONFIG_CRC32"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.32 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:02:27Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 140.36 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:21:35Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1146.12 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:49:51Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1695.01 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:50:19Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 25.98 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:50:47Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 27.15 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:50:50Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 1.42 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:52:18Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 86.94 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:52:20Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.26 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:52:22Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
kdoc
Desc: Detects for kdoc errors
Duration: 0.92 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:52:25Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
module-param
Desc: Detect module_param changes
Duration: 0.81 seconds
Result: PASS

linux-riscv-bot · 2026-04-30T23:52:27Z

Patch 2: "[2/6] lib/bitrev: Introduce GENERIC_BITREVERSE and cleanup Kconfig"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.85 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T01:53:47Z

Patch 4: "[4/6] arch/riscv: Add bitrev.h file to support rev8 and brev8"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.25 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T01:53:48Z

Patch 4: "[4/6] arch/riscv: Add bitrev.h file to support rev8 and brev8"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.32 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T01:56:22Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 139.63 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:15:07Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1123.92 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:43:01Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1672.26 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:43:28Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 25.74 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:43:57Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 27.09 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:44:00Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.92 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:45:30Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 88.61 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:45:32Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:45:34Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
kdoc
Desc: Detects for kdoc errors
Duration: 0.92 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:45:36Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
module-param
Desc: Detect module_param changes
Duration: 0.27 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:45:38Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:45:39Z

Patch 5: "[5/6] lib: compile generic bitrev.c conditionally on GENERIC_BITREVERSE"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.31 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T02:48:12Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 138.88 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:05:07Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1013.27 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:28:04Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1375.64 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:28:31Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 25.85 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:29:00Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 27.26 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:29:02Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.73 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:30:32Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 87.78 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:30:33Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:30:36Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
kdoc
Desc: Detects for kdoc errors
Duration: 0.97 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:30:38Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
module-param
Desc: Detect module_param changes
Duration: 0.33 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:30:39Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-05-01T03:30:41Z

Patch 6: "[6/6] MAINTAINERS: BITOPS: include bitrev.[ch]"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.31 seconds
Result: PASS

Linux RISC-V bot and others added 7 commits April 30, 2026 05:50

Adding CI files

94a07a2

MAINTAINERS: BITOPS: include bitrev.[ch]

dec05ea

Arch bitrev API is covered in MAINTAINERS under the BITOPS entry, while generic bitrev is unmaintained. Move it under BITOPS too. Signed-off-by: Yury Norov <ynorov@nvidia.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot force-pushed the workflow__riscv__fixes branch from 94a07a2 to f190ec6 Compare May 1, 2026 02:14

linux-riscv-bot force-pushed the workflow__riscv__fixes branch from f190ec6 to 2c3b264 Compare May 2, 2026 08:13

linux-riscv-bot closed this May 8, 2026

linux-riscv-bot deleted the pw1088339 branch May 8, 2026 02:14

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