CRC updates for 6.17

The following changes since commit d0b3b7b22dfa1f4b515fd3a295b3fd958f9e81af:

Linux 6.16-rc4 (2025-06-29 13:09:04 -0700)

are available in the Git repository at:

https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git tags/crc-for-linus

for you to fetch changes up to 118da22eb6fbd48f896d17411f942399283d600c:

lib/crc: x86/crc32c: Enable VPCLMULQDQ optimization where beneficial (2025-07-20 20:52:34 -0700)

----------------------------------------------------------------

Updates for the kernel's CRC (cyclic redundancy check) code:

- Reorganize the architecture-optimized CRC code. It now lives in lib/crc/$(SRCARCH)/ rather than arch/$(SRCARCH)/lib/, and it is no longer artificially split into separate generic and arch modules. This allows better inlining and dead code elimination. The generic CRC code is also no longer exported, simplifying the API. (This mirrors the similar changes to SHA-1 and SHA-2 in lib/crypto/, which can be found in the "Crypto library updates" pull request.)

- Improve crc32c() performance on newer x86_64 CPUs on long messages by enabling the VPCLMULQDQ optimized code.

- Simplify the crypto_shash wrappers for crc32_le() and crc32c(). Register just one shash algorithm for each that uses the (fully optimized) library functions, instead of unnecessarily providing direct access to the generic CRC code.

- Remove unused and obsolete drivers for hardware CRC engines.

- Remove CRC-32 combination functions that are no longer used.

- Add kerneldoc for crc32_le(), crc32_be(), and crc32c().

- Convert the crc32() macro to an inline function.

----------------------------------------------------------------
Eric Biggers (26):
x86/crc: drop checks of CONFIG_AS_VPCLMULQDQ
crypto: testmgr - remove crc32c context format test
crypto: inside-secure - remove crc32 support
crypto: stm32 - remove crc32 and crc32c support
btrfs: stop parsing crc32c driver name
crypto/crc32[c]: register only "-lib" drivers
lib/crc32: Remove unused combination support
lib/crc: Move files into lib/crc/
lib/crc: Prepare for arch-optimized code in subdirs of lib/crc/ lib/crc: arm: Migrate optimized CRC code into lib/crc/
lib/crc: arm64: Migrate optimized CRC code into lib/crc/ lib/crc: loongarch: Migrate optimized CRC code into lib/crc/ lib/crc: mips: Migrate optimized CRC code into lib/crc/ lib/crc: powerpc: Migrate optimized CRC code into lib/crc/ lib/crc: riscv: Migrate optimized CRC code into lib/crc/ lib/crc: s390: Migrate optimized CRC code into lib/crc/ lib/crc: sparc: Migrate optimized CRC code into lib/crc/ lib/crc: x86: Migrate optimized CRC code into lib/crc/
lib/crc: Remove ARCH_HAS_* kconfig symbols
lib/crc: Explicitly include <linux/export.h>
lib/crc: crc32: Document crc32_le(), crc32_be(), and crc32c()
nvmem: layouts: Switch from crc32() to crc32_le()
lib/crc: crc32: Change crc32() from macro to inline function and remove cast lib/crc: crc64: Add include/linux/crc64.h to kernel-api.rst lib/crc: x86: Reorganize crc-pclmul static_call initialization lib/crc: x86/crc32c: Enable VPCLMULQDQ optimization where beneficial

 Documentation/core-api/kernel-api.rst              |  18 +-
 MAINTAINERS                                        |   4 +-
 arch/arm/Kconfig                                   |   2 -
 arch/arm/configs/multi_v7_defconfig                |   1 -
 arch/arm/lib/Makefile                              |   6 -
 arch/arm64/Kconfig                                 |   2 -
 arch/arm64/lib/Makefile                            |   6 -
 arch/loongarch/Kconfig                             |   1 -
 arch/loongarch/lib/Makefile                        |   2 -
 arch/mips/Kconfig                                  |   1 -
 arch/mips/lib/Makefile                             |   2 -
 arch/powerpc/Kconfig                               |   2 -
 arch/powerpc/lib/Makefile                          |   6 -
 arch/riscv/Kconfig                                 |   3 -
 arch/riscv/lib/Makefile                            |   6 -
 arch/s390/Kconfig                                  |   1 -
 arch/s390/lib/Makefile                             |   3 -
 arch/sparc/Kconfig                                 |   1 -
 arch/sparc/lib/Makefile                            |   2 -
 arch/x86/Kconfig                                   |   3 -
 arch/x86/lib/Makefile                              |  10 -
 arch/x86/lib/crc32.c                               | 111 -----
 crypto/Makefile                                    |   2 -
 crypto/crc32.c                                     |  65 +--
 crypto/crc32c.c                                    |  66 +--
 crypto/testmgr.c                                   |  57 +--
 drivers/crypto/inside-secure/safexcel.c            |   1 -
 drivers/crypto/inside-secure/safexcel.h            |   1 -
 drivers/crypto/inside-secure/safexcel_hash.c       |  92 +---
 drivers/crypto/stm32/Kconfig                       |   9 -
 drivers/crypto/stm32/Makefile                      |   1 -
 drivers/crypto/stm32/stm32-crc32.c                 | 480 ---------------------
 drivers/nvmem/layouts/u-boot-env.c                 |   2 +-
 fs/btrfs/disk-io.c                                 |   8 +-
 include/linux/crc-t10dif.h                         |  10 +-
 include/linux/crc32.h                              | 119 ++---
 include/linux/crc32poly.h                          |  16 +-
 include/linux/crc64.h                              |  22 +-
 lib/Kconfig                                        |  88 +---
 lib/Kconfig.debug                                  |  21 -
 lib/Makefile                                       |  32 +-
 lib/crc/.gitignore                                 |   5 +
 lib/crc/Kconfig                                    | 119 +++++
 lib/crc/Makefile                                   |  63 +++
 {arch/arm/lib => lib/crc/arm}/crc-t10dif-core.S    |   0
 .../lib/crc-t10dif.c => lib/crc/arm/crc-t10dif.h   |  23 +-
 {arch/arm/lib => lib/crc/arm}/crc32-core.S         |   0
 arch/arm/lib/crc32.c => lib/crc/arm/crc32.h        |  38 +-
 .../arm64/lib => lib/crc/arm64}/crc-t10dif-core.S  |   0
 .../lib/crc-t10dif.c => lib/crc/arm64/crc-t10dif.h |  22 +-
 {arch/arm64/lib => lib/crc/arm64}/crc32-core.S     |   0
 arch/arm64/lib/crc32.c => lib/crc/arm64/crc32.h    |  19 +-
 lib/{ => crc}/crc-ccitt.c                          |   8 +-
 lib/{ => crc}/crc-itu-t.c                          |   5 +-
 lib/{crc-t10dif.c => crc/crc-t10dif-main.c}        |  42 +-
 lib/{ => crc}/crc16.c                              |   5 +-
 lib/crc/crc32-main.c                               | 105 +++++
 lib/{ => crc}/crc4.c                               |   1 +
 lib/{crc64.c => crc/crc64-main.c}                  |  51 ++-
 lib/{ => crc}/crc7.c                               |   5 +-
 lib/{ => crc}/crc8.c                               |   3 +-
 lib/{ => crc}/gen_crc32table.c                     |   4 +-
 lib/{ => crc}/gen_crc64table.c                     |  11 +-
 .../crc32-loongarch.c => lib/crc/loongarch/crc32.h |  33 +-
 arch/mips/lib/crc32-mips.c => lib/crc/mips/crc32.h |  33 +-
 .../crc-t10dif.c => lib/crc/powerpc/crc-t10dif.h   |  20 +-
 .../lib => lib/crc/powerpc}/crc-vpmsum-template.S  |   0
 .../powerpc/lib/crc32.c => lib/crc/powerpc/crc32.h |  38 +-
 .../lib => lib/crc/powerpc}/crc32c-vpmsum_asm.S    |   0
 .../lib => lib/crc/powerpc}/crct10dif-vpmsum_asm.S |   0
 .../riscv/lib => lib/crc/riscv}/crc-clmul-consts.h |   0
 .../lib => lib/crc/riscv}/crc-clmul-template.h     |   0
 {arch/riscv/lib => lib/crc/riscv}/crc-clmul.h      |   0
 .../lib/crc-t10dif.c => lib/crc/riscv/crc-t10dif.h |   8 +-
 {arch/riscv/lib => lib/crc/riscv}/crc16_msb.c      |   0
 arch/riscv/lib/crc32.c => lib/crc/riscv/crc32.h    |  17 +-
 {arch/riscv/lib => lib/crc/riscv}/crc32_lsb.c      |   0
 {arch/riscv/lib => lib/crc/riscv}/crc32_msb.c      |   0
 arch/riscv/lib/crc64.c => lib/crc/riscv/crc64.h    |  11 +-
 {arch/riscv/lib => lib/crc/riscv}/crc64_lsb.c      |   0
 {arch/riscv/lib => lib/crc/riscv}/crc64_msb.c      |   0
 {arch/s390/lib => lib/crc/s390}/crc32-vx.h         |   0
 arch/s390/lib/crc32.c => lib/crc/s390/crc32.h      |  16 +-
 {arch/s390/lib => lib/crc/s390}/crc32be-vx.c       |   0
 {arch/s390/lib => lib/crc/s390}/crc32le-vx.c       |   0
 arch/sparc/lib/crc32.c => lib/crc/sparc/crc32.h    |  42 +-
 {arch/sparc/lib => lib/crc/sparc}/crc32c_asm.S     |   0
 lib/crc/tests/Makefile                             |   2 +
 lib/{ => crc}/tests/crc_kunit.c                    |  39 +-
 {arch/x86/lib => lib/crc/x86}/crc-pclmul-consts.h  |  47 +-
 .../x86/lib => lib/crc/x86}/crc-pclmul-template.S  |   7 -
 .../x86/lib => lib/crc/x86}/crc-pclmul-template.h  |  32 +-
 .../lib/crc-t10dif.c => lib/crc/x86/crc-t10dif.h   |  27 +-
 {arch/x86/lib => lib/crc/x86}/crc16-msb-pclmul.S   |   0
 {arch/x86/lib => lib/crc/x86}/crc32-pclmul.S       |   0
 lib/crc/x86/crc32.h                                | 137 ++++++
 {arch/x86/lib => lib/crc/x86}/crc32c-3way.S        |   0
 {arch/x86/lib => lib/crc/x86}/crc64-pclmul.S       |   0
 arch/x86/lib/crc64.c => lib/crc/x86/crc64.h        |  36 +-
 lib/crc32.c                                        | 126 ------
 lib/tests/Makefile                                 |   1 -
 101 files changed, 783 insertions(+), 1703 deletions(-)
 delete mode 100644 arch/x86/lib/crc32.c
 delete mode 100644 drivers/crypto/stm32/stm32-crc32.c
 create mode 100644 lib/crc/.gitignore
 create mode 100644 lib/crc/Kconfig
 create mode 100644 lib/crc/Makefile
 rename {arch/arm/lib => lib/crc/arm}/crc-t10dif-core.S (100%)
 rename arch/arm/lib/crc-t10dif.c => lib/crc/arm/crc-t10dif.h (70%)
 rename {arch/arm/lib => lib/crc/arm}/crc32-core.S (100%)
 rename arch/arm/lib/crc32.c => lib/crc/arm/crc32.h (69%)
 rename {arch/arm64/lib => lib/crc/arm64}/crc-t10dif-core.S (100%)
 rename arch/arm64/lib/crc-t10dif.c => lib/crc/arm64/crc-t10dif.h (70%)
 rename {arch/arm64/lib => lib/crc/arm64}/crc32-core.S (100%)
 rename arch/arm64/lib/crc32.c => lib/crc/arm64/crc32.h (81%)
 rename lib/{ => crc}/crc-ccitt.c (98%)
 rename lib/{ => crc}/crc-itu-t.c (99%)
 rename lib/{crc-t10dif.c => crc/crc-t10dif-main.c} (77%)
 rename lib/{ => crc}/crc16.c (99%)
 create mode 100644 lib/crc/crc32-main.c
 rename lib/{ => crc}/crc4.c (97%)
 rename lib/{crc64.c => crc/crc64-main.c} (66%)
 rename lib/{ => crc}/crc7.c (98%)
 rename lib/{ => crc}/crc8.c (98%)
 rename lib/{ => crc}/gen_crc32table.c (95%)
 rename lib/{ => crc}/gen_crc64table.c (81%)
 rename arch/loongarch/lib/crc32-loongarch.c => lib/crc/loongarch/crc32.h (71%)
 rename arch/mips/lib/crc32-mips.c => lib/crc/mips/crc32.h (82%)
 rename arch/powerpc/lib/crc-t10dif.c => lib/crc/powerpc/crc-t10dif.h (75%)
 rename {arch/powerpc/lib => lib/crc/powerpc}/crc-vpmsum-template.S (100%)
 rename arch/powerpc/lib/crc32.c => lib/crc/powerpc/crc32.h (64%)
 rename {arch/powerpc/lib => lib/crc/powerpc}/crc32c-vpmsum_asm.S (100%)
 rename {arch/powerpc/lib => lib/crc/powerpc}/crct10dif-vpmsum_asm.S (100%)
 rename {arch/riscv/lib => lib/crc/riscv}/crc-clmul-consts.h (100%)
 rename {arch/riscv/lib => lib/crc/riscv}/crc-clmul-template.h (100%)
 rename {arch/riscv/lib => lib/crc/riscv}/crc-clmul.h (100%)
 rename arch/riscv/lib/crc-t10dif.c => lib/crc/riscv/crc-t10dif.h (62%)
 rename {arch/riscv/lib => lib/crc/riscv}/crc16_msb.c (100%)
 rename arch/riscv/lib/crc32.c => lib/crc/riscv/crc32.h (66%)
 rename {arch/riscv/lib => lib/crc/riscv}/crc32_lsb.c (100%)
 rename {arch/riscv/lib => lib/crc/riscv}/crc32_msb.c (100%)
 rename arch/riscv/lib/crc64.c => lib/crc/riscv/crc64.h (65%)
 rename {arch/riscv/lib => lib/crc/riscv}/crc64_lsb.c (100%)
 rename {arch/riscv/lib => lib/crc/riscv}/crc64_msb.c (100%)
 rename {arch/s390/lib => lib/crc/s390}/crc32-vx.h (100%)
 rename arch/s390/lib/crc32.c => lib/crc/s390/crc32.h (81%)
 rename {arch/s390/lib => lib/crc/s390}/crc32be-vx.c (100%)
 rename {arch/s390/lib => lib/crc/s390}/crc32le-vx.c (100%)
 rename arch/sparc/lib/crc32.c => lib/crc/sparc/crc32.h (60%)
 rename {arch/sparc/lib => lib/crc/sparc}/crc32c_asm.S (100%)
 create mode 100644 lib/crc/tests/Makefile
 rename lib/{ => crc}/tests/crc_kunit.c (89%)
 rename {arch/x86/lib => lib/crc/x86}/crc-pclmul-consts.h (80%)
 rename {arch/x86/lib => lib/crc/x86}/crc-pclmul-template.S (98%)
 rename {arch/x86/lib => lib/crc/x86}/crc-pclmul-template.h (77%)
 rename arch/x86/lib/crc-t10dif.c => lib/crc/x86/crc-t10dif.h (52%)
 rename {arch/x86/lib => lib/crc/x86}/crc16-msb-pclmul.S (100%)
 rename {arch/x86/lib => lib/crc/x86}/crc32-pclmul.S (100%)
 create mode 100644 lib/crc/x86/crc32.h
 rename {arch/x86/lib => lib/crc/x86}/crc32c-3way.S (100%)
 rename {arch/x86/lib => lib/crc/x86}/crc64-pclmul.S (100%)
 rename arch/x86/lib/crc64.c => lib/crc/x86/crc64.h (53%)
 delete mode 100644 lib/crc32.c