Re: [PATCH v4 15/19] lib/crc32: make crc32c() go directly to lib

[PATCH v4 00/19] Wire up CRC32 library functions to arch-optimized code · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 01/19] lib/crc32: drop leading underscores from __crc32c_le_base · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 02/19] lib/crc32: improve support for arch-specific overrides · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 04/19] crypto: crc32 - don't unnecessarily register arch algorithms · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 03/19] lib/crc32: expose whether the lib is really optimized at runtime · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 06/19] loongarch/crc32: expose CRC32 functions through lib · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 05/19] arm/crc32: expose CRC32 functions through lib · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 08/19] powerpc/crc32: expose CRC32 functions through lib · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 07/19] mips/crc32: expose CRC32 functions through lib · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 09/19] s390/crc32: expose CRC32 functions through lib · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 11/19] x86/crc32: update prototype for crc_pcl() · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 10/19] sparc/crc32: expose CRC32 functions through lib · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 12/19] x86/crc32: update prototype for crc32_pclmul_le_16() · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 13/19] x86/crc32: expose CRC32 functions through lib · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 14/19] bcachefs: Explicitly select CRYPTO from BCACHEFS_FS · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 15/19] lib/crc32: make crc32c() go directly to lib · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
Re: [PATCH v4 15/19] lib/crc32: make crc32c() go directly to lib · Askar Safin <hidden> · 2025-10-19
Re: [PATCH v4 15/19] lib/crc32: make crc32c() go directly to lib · Askar Safin <hidden> · 2025-10-19
Re: [PATCH v4 15/19] lib/crc32: make crc32c() go directly to lib · Eric Biggers <ebiggers@kernel.org> · 2025-10-19
[PATCH v4 16/19] ext4: switch to using the crc32c library · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 18/19] f2fs: switch to using the crc32 library · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 17/19] jbd2: switch to using the crc32c library · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
[PATCH v4 19/19] scsi: target: iscsi: switch to using the crc32c library · Eric Biggers <ebiggers@kernel.org> · 2024-12-02
Re: [PATCH v4 00/19] Wire up CRC32 library functions to arch-optimized code · Eric Biggers <ebiggers@kernel.org> · 2024-12-12
Re: [f2fs-dev] [PATCH v4 00/19] Wire up CRC32 library functions to arch-optimized code · patchwork-bot+f2fs@kernel.org · 2025-01-29

From: Askar Safin <hidden>
Date: 2025-10-19 08:11:02
Also in: linux-arch, linux-arm-kernel, linux-crypto, linux-ext4, linux-f2fs-devel, linux-mips, linux-riscv, linux-s390, linux-scsi, lkml, loongarch, sparclinux, stable

On Sun, Oct 19, 2025 at 9:09 AM Askar Safin [off-list ref] wrote:

Eric Biggers [off-list ref]:

quoted

Now that the lower level __crc32c_le() library function is optimized for

This patch (i. e. 38a9a5121c3b ("lib/crc32: make crc32c() go directly to lib"))
solves actual bug I found in practice. So, please, backport it
to stable kernels.

Oops. I just noticed that this patch removes module "libcrc32c".
And this breaks build for Debian kernel v6.12.48.
Previously I tested minimal build using "make localmodconfig".
Now I tried full build of Debian kernel using "dpkg-buildpackage".
And it failed, because some of Debian files reference "libcrc32c",
which is not available.

So, please, don't backport this patch to stable kernels.
I'm sorry.



-- 
Askar Safin

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