Changes in bitops.h

7e4a2b381dcb5b2bcaf528e010096fd2d14868b1 - LinuxKPI: improve hweight if complie time constant

Tue, 20 Jan 2026 23:41:12 +0100

LinuxKPI: improve hweight if complie time constantrtw89(4) uses a static_assert() with hweight calls. In order toavoid compile time errors, deal with the case when the arguments tohweight are complie time constant.Sponsored by: The FreeBSD FoundationMFC after: 3 daysReviewed by: emasteDifferential Revision: https://reviews.freebsd.org/D54806 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

6c0bcd15e4782ff2e23119a37396d693d09c695d - linuxkpi: Add `rol32()`

Wed, 07 Jan 2026 22:18:38 +0100

linuxkpi: Add `rol32()``rol64()` and `rol32()` are used by . The former wasadded previously, before was added. However the latterwas not, and it broke the build on armv7.Reported by: adrianReviewed by: adrian, rpokalaSponsored by: The FreeBSD FoundationDifferential Revision: https://reviews.freebsd.org/D54588 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

a9462e32fa75a9a1e3f49964bc42b5303e0dd092 - linuxkpi: Add `rol64()`

Mon, 08 Sep 2025 01:22:22 +0200

linuxkpi: Add `rol64()`This is used by added in a separate future commit.Reviewed by: bzSponsored by: The FreeBSD FoundationDifferential Revision: https://reviews.freebsd.org/D54499 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

34892a8e30055000352d9612ad985be550c82bea - LinuxKPI: bitcount fix builds with gcc and older llvm

Tue, 16 Sep 2025 01:52:13 +0200

LinuxKPI: bitcount fix builds with gcc and older llvmLLVM before 19 and gcc before 14 do not support __builtin_popcountg().Use __const_bitcount from sys/bitcount.h as a replacement in thesecases. This should still allow drm-kmod to build where the size needsto be known at compile-time.Remove the conditional for gcc around the iwlwifi modules build,which was collateral damage in all this.Sponsored by: The FreeBSD FoundationFixes: 7cbc4d875971, 5e0a4859f28aMFC after: 3 daysReviewed by: brooks, emaste (without the sys/modules/Makefile change)Differential Revision: https://reviews.freebsd.org/D54297 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

3e9ad70a30d93fc8bc759af7ec57aaa7e0b2d4f6 - linuxkpi: Fix the definition of BITS_PER_LONG

Wed, 22 Oct 2025 16:04:46 +0200

linuxkpi: Fix the definition of BITS_PER_LONGDon't use __LP64__ to decide the value, as it gives the wrong result onCHERI platforms. Just define it in terms of __SIZEOF_LONG__. Make asimilar adjustment for BITS_PER_LONG_LONG while here.Reviewed by: bz, dumbbell, emasteMFC after: 1 weekSponsored by: CHERI Research Centre (EPSRC grant UKRI3001)Differential Revision: https://reviews.freebsd.org/D53135 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

7cbc4d875971860d941cc15d7f42e6cfeffbfe66 - linuxkpi: Use `__builtin_popcountg()` instead of `bitcount*()`

Sun, 22 Jun 2025 11:59:01 +0200

linuxkpi: Use `__builtin_popcountg()` instead of `bitcount*()`The DRM drivers generic code started to use `HWEIGHT64()` in thedefinition of an array field in a structure. Therefore, the array sizeneeds to be known at compile time. This was not the case with the`HWEIGHT*()` macros based on `bitcount*()`. The use of`__builtin_popcountg()` solves that problem.Reviewed by: bzSponsored by: The FreeBSD FoundationDifferential Revision: https://reviews.freebsd.org/D50995 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

cdbff1b2999660b31b2de076d04670722a555ed2 - linuxkpi: Remove incorrect + 1 from HWEIGHT* macros

Tue, 24 Jun 2025 15:36:54 +0200

linuxkpi: Remove incorrect + 1 from HWEIGHT* macrosFixes: 4cc8a9da491d ("LinuxKPI: add HWEIGHT32()")Reviewed by: bzSponsored by: The FreeBSD FoundationDifferential Revision: https://reviews.freebsd.org/D51010 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

3fd7fd4974c8000148360af2f02002f1c083681a - linuxkpi: Add `__assign_bit()`

Fri, 27 Dec 2024 01:33:08 +0100

linuxkpi: Add `__assign_bit()`[Why]This function is used by the i915 DRM driver in Linux 6.7.Reviewed by: manuSponsored by: The FreeBSD FoundationDifferential Revision: https://reviews.freebsd.org/D48752 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

f674f016c03d49e14f1c651ed088a6f2d01a62ee - LinuxKPI: add BITS_TO_BYTES()

Wed, 03 Apr 2024 01:48:05 +0200

LinuxKPI: add BITS_TO_BYTES()Just like BITS_TO_LONG() ... used in rtw89.Sponsored by: The FreeBSD FoundationMFC after: 3 daysReviewed by: emasteDifferential Revision: https://reviews.freebsd.org/D44603 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

95ee2897e98f5d444f26ed2334cc7c439f9c16c6 - sys: Remove $FreeBSD$: two-line .h pattern

Wed, 16 Aug 2023 19:54:11 +0200

sys: Remove $FreeBSD$: two-line .h patternRemove /^\s*\*\n \*\s+\$FreeBSD\$$\n/ List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

d17b78aa142d7c63490c7a2c3f202ef99fffad70 - LinuxKPI: add __ffs64()

Wed, 09 Feb 2022 12:43:33 +0100

LinuxKPI: add __ffs64()Add __ffs64() to linux/bitops.h needed by a driver.Reviewed by: hselaskyMFC after: 3 daysDifferential Revision: https://reviews.freebsd.org/D34225 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

307f78f3ed90a4145eeb2c8cc79bc95b2666f57a - LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards

Sun, 19 Dec 2021 11:42:42 +0100

LinuxKPI: Constantly use _LINUXKPI_ prefix in include guardsMFC after: 1 weekReviewed by: bz, emaste, hselasky, manuDifferential Revision: https://reviews.freebsd.org/D33562 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

ea4dea83944ac6334d31e0364dd674eda250adde - LinuxKPI: add sign_extend32()

Thu, 01 Jul 2021 15:14:19 +0200

LinuxKPI: add sign_extend32()Add sign_extend32() replicating the 64 version. This is needed bythe rtw88 driver.MFC after: 10 daysReviewed by: imp, emaste, hselaskyDifferential Revision: https://reviews.freebsd.org/D30979 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

4cc8a9da491d10f1b4bad6a50730b67dd5e899c7 - LinuxKPI: add HWEIGHT32()

Thu, 27 May 2021 15:09:40 +0200

LinuxKPI: add HWEIGHT32()Add HWEIGHT32() macro needed by iwlwifi and while here add the 8/16/64variants likewise.Sponsored by: The FreeBSD FoundationMFC after: 12 daysReviewed by: hselaskyDifferential Revision: https://reviews.freebsd.org/D30501 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

a399cf139b5aedc5c7ce8811ea2f34268da7e8bd - Prefer using the MIN() function macro over the min() inline function

Mon, 07 Dec 2020 10:48:06 +0100

Prefer using the MIN() function macro over the min() inline functionin the LinuxKPI. Linux defines min() to be a macro, while in FreeBSDmin() is a static inline function clamping its arguments to"unsigned int".MFC after: 1 weekSponsored by: Mellanox Technologies // NVIDIA Networking List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

de6fc2e39bc1d88511b62ed3a6834a6f0cd6b3a4 - Merge ^/head r364082 through r364250.

Sat, 15 Aug 2020 13:49:31 +0200

Merge ^/head r364082 through r364250. List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

440cec3faf778469b36b998bb52aab7fbc43eae3 - MFH

Wed, 12 Aug 2020 19:16:26 +0200

MFHSponsored by: Rubicon Communications, LLC (netgate.com) List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

74d3a63559e0ab55db91e8a67171917a4f0fb3ea - Use atomic_clear_rel_long() to implement clear_bit_unlock() in the LinuxKPI

Tue, 11 Aug 2020 14:41:40 +0200

Use atomic_clear_rel_long() to implement clear_bit_unlock() in the LinuxKPIafter r363842.Suggested by: alc@MFC after: 1 weekSponsored by: Mellanox Technologies List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

e383ec74e572975ccda09be4c6bb028b50f6d2c6 - Merge ^/head r363739 through r363986.

Thu, 06 Aug 2020 21:34:55 +0200

Merge ^/head r363739 through r363986. List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h

334680ab074cae5c7fa78ebcb04a9765bbf4fcea - linuxkpi: Add clear_bit_unlock

Tue, 04 Aug 2020 17:25:22 +0200

linuxkpi: Add clear_bit_unlockThis calls clear_bit and adds a memory barrier.Sponsored by: The FreeBSD FoundationReviewed by: hselaskyMFC after: 1 weekDifferential Revision: https://reviews.freebsd.org/D25943 List of files: /freebsd/sys/compat/linuxkpi/common/include/linux/bitops.h