Date: Wed, 22 Apr 2026 21:08:07 +0000 From: Bjoern A. Zeeb <bz@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Cc: Jean-=?utf-8?Q?S=C3=A9bast?==?utf-8?Q?ien P=C3=A9?=dron <dumbbell@FreeBSD.org> Subject: git: b510eedf7e51 - stable/15 - linuxkpi: Add support for statically-allocated kfifo Message-ID: <69e938b7.26dc5.7c2155b3@gitrepo.freebsd.org>
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The branch stable/15 has been updated by bz: URL: https://cgit.FreeBSD.org/src/commit/?id=b510eedf7e512019ccac0f5f79e0cb7738dad40b commit b510eedf7e512019ccac0f5f79e0cb7738dad40b Author: Jean-Sébastien Pédron <dumbbell@FreeBSD.org> AuthorDate: 2025-09-07 08:37:27 +0000 Commit: Bjoern A. Zeeb <bz@FreeBSD.org> CommitDate: 2026-04-22 20:56:54 +0000 linuxkpi: Add support for statically-allocated kfifo The main difference with the dynamically allocated version is that the structure is initialized with `DECLARE_KFIFO()` which takes the number of items as an additional argument compared to `DECLARE_KFIFO_PTR()`. The declared structure is then initialized with `INIT_KFIFO()` which sets all fields to 0, except `total` which is computed from the size of the array passed to `DECLARE_KFIFO()`. The amdgpu DRM driver started to used this in Linux 6.10. Reviewed by: bz Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D54497 (cherry picked from commit 55bd09ae0fc437c9eb135952ac278540b7388add) --- sys/compat/linuxkpi/common/include/linux/kfifo.h | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/sys/compat/linuxkpi/common/include/linux/kfifo.h b/sys/compat/linuxkpi/common/include/linux/kfifo.h index b9f6ecacd3d1..b0d0c17f07e4 100644 --- a/sys/compat/linuxkpi/common/include/linux/kfifo.h +++ b/sys/compat/linuxkpi/common/include/linux/kfifo.h @@ -33,8 +33,26 @@ #include <linux/slab.h> #include <linux/gfp.h> -#define INIT_KFIFO(x) 0 -#define DECLARE_KFIFO(x, y, z) +/* + * INIT_KFIFO() is used to initialize the structure declared with + * DECLARE_KFIFO(). It doesn't work with DECLARE_KFIFO_PTR(). + */ +#define INIT_KFIFO(_kf) \ + ({ \ + (_kf).total = nitems((_kf).head); \ + (_kf).count = 0; \ + (_kf).first = 0; \ + (_kf).last = 0; \ + }) + +#define DECLARE_KFIFO(_name, _type, _size) \ + struct kfifo_ ## _name { \ + size_t total; \ + size_t count; \ + size_t first; \ + size_t last; \ + _type head[_size]; \ + } _name #define DECLARE_KFIFO_PTR(_name, _type) \ struct kfifo_ ## _name { \home | help
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