diff options
| author | Bjoern A. Zeeb <bz@FreeBSD.org> | 2026-04-14 15:13:18 +0000 |
|---|---|---|
| committer | Bjoern A. Zeeb <bz@FreeBSD.org> | 2026-04-18 01:12:13 +0000 |
| commit | c72ac6af086962d236f4712761abacac0c62b48e (patch) | |
| tree | dc38fc73569012bf0f72ad38af488bfd8460bb52 | |
| parent | d2c85255d4fca37ec9774f85f867f8fc89a51269 (diff) | |
LinuxKPI: add kmalloc_obj[s], kzalloc_obj[s], and kzalloc_flex
Drivers in Linux v7.0 seem to have changed to the new allocation
macros using a sweep. Add the ones I encountered with wireless
drivers so far. They all take an optional argument for a gfp_t,
which default_gfp() deals with.
The plural version "objs" takes an extra nitems argument in addition
to the size. We use size_mul() to possibly detect overflows.
The "flex" version uses an extra variable to track the variable sized
array allocations and if supported by the compiler will use
__builtin_counted_by_ref() to properly track bounds.
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: dumbbell
Differential Revision: https://reviews.freebsd.org/D56395
| -rw-r--r-- | sys/compat/linuxkpi/common/include/linux/slab.h | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/slab.h b/sys/compat/linuxkpi/common/include/linux/slab.h index 0e649e1e3c4a..6c05c77819a5 100644 --- a/sys/compat/linuxkpi/common/include/linux/slab.h +++ b/sys/compat/linuxkpi/common/include/linux/slab.h @@ -4,7 +4,7 @@ * Copyright (c) 2010 Panasas, Inc. * Copyright (c) 2013-2021 Mellanox Technologies, Ltd. * All rights reserved. - * Copyright (c) 2024-2025 The FreeBSD Foundation + * Copyright (c) 2024-2026 The FreeBSD Foundation * * Portions of this software were developed by Björn Zeeb * under sponsorship from the FreeBSD Foundation. @@ -51,6 +51,22 @@ MALLOC_DECLARE(M_KMALLOC); #define kvcalloc(n, size, flags) kvmalloc_array(n, size, (flags) | __GFP_ZERO) #define kzalloc(size, flags) kmalloc(size, (flags) | __GFP_ZERO) #define kzalloc_node(size, flags, node) kmalloc_node(size, (flags) | __GFP_ZERO, node) +#define kzalloc_obj(_p, ...) \ + kzalloc(sizeof(typeof(_p)), default_gfp(__VA_ARGS__)) +#define kzalloc_objs(_p, _n, ...) \ + kzalloc(size_mul((_n), sizeof(typeof(_p))), default_gfp(__VA_ARGS__)) +#define kzalloc_flex(_p, _field, _n, ...) \ +({ \ + const size_t __n = (_n); \ + const size_t __psize = struct_size_t(typeof(_p), _field, __n); \ + typeof(_p) *__p_obj; \ + \ + __p_obj = kzalloc(__psize, default_gfp(__VA_ARGS__)); \ + if (__p_obj != NULL) \ + __set_flex_counter(__p_obj->_field, __n); \ + \ + __p_obj; \ +}) #define kfree_const(ptr) kfree(ptr) #define kfree_async(ptr) kfree(ptr) /* drm-kmod 5.4 compat */ #define vzalloc(size) __vmalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, 0) @@ -143,6 +159,12 @@ kmalloc_node(size_t size, gfp_t flags, int node) return (lkpi___kmalloc_node(size, flags, node)); } +#define kmalloc_obj(_p, ...) \ + kmalloc(sizeof(typeof(_p)), default_gfp(__VA_ARGS__)) + +#define kmalloc_objs(_p, _n, ...) \ + kmalloc(size_mul((_n) * sizeof(typeof(_p))), default_gfp(__VA_ARGS__)) + static inline void * krealloc(void *ptr, size_t size, gfp_t flags) { |