FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/slab.h

     /*-
      * Copyright (c) 2010 Isilon Systems, Inc.
      * Copyright (c) 2010 iX Systems, Inc.
      * Copyright (c) 2010 Panasas, Inc.
      * Copyright (c) 2013-2021 Mellanox Technologies, Ltd.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    #ifndef _LINUXKPI_LINUX_SLAB_H_
    #define _LINUXKPI_LINUX_SLAB_H_
    
    #include <sys/types.h>
    #include <sys/malloc.h>
    #include <sys/limits.h>
    
    #include <linux/compat.h>
    #include <linux/types.h>
    #include <linux/gfp.h>
    #include <linux/llist.h>
    #include <linux/overflow.h>
    
    MALLOC_DECLARE(M_KMALLOC);
    
    #define kvmalloc(size, flags)           kmalloc(size, flags)
    #define kvzalloc(size, flags)           kmalloc(size, (flags) | __GFP_ZERO)
    #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 kfree_const(ptr)                kfree(ptr)
    #define vzalloc(size)                   __vmalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, 0)
    #define vfree(arg)                      kfree(arg)
    #define kvfree(arg)                     kfree(arg)
    #define vmalloc_node(size, node)        __vmalloc_node(size, GFP_KERNEL, node)
    #define vmalloc_user(size)              __vmalloc(size, GFP_KERNEL | __GFP_ZERO, 0)
    #define vmalloc(size)                   __vmalloc(size, GFP_KERNEL, 0)
    #define __kmalloc(...)                  kmalloc(__VA_ARGS__)
    
    /*
     * Prefix some functions with linux_ to avoid namespace conflict
     * with the OpenSolaris code in the kernel.
     */
    #define kmem_cache              linux_kmem_cache
    #define kmem_cache_create(...)  linux_kmem_cache_create(__VA_ARGS__)
    #define kmem_cache_alloc(...)   lkpi_kmem_cache_alloc(__VA_ARGS__)
    #define kmem_cache_zalloc(...)  lkpi_kmem_cache_zalloc(__VA_ARGS__)
    #define kmem_cache_free(...)    lkpi_kmem_cache_free(__VA_ARGS__)
    #define kmem_cache_destroy(...) linux_kmem_cache_destroy(__VA_ARGS__)
    #define kmem_cache_shrink(x)    (0)
    
    #define KMEM_CACHE(__struct, flags)                                     \
            linux_kmem_cache_create(#__struct, sizeof(struct __struct),     \
            __alignof(struct __struct), (flags), NULL)
    
    typedef void linux_kmem_ctor_t (void *);
    
    struct linux_kmem_cache;
    
    #define SLAB_HWCACHE_ALIGN      (1 << 0)
    #define SLAB_TYPESAFE_BY_RCU    (1 << 1)
    #define SLAB_RECLAIM_ACCOUNT    (1 << 2)
    
    #define SLAB_DESTROY_BY_RCU \
            SLAB_TYPESAFE_BY_RCU
    
    #define ARCH_KMALLOC_MINALIGN \
            __alignof(unsigned long long)
    
    /* drm-kmod 5.4 compat */
    #define kfree_async(ptr)        kfree(ptr);
    
    #define ZERO_OR_NULL_PTR(x)     ((x) == NULL)
    
    static inline gfp_t
    linux_check_m_flags(gfp_t flags)
    {
            const gfp_t m = M_NOWAIT | M_WAITOK;
    
           /* make sure either M_NOWAIT or M_WAITOK is set */
           if ((flags & m) == 0)
                   flags |= M_NOWAIT;
           else if ((flags & m) == m)
                   flags &= ~M_WAITOK;
   
           /* mask away LinuxKPI specific flags */
           return (flags & GFP_NATIVE_MASK);
   }
   
   static inline void *
   kmalloc(size_t size, gfp_t flags)
   {
           return (malloc(MAX(size, sizeof(struct llist_node)), M_KMALLOC,
               linux_check_m_flags(flags)));
   }
   
   static inline void *
   kmalloc_node(size_t size, gfp_t flags, int node)
   {
           return (malloc_domainset(size, M_KMALLOC,
               linux_get_vm_domain_set(node), linux_check_m_flags(flags)));
   }
   
   static inline void *
   kcalloc(size_t n, size_t size, gfp_t flags)
   {
           flags |= __GFP_ZERO;
           return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
   }
   
   static inline void *
   kcalloc_node(size_t n, size_t size, gfp_t flags, int node)
   {
           flags |= __GFP_ZERO;
           return (mallocarray_domainset(n, size, M_KMALLOC,
               linux_get_vm_domain_set(node), linux_check_m_flags(flags)));
   }
   
   static inline void *
   __vmalloc(size_t size, gfp_t flags, int other)
   {
           return (malloc(size, M_KMALLOC, linux_check_m_flags(flags)));
   }
   
   static inline void *
   __vmalloc_node(size_t size, gfp_t flags, int node)
   {
           return (malloc_domainset(size, M_KMALLOC,
               linux_get_vm_domain_set(node), linux_check_m_flags(flags)));
   }
   
   static inline void *
   vmalloc_32(size_t size)
   {
           return (contigmalloc(size, M_KMALLOC, M_WAITOK, 0, UINT_MAX, 1, 1));
   }
   
   static inline void *
   kmalloc_array(size_t n, size_t size, gfp_t flags)
   {
           return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
   }
   
   static inline void *
   kmalloc_array_node(size_t n, size_t size, gfp_t flags, int node)
   {
           return (mallocarray_domainset(n, size, M_KMALLOC,
               linux_get_vm_domain_set(node), linux_check_m_flags(flags)));
   }
   
   static inline void *
   kvmalloc_array(size_t n, size_t size, gfp_t flags)
   {
           return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
   }
   
   static inline void *
   krealloc(void *ptr, size_t size, gfp_t flags)
   {
           return (realloc(ptr, size, M_KMALLOC, linux_check_m_flags(flags)));
   }
   
   static inline void *
   krealloc_array(void *ptr, size_t n, size_t size, gfp_t flags)
   {
           if (WOULD_OVERFLOW(n, size)) {
                   return NULL;
           }
   
           return (realloc(ptr, n * size, M_KMALLOC, linux_check_m_flags(flags)));
   }
   
   extern void linux_kfree_async(void *);
   
   static inline void
   kfree(const void *ptr)
   {
           if (curthread->td_critnest != 0)
                   linux_kfree_async(__DECONST(void *, ptr));
           else
                   free(__DECONST(void *, ptr), M_KMALLOC);
   }
   
   static __inline void
   kfree_sensitive(const void *ptr)
   {
           zfree(__DECONST(void *, ptr), M_KMALLOC);
   }
   
   static inline size_t
   ksize(const void *ptr)
   {
           return (malloc_usable_size(ptr));
   }
   
   extern struct linux_kmem_cache *linux_kmem_cache_create(const char *name,
       size_t size, size_t align, unsigned flags, linux_kmem_ctor_t *ctor);
   extern void *lkpi_kmem_cache_alloc(struct linux_kmem_cache *, gfp_t);
   extern void *lkpi_kmem_cache_zalloc(struct linux_kmem_cache *, gfp_t);
   extern void lkpi_kmem_cache_free(struct linux_kmem_cache *, void *);
   extern void linux_kmem_cache_destroy(struct linux_kmem_cache *);
   
   #endif                                  /* _LINUXKPI_LINUX_SLAB_H_ */

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